Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e71448
C. Gómez-Carmona, D. García-Santos, David Mancha-Triguero, A. Antúnez, S. Ibáñez
Abstract The purpose of the present study was to analyze the sex-related differences in beach handball workload. A total sample of 105 handballers (male, n=50; female, n=55) belonging to six U’16 teams, seven U’18 teams and eight senior teams were monitored in the final round of 2018-2019 beach handball tournament celebrated during 3-days congested-fixture design. The external load variables Steps, Jumps, Player Load, Total Impacts (>2G) and Total Impacts per Intensities (very low, 2-4G; low, 4-6G; moderate, 6-8G; high, 8-10G; very high, >10G) through WIMUTM inertial devices. Statistical analysis was composed by t-test and Cohen’s d for anthropometrical variables and by MANOVA and omega partial square for sex and categories related differences. Greater values in male handballers were found in height, weight and age in each categories (U’16: p<0.05; d=0.50-2.26; U’18: p<0.05; d=0.95-2.21; senior: p<0.05; d=1.01-1.99), except in age in U’18 (p=0.97; d=0.01). Respect to external workload, differences were found related to category (p<0.01; ωp²= 0.02-0.05, small) and sex (p<0.01; ωp²= 0.04-0.21, small to high), except in Steps (p=0.47; ωp²= 0.00), finding the greatest sex-related differences in U’16 category. From the differences found in anthropometrical characteristics and external workload, their evaluation during competition allows designing specific training sessions with the purpose of sports performance enhancement in beach handball.
{"title":"Analysis of sex-related differences in external load demands on beach handball","authors":"C. Gómez-Carmona, D. García-Santos, David Mancha-Triguero, A. Antúnez, S. Ibáñez","doi":"10.1590/1980-0037.2020v22e71448","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e71448","url":null,"abstract":"Abstract The purpose of the present study was to analyze the sex-related differences in beach handball workload. A total sample of 105 handballers (male, n=50; female, n=55) belonging to six U’16 teams, seven U’18 teams and eight senior teams were monitored in the final round of 2018-2019 beach handball tournament celebrated during 3-days congested-fixture design. The external load variables Steps, Jumps, Player Load, Total Impacts (>2G) and Total Impacts per Intensities (very low, 2-4G; low, 4-6G; moderate, 6-8G; high, 8-10G; very high, >10G) through WIMUTM inertial devices. Statistical analysis was composed by t-test and Cohen’s d for anthropometrical variables and by MANOVA and omega partial square for sex and categories related differences. Greater values in male handballers were found in height, weight and age in each categories (U’16: p<0.05; d=0.50-2.26; U’18: p<0.05; d=0.95-2.21; senior: p<0.05; d=1.01-1.99), except in age in U’18 (p=0.97; d=0.01). Respect to external workload, differences were found related to category (p<0.01; ωp²= 0.02-0.05, small) and sex (p<0.01; ωp²= 0.04-0.21, small to high), except in Steps (p=0.47; ωp²= 0.00), finding the greatest sex-related differences in U’16 category. From the differences found in anthropometrical characteristics and external workload, their evaluation during competition allows designing specific training sessions with the purpose of sports performance enhancement in beach handball.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87021669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e66062
Mariam Mian Bouchnak, T. Ostolin, E. Sperandio, W. Vieira, V. Dourado
Abstract Although the determinant impact of exercise-induced muscle fatigue prior to postural balance assessment has been widely described, recent evidence suggests that hyperventilation and sensorimotor losses, rather than muscle fatigue, are responsible for the changes observed in postural balance. However, the association between localized muscle fatigue (LMF), induced by isokinetic dynamometer protocol test and assessed through surface electromyography, and postural balance in adults is poorly understood. We aimed to evaluate the association between the LMF of the rectus femoris and static postural balance in 51 adult men (43±14.8 years; 26.9±5 kg/m2). We obtained physical activity level and postural balance, respectively, through a triaxial accelerometry and a force platform. The quadriceps femoris strength and endurance were obtained using an isokinetic dynamometer and surface electromyography simultaneously. The association between the isokinetic and electromyographic LMF and static postural balance was investigated using linear regression models adjusted for age, body mass index, and isokinetic quadriceps strength and LMF. The correlations between postural balance variables and isokinetic muscle strength and LMF were weak-to-moderate. After multivariate analyses, we observed that electromyographic LMF were a predictor of postural balance, mainly of the mean amplitude and COP area and velocity in the mediolateral direction, regardless of isokinetic variables. Therefore, LMF plays a determinant role in the postural balance of physically active adult men. Fatigue indices are significant predictors of postural balance, regardless of previous fatigue induction.
尽管在体位平衡评估之前，运动引起的肌肉疲劳的决定性影响已经被广泛描述，但最近的证据表明，过度通气和感觉运动丧失，而不是肌肉疲劳，是体位平衡变化的原因。然而，在成人中，局部肌肉疲劳(由等速测功机方案试验诱导并通过表面肌电图评估)与姿势平衡之间的关系尚不清楚。我们旨在评估51名成年男性(43±14.8岁)股直肌LMF与静态姿势平衡之间的关系;26.9±5 kg / m2)。我们分别通过三轴加速度计和力平台获得身体活动水平和姿势平衡。同时使用等速测功仪和表面肌电图测量股四头肌的力量和耐力。采用线性回归模型对年龄、体重指数、等速股四头肌力量和LMF进行校正，研究等速和肌电图LMF与静态姿势平衡之间的关系。体位平衡变量与等速肌力和LMF之间的相关性为弱至中等。在多变量分析后，我们观察到肌电图LMF是姿势平衡的一个预测指标，主要是中外侧方向的平均振幅和COP面积和速度，而不考虑等速变量。因此，LMF在体力活动成年男性的姿势平衡中起决定性作用。疲劳指数是姿势平衡的重要预测因子，与先前的疲劳诱导无关。
{"title":"Association between electromyographic localized muscle fatigue of the rectus femoris and static postural balance in physically active adult men","authors":"Mariam Mian Bouchnak, T. Ostolin, E. Sperandio, W. Vieira, V. Dourado","doi":"10.1590/1980-0037.2020v22e66062","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e66062","url":null,"abstract":"Abstract Although the determinant impact of exercise-induced muscle fatigue prior to postural balance assessment has been widely described, recent evidence suggests that hyperventilation and sensorimotor losses, rather than muscle fatigue, are responsible for the changes observed in postural balance. However, the association between localized muscle fatigue (LMF), induced by isokinetic dynamometer protocol test and assessed through surface electromyography, and postural balance in adults is poorly understood. We aimed to evaluate the association between the LMF of the rectus femoris and static postural balance in 51 adult men (43±14.8 years; 26.9±5 kg/m2). We obtained physical activity level and postural balance, respectively, through a triaxial accelerometry and a force platform. The quadriceps femoris strength and endurance were obtained using an isokinetic dynamometer and surface electromyography simultaneously. The association between the isokinetic and electromyographic LMF and static postural balance was investigated using linear regression models adjusted for age, body mass index, and isokinetic quadriceps strength and LMF. The correlations between postural balance variables and isokinetic muscle strength and LMF were weak-to-moderate. After multivariate analyses, we observed that electromyographic LMF were a predictor of postural balance, mainly of the mean amplitude and COP area and velocity in the mediolateral direction, regardless of isokinetic variables. Therefore, LMF plays a determinant role in the postural balance of physically active adult men. Fatigue indices are significant predictors of postural balance, regardless of previous fatigue induction.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81672692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e72397
P. Santos, L. R. Lima, B. Costa, C. R. Martins, Giseli Minatto, Juliane Berria, E. Nunes, É. Petroski, K. Silva
Abstract The association of moderate to vigorous physical activity and sedentary behavior performed in the school context with cardiovascular risk factors is unclear. Thus, the purpose of this study was to evaluate whether MVPA and SB during school time are associated with single and clustered cardiovascular risk factors in 10- to 16-year-old school students. This study used the baseline data from a non-randomized controlled clinical trial (“MEXA-SE”) conducted on 6th to 9th-grade students from schools in Florianopolis, Brazil. Skinfolds, resting blood pressure, 20-m shuttle-run test, fasting glucose, triglycerides, total cholesterol, high-density lipoprotein cholesterol, and white blood cell counts were obtained. MVPA and SB were objectively measured with accelerometers. A minimum of 180 minutes was considered valid school-time for analysis. Multiple linear regression adjusted for age, sex and habitual physical activity was used. School-time MVPA was positively associated with the peak VO2 (β = 0.17 ml.kg.min-1), and inversely associated with sum of four skinfolds (β = -0.96 mm), diastolic blood pressure (β = -0.36 mmHg), systolic blood pressure (β = -0.301 mmHg); triglycerides (β = -1.49 mg.dL-1), and clustered cardiovascular risk factors (β = -0.123). School-time SB was positively associated with clustered cardiovascular risk factors (β = 0.033). In conclusion, independently of habitual physical activity level, school-time MVPA and a lower time in SB were associated to single and clustered cardiovascular risk factors. Thus, the promotion of strategies aimed increase MVPA and reduce SB at school may prevent the onset and early accumulation of cardiovascular risk factors in adolescence.
{"title":"Association of physical activity and sedentary behavior at school with cardiovascular risk factors in adolescents","authors":"P. Santos, L. R. Lima, B. Costa, C. R. Martins, Giseli Minatto, Juliane Berria, E. Nunes, É. Petroski, K. Silva","doi":"10.1590/1980-0037.2020v22e72397","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e72397","url":null,"abstract":"Abstract The association of moderate to vigorous physical activity and sedentary behavior performed in the school context with cardiovascular risk factors is unclear. Thus, the purpose of this study was to evaluate whether MVPA and SB during school time are associated with single and clustered cardiovascular risk factors in 10- to 16-year-old school students. This study used the baseline data from a non-randomized controlled clinical trial (“MEXA-SE”) conducted on 6th to 9th-grade students from schools in Florianopolis, Brazil. Skinfolds, resting blood pressure, 20-m shuttle-run test, fasting glucose, triglycerides, total cholesterol, high-density lipoprotein cholesterol, and white blood cell counts were obtained. MVPA and SB were objectively measured with accelerometers. A minimum of 180 minutes was considered valid school-time for analysis. Multiple linear regression adjusted for age, sex and habitual physical activity was used. School-time MVPA was positively associated with the peak VO2 (β = 0.17 ml.kg.min-1), and inversely associated with sum of four skinfolds (β = -0.96 mm), diastolic blood pressure (β = -0.36 mmHg), systolic blood pressure (β = -0.301 mmHg); triglycerides (β = -1.49 mg.dL-1), and clustered cardiovascular risk factors (β = -0.123). School-time SB was positively associated with clustered cardiovascular risk factors (β = 0.033). In conclusion, independently of habitual physical activity level, school-time MVPA and a lower time in SB were associated to single and clustered cardiovascular risk factors. Thus, the promotion of strategies aimed increase MVPA and reduce SB at school may prevent the onset and early accumulation of cardiovascular risk factors in adolescence.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88967200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e71432
G. A. D. Arruda, D. Coledam, F. Cantieri, M. V. Barros, D. Silva, A. Albuquerque, Clara Maria Silvestre Monteiro de Freitas, A. R. Oliveira
The aim of this work was to describe the methodological procedures of a longitudinal study on adolescent health, as well as to characterize the sample profile. This research enrolled a sample of 302 adolescents from Londrina - Parana. Two data collections were carried out with an interval of three years. Anthropometric indicators, blood pressure, heart rate, back pain, academic achievement, physical activity, sedentary behavior, eating habits, alcohol consumption, smoking, socioeconomic status, and motor tests were collected. There was a frequency of high blood pressure of 10.4%; body mass index in conditions associated with health risk of 22.4%; and spinal pain with moderate intensity of 22.1%. Sport and/or physical exercise practice (moderate-to-vigorous; ≥150 minutes/week) was 33.1%. High consumption of unhealthy foods and beverages ranged from 21.2% (coffee or tea) to 58.0% (fried foods). A high proportion (87.1%) reported never having smoked. The grades frequency ≥ seven varied between 21.4% (Biology) and 71.1% (Physical Education). Only 33.2% presented high academic achievement. The highest compliance with criteria was in the curl-up (76.4%) and the lowest in the 90o push-up (37.2%). This work will make it possible to verify the tracking of different behavioral and biological indicators related to health, as well as academic achievement. It will also allow the identification of the association between health outcomes and exposure factors prospectively, considering the influence of potential confounding variables. This information could contribute to the planning of public health interventions and policies.
{"title":"Longitudinal study of associated factors with adolescent health: Method and sample profile","authors":"G. A. D. Arruda, D. Coledam, F. Cantieri, M. V. Barros, D. Silva, A. Albuquerque, Clara Maria Silvestre Monteiro de Freitas, A. R. Oliveira","doi":"10.1590/1980-0037.2020v22e71432","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e71432","url":null,"abstract":"The aim of this work was to describe the methodological procedures of a longitudinal study on adolescent health, as well as to characterize the sample profile. This research enrolled a sample of 302 adolescents from Londrina - Parana. Two data collections were carried out with an interval of three years. Anthropometric indicators, blood pressure, heart rate, back pain, academic achievement, physical activity, sedentary behavior, eating habits, alcohol consumption, smoking, socioeconomic status, and motor tests were collected. There was a frequency of high blood pressure of 10.4%; body mass index in conditions associated with health risk of 22.4%; and spinal pain with moderate intensity of 22.1%. Sport and/or physical exercise practice (moderate-to-vigorous; ≥150 minutes/week) was 33.1%. High consumption of unhealthy foods and beverages ranged from 21.2% (coffee or tea) to 58.0% (fried foods). A high proportion (87.1%) reported never having smoked. The grades frequency ≥ seven varied between 21.4% (Biology) and 71.1% (Physical Education). Only 33.2% presented high academic achievement. The highest compliance with criteria was in the curl-up (76.4%) and the lowest in the 90o push-up (37.2%). This work will make it possible to verify the tracking of different behavioral and biological indicators related to health, as well as academic achievement. It will also allow the identification of the association between health outcomes and exposure factors prospectively, considering the influence of potential confounding variables. This information could contribute to the planning of public health interventions and policies.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67276309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e67085
A. Ferraz, H. D. B. Fontana, M. P. Castro, Caroline Ruschel, Carlos Alberto Atherinos Pierri, Hélio Roesler
Abstract This systematic review (PROSPERO registration n.43640) aimed to summarise and determine the quality of evidence relating hip bone morphology to (i) hip strength, (ii) mobility and (iii) lower limb biomechanics during functional activities. A standardized search on MEDLINE/PubMed, Web of Science, ScienceDirect and Scopus resulted in 17 papers that met inclusion criteria: i) original investigations with a minimal sample of n=10, ii) studies on humans and iii) presence of at least one quantitative hip morphological parameter and one hip functional (i.e. strength and mobility) and/or one lower limb biomechanical parameter. Risk of bias was assessed using the Quality Assessment of Diagnostic Accuracy Studies tool with adaptations. Sixteen out of the 17 included studies showed high risk of bias. We observed that primary evidence pointed to the influence of hip morphology on hip mobility in the transverse plane. Specifically, positive correlations between femoral anteversion angle and range of internal hip rotation in physical examination were observed. Regarding biomechanical parameters, no clear evidence of association between hip morphology, and kinematic and kinetic parameters were found. Our results point to a field that is currently under explored and future studies with low risk of bias addressing these relationships are required.
本系统综述(PROSPERO注册号43640)旨在总结和确定髋骨形态与(i)髋关节力量、(ii)活动能力和(iii)功能活动期间下肢生物力学相关的证据质量。在MEDLINE/PubMed、Web of Science、ScienceDirect和Scopus上进行标准化检索，得到17篇符合纳入标准的论文:i)最小样本量为n=10的原始调查，ii)人体研究，iii)至少存在一个定量髋关节形态参数和一个髋关节功能参数(即强度和活动性)和/或一个下肢生物力学参数。使用诊断准确性研究的质量评估工具和适应性来评估偏倚风险。17项纳入的研究中有16项显示出高偏倚风险。我们观察到，主要证据指向髋关节形态对髋关节横向活动的影响。具体而言，在体检中观察到股骨前倾角与髋关节内旋范围呈正相关。关于生物力学参数，没有明确的证据表明髋关节形态与运动学和动力学参数之间存在关联。我们的结果指出了一个目前正在探索的领域，未来需要低偏倚风险的研究来解决这些关系。
{"title":"Hip morphology and its relationship with hip strength, mobility and lower limb biomechanics: a systematic review in adults","authors":"A. Ferraz, H. D. B. Fontana, M. P. Castro, Caroline Ruschel, Carlos Alberto Atherinos Pierri, Hélio Roesler","doi":"10.1590/1980-0037.2020v22e67085","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e67085","url":null,"abstract":"Abstract This systematic review (PROSPERO registration n.43640) aimed to summarise and determine the quality of evidence relating hip bone morphology to (i) hip strength, (ii) mobility and (iii) lower limb biomechanics during functional activities. A standardized search on MEDLINE/PubMed, Web of Science, ScienceDirect and Scopus resulted in 17 papers that met inclusion criteria: i) original investigations with a minimal sample of n=10, ii) studies on humans and iii) presence of at least one quantitative hip morphological parameter and one hip functional (i.e. strength and mobility) and/or one lower limb biomechanical parameter. Risk of bias was assessed using the Quality Assessment of Diagnostic Accuracy Studies tool with adaptations. Sixteen out of the 17 included studies showed high risk of bias. We observed that primary evidence pointed to the influence of hip morphology on hip mobility in the transverse plane. Specifically, positive correlations between femoral anteversion angle and range of internal hip rotation in physical examination were observed. Regarding biomechanical parameters, no clear evidence of association between hip morphology, and kinematic and kinetic parameters were found. Our results point to a field that is currently under explored and future studies with low risk of bias addressing these relationships are required.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79170253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e62893
Tércio Apolinário-Souza, Herbert Ugrinowitsch, C. E. Campos, L. T. Lacerda, F. D. Tourino, L. Figueiredo, G. Lage
Abstract The purpose of the present study was to examine whether there would be performance differences between external and internal focus of attention conditions and an online demonstration condition, and if these differences would be observed at a neuromuscular level through EMG analysis, in addition to traditional outcome measures. We hypothesized that under the demonstration condition participants would perform better than under external and internal focus conditions. We also hypothesized that demonstration condition would show smaller EMG activity than external and internal focus conditions. Furthermore, we hope to replicate the benefits of external focus in relation to internal focus, both in outcome and product measures. Six male participants performed a bilateral leg extension under internal focus of attention, external focus of attention and online demonstration conditions. Muscular contractions goal times were set for concentric muscle action (4 seconds) and eccentric muscle action (2 seconds). An electrogoniometer was used to record muscular activation (production measures), and temporal error was used to observe performance (outcome measures). Results showed that online demonstration condition obtained better performance than external focus condition and a reduced muscular activation. However, differences between internal focus and the other experimental conditions were not found. These findings advance in the understanding mechanisms underpining the focus of attention, such as proposed by Constrained Action Hypothesis.
{"title":"Focus of attention and online demonstration effects on temporal error and muscle activation","authors":"Tércio Apolinário-Souza, Herbert Ugrinowitsch, C. E. Campos, L. T. Lacerda, F. D. Tourino, L. Figueiredo, G. Lage","doi":"10.1590/1980-0037.2020v22e62893","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e62893","url":null,"abstract":"Abstract The purpose of the present study was to examine whether there would be performance differences between external and internal focus of attention conditions and an online demonstration condition, and if these differences would be observed at a neuromuscular level through EMG analysis, in addition to traditional outcome measures. We hypothesized that under the demonstration condition participants would perform better than under external and internal focus conditions. We also hypothesized that demonstration condition would show smaller EMG activity than external and internal focus conditions. Furthermore, we hope to replicate the benefits of external focus in relation to internal focus, both in outcome and product measures. Six male participants performed a bilateral leg extension under internal focus of attention, external focus of attention and online demonstration conditions. Muscular contractions goal times were set for concentric muscle action (4 seconds) and eccentric muscle action (2 seconds). An electrogoniometer was used to record muscular activation (production measures), and temporal error was used to observe performance (outcome measures). Results showed that online demonstration condition obtained better performance than external focus condition and a reduced muscular activation. However, differences between internal focus and the other experimental conditions were not found. These findings advance in the understanding mechanisms underpining the focus of attention, such as proposed by Constrained Action Hypothesis.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"109 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72887719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e72597
Matheus Dantas, V. Queiros, F. Fonseca, P. Almeida-Neto, Rômulo Vasconcelos Teixeira, L. A. D. Silva, F. Aidar, D. Matos, Breno G. Cabral
Abstract Maturation interferes with physiological and mechanical aspects of muscle contraction. The aim of the present study was to compare the efficiency of the stretch-shortening cycle (SSC) between different maturation stages. One hundred forty six young people, with 72 boys and 74 girls, were recruited to participate in the study. Sexual maturation was measured and the group was stratified into adolescents (> 3 auto-tanner) and children (<2 auto-tanner). Squat jump (SJ) and countermovement jump (CMJ) performance were measured to measure reactive force (RF) capacity, eccentric utilization ratio (EUR) and pre-stretch augmentation (PSAP). The children did not present statistical difference between SJ and CMJ (t(55)= -1.93; ∆ = -0.61; 95% CI = -1.24 to -0.02; p = 0.058), while the adolescents presented higher performance of CMJ (t(89)= -12.28; ∆ = -2.44; 95% CI = -2.84 to -2.05; p <0.001). In addition, adolescents had higher RF performance (t(144)= 5.18; p <0.0001; 95% CI = 2.53 to 1.13), PSAP (t(144)= 4.38; p <0.0001; 95% CI = 14.00 to 5.29) and EUR (t(144)= 4.38; p <0.0001; 95% CI = 0.14 to 0.05). We conclude that more mature young people have better SSC utilization.
成熟会干扰肌肉收缩的生理和机械方面。本研究的目的是比较不同成熟阶段的拉伸-缩短周期(SSC)的效率。146名年轻人，包括72名男孩和74名女孩，被招募参加了这项研究。测定性成熟程度，并将组分为青少年(> 3次自动晒黑)和儿童(<2次自动晒黑)。采用深蹲跳(SJ)和反动作跳(CMJ)两种运动方式，测定各组动物的反作用力(RF)容量、偏心利用率(EUR)和预拉伸增强(PSAP)。SJ患儿与CMJ患儿无统计学差异(t(55)= -1.93;∆= -0.61;95% CI = -1.24 ~ -0.02;p = 0.058)，而青少年的CMJ表现较高(t(89)= -12.28;∆= -2.44;95% CI = -2.84 ~ -2.05;p < 0.001)。此外，青少年有更高的射频性能(t(144)= 5.18;p < 0.0001;95% CI = 2.53 ~ 1.13)， PSAP (t(144)= 4.38;p < 0.0001;95% CI = 14.00 ~ 5.29)和EUR (t(144)= 4.38;p < 0.0001;95% CI = 0.14 ~ 0.05)。我们认为，越成熟的年轻人对SSC的利用越好。
{"title":"The stretch-shortening cycle efficiency is dependent on the maturational stage","authors":"Matheus Dantas, V. Queiros, F. Fonseca, P. Almeida-Neto, Rômulo Vasconcelos Teixeira, L. A. D. Silva, F. Aidar, D. Matos, Breno G. Cabral","doi":"10.1590/1980-0037.2020v22e72597","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e72597","url":null,"abstract":"Abstract Maturation interferes with physiological and mechanical aspects of muscle contraction. The aim of the present study was to compare the efficiency of the stretch-shortening cycle (SSC) between different maturation stages. One hundred forty six young people, with 72 boys and 74 girls, were recruited to participate in the study. Sexual maturation was measured and the group was stratified into adolescents (> 3 auto-tanner) and children (<2 auto-tanner). Squat jump (SJ) and countermovement jump (CMJ) performance were measured to measure reactive force (RF) capacity, eccentric utilization ratio (EUR) and pre-stretch augmentation (PSAP). The children did not present statistical difference between SJ and CMJ (t(55)= -1.93; ∆ = -0.61; 95% CI = -1.24 to -0.02; p = 0.058), while the adolescents presented higher performance of CMJ (t(89)= -12.28; ∆ = -2.44; 95% CI = -2.84 to -2.05; p <0.001). In addition, adolescents had higher RF performance (t(144)= 5.18; p <0.0001; 95% CI = 2.53 to 1.13), PSAP (t(144)= 4.38; p <0.0001; 95% CI = 14.00 to 5.29) and EUR (t(144)= 4.38; p <0.0001; 95% CI = 0.14 to 0.05). We conclude that more mature young people have better SSC utilization.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83897955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e72376
Schelyne Ribas, L. Aburachid, J. C. Morales, Gabriella Nelli Monteiro, G. Praça, H. Castro, P. Greco
Abstract The main objective of this study was to establish content validity evidences in the Motor Coordination Test with Ball (MCTB). Four Ph.D. professors and former sports coaches with academic experience in the motor coordination area took part of the validation process as experts. The experts assessed four motor tasks and graded using the Likert scale from one to five for criteria of clarity of language, practice relevance, and theoretical relevance. The content validity coefficient (CVC) has been used to determine the CVCc of each task and the CVCt for the instrument as a whole, adopting as a cutoff CVCc .70 and CVCt .80. The results showed good agreement among experts concerning “clarity of language” (CVC= .89), “practice relevance” (CVC= .81), and theoretical relevance (CVC= .86). For “practice relevance” of images and videos of task execution, there has been observed CVCt of .86 and CVCt of .95, respectively. When requested the order of relevance of coordination pressures, the agreement among experts presented the existence of at least four coordination pressures in each one of the tasks and, out of these, at least two had a higher relevance. After the calculation of the CVC, ecological validity was determined for the MCTB, accrediting it as an instrument for the assessment of motor coordination with ball in the context of sports games.
{"title":"Content validity evidences in the motor coordination test with ball","authors":"Schelyne Ribas, L. Aburachid, J. C. Morales, Gabriella Nelli Monteiro, G. Praça, H. Castro, P. Greco","doi":"10.1590/1980-0037.2020v22e72376","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e72376","url":null,"abstract":"Abstract The main objective of this study was to establish content validity evidences in the Motor Coordination Test with Ball (MCTB). Four Ph.D. professors and former sports coaches with academic experience in the motor coordination area took part of the validation process as experts. The experts assessed four motor tasks and graded using the Likert scale from one to five for criteria of clarity of language, practice relevance, and theoretical relevance. The content validity coefficient (CVC) has been used to determine the CVCc of each task and the CVCt for the instrument as a whole, adopting as a cutoff CVCc .70 and CVCt .80. The results showed good agreement among experts concerning “clarity of language” (CVC= .89), “practice relevance” (CVC= .81), and theoretical relevance (CVC= .86). For “practice relevance” of images and videos of task execution, there has been observed CVCt of .86 and CVCt of .95, respectively. When requested the order of relevance of coordination pressures, the agreement among experts presented the existence of at least four coordination pressures in each one of the tasks and, out of these, at least two had a higher relevance. After the calculation of the CVC, ecological validity was determined for the MCTB, accrediting it as an instrument for the assessment of motor coordination with ball in the context of sports games.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82715447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e74688
G. Praça, A. Andrade, S. Bredt, Pedro Emílio Drumond Moreira, G. Costa, H. Castro, R. Aquino
Abstract This study aimed to compare the width, the length, the length per width ratio, and the stretch index between the first and the second halves in official soccer matches, and to compare the spatial exploration index between players from different positions. Seventeen professional soccer players from a Brazilian club participated in the study and were monitored during six official matches by a GPS device. Collective positional data were compared between the two halves using a paired t-test, while the spatial exploration index was compared between the playing positions and within the halves by a mixed two-way ANOVA. The results revealed no differences between the two halves for the collective variables. The highest values of spatial exploration index were reported for central midfielders and wing forwards. We conclude that the tactical behavior of professional soccer players is position-dependent, and midfielders are the most exploratory players on the pitch.
{"title":"Effects of match period and playing position on the individual and collective dynamics in professional soccer: a case study","authors":"G. Praça, A. Andrade, S. Bredt, Pedro Emílio Drumond Moreira, G. Costa, H. Castro, R. Aquino","doi":"10.1590/1980-0037.2020v22e74688","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e74688","url":null,"abstract":"Abstract This study aimed to compare the width, the length, the length per width ratio, and the stretch index between the first and the second halves in official soccer matches, and to compare the spatial exploration index between players from different positions. Seventeen professional soccer players from a Brazilian club participated in the study and were monitored during six official matches by a GPS device. Collective positional data were compared between the two halves using a paired t-test, while the spatial exploration index was compared between the playing positions and within the halves by a mixed two-way ANOVA. The results revealed no differences between the two halves for the collective variables. The highest values of spatial exploration index were reported for central midfielders and wing forwards. We conclude that the tactical behavior of professional soccer players is position-dependent, and midfielders are the most exploratory players on the pitch.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"313 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82168317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-10DOI: 10.1590/1980-0037.2020v22e72276
T. O. Borges, A. Moreira, R. Bacurau, F. Magalhães, C. Capitani, Alexandre Nunes Martins, L. Mochizuki, M. Aoki
Abstract The understanding of fatigue development during Archery competition would guide sports scientists, coaches and athletes on how to optimize the training routines of athletes from different competitive levels. This study investigated the effect of expertise level on physiological responses, during simulated archery competition (double-round 70m, 12 series, 6 arrows for an elite Brazilian Archer (EA) and a Novice Archer (NA). Ratings of perceived exertion, blood lactate and glucose, handgrip strength and electromyography were registered at the beginning, after each set from the 2nd to the 12tharrow and, 30-min after the competition simulation. The EA showed a greater handgrip strength for both arms, a constant lower mean RMS value (Baseline 0.279V and 12th set 0.221V, -20.7%), and a stable MF value throughout the competition (Baseline 146Hz to 12th set 140Hz). The NA showed a smaller handgrip strength, an increase in RMS after the 6th set towards the end of the competition (Baseline 0.387V, 6th 0.576V, and 12th set 0.720V, +46.2%) and a minor decrease in MF from the 6th to the end of 12th set (2nd set 122Hz, 4th set 127Hz, 6th set 112Hz and 12th set 117Hz, - 4.1%). In summary, all the fatigue-related markers showed a mild response to the Archery competition simulation, although a greater magnitude was observed in the NA, compared to the EA. This study reported the physiologic demands of an Archery simulated competition, in an official format, allowing coaches and sport scientists to draw more confident decisions on competition strategy and training design.
{"title":"Physiological demands of archery: effect of experience level","authors":"T. O. Borges, A. Moreira, R. Bacurau, F. Magalhães, C. Capitani, Alexandre Nunes Martins, L. Mochizuki, M. Aoki","doi":"10.1590/1980-0037.2020v22e72276","DOIUrl":"https://doi.org/10.1590/1980-0037.2020v22e72276","url":null,"abstract":"Abstract The understanding of fatigue development during Archery competition would guide sports scientists, coaches and athletes on how to optimize the training routines of athletes from different competitive levels. This study investigated the effect of expertise level on physiological responses, during simulated archery competition (double-round 70m, 12 series, 6 arrows for an elite Brazilian Archer (EA) and a Novice Archer (NA). Ratings of perceived exertion, blood lactate and glucose, handgrip strength and electromyography were registered at the beginning, after each set from the 2nd to the 12tharrow and, 30-min after the competition simulation. The EA showed a greater handgrip strength for both arms, a constant lower mean RMS value (Baseline 0.279V and 12th set 0.221V, -20.7%), and a stable MF value throughout the competition (Baseline 146Hz to 12th set 140Hz). The NA showed a smaller handgrip strength, an increase in RMS after the 6th set towards the end of the competition (Baseline 0.387V, 6th 0.576V, and 12th set 0.720V, +46.2%) and a minor decrease in MF from the 6th to the end of 12th set (2nd set 122Hz, 4th set 127Hz, 6th set 112Hz and 12th set 117Hz, - 4.1%). In summary, all the fatigue-related markers showed a mild response to the Archery competition simulation, although a greater magnitude was observed in the NA, compared to the EA. This study reported the physiologic demands of an Archery simulated competition, in an official format, allowing coaches and sport scientists to draw more confident decisions on competition strategy and training design.","PeriodicalId":38989,"journal":{"name":"Revista Brasileira de Cineantropometria e Desempenho Humano","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83523460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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