Pub Date : 2020-12-31DOI: 10.12697/AKUT.2020.26.04
Tarmo Riitmuru, J. Sokk
The aim of the study was to find the occurrence of musculoskeletal injuries in Estonia professional ballet dancers in the 2019/2020 season. A total of 62 dancers participated in the study, 25 were male and 37 female dancers. This study was a questionnaire-based, which was compiled on similar studies to collect the data among ballet dancers working in Estonia. The study showed that 58% of dancers were injured in the last 12 months. The most common type of dance injury during this period was muscle or tendon strain (33%), followed chronic inflammation (21%) and ankle sprain (20%). The most common injured body site was foot (20%), ankle (18%) and knee joint (10%). The highest number of injuries occurred during rehearsals (44%), classical class (27%), and during performances (16%). More than half of Estonian ballet dancers sustained at least one injury during the last twelve months. The most common types of injury were muscle or tendon strain, chronic inflammation and ankle sprain. The highest number of injuries occurred in the foot, whereas the highest number of injuries occurred during rehearsals.
{"title":"Injuries in Estonian professional ballet dancers in the 2019/2020 season","authors":"Tarmo Riitmuru, J. Sokk","doi":"10.12697/AKUT.2020.26.04","DOIUrl":"https://doi.org/10.12697/AKUT.2020.26.04","url":null,"abstract":"The aim of the study was to find the occurrence of musculoskeletal injuries in Estonia professional ballet dancers in the 2019/2020 season. A total of 62 dancers participated in the study, 25 were male and 37 female dancers. This study was a questionnaire-based, which was compiled on similar studies to collect the data among ballet dancers working in Estonia. The study showed that 58% of dancers were injured in the last 12 months. The most common type of dance injury during this period was muscle or tendon strain (33%), followed chronic inflammation (21%) and ankle sprain (20%). The most common injured body site was foot (20%), ankle (18%) and knee joint (10%). The highest number of injuries occurred during rehearsals (44%), classical class (27%), and during performances (16%). More than half of Estonian ballet dancers sustained at least one injury during the last twelve months. The most common types of injury were muscle or tendon strain, chronic inflammation and ankle sprain. The highest number of injuries occurred in the foot, whereas the highest number of injuries occurred during rehearsals.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"548 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133910611","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 : 2020-12-31DOI: 10.12697/AKUT.2020.26.01
J. Jürimäe
Obesity is the most common chronic disease in childhood, and is a risk factor for cardiovascular diseases (CVD) later in life. Being obese is inversely associated with physical activity and cardiorespiratory fitness (CRF) in children. Increased CRF may negate the detrimental effects of obesity-associated risk factors for CVD, while poor CRF has been associated with increased arterial stiffness and higher levels of blood inflammatory markers. The use of time efficient high-intensity interval training (HIIT) to reduce CVD risk factors and body mass, improve CRF and other health parameters has become popular during the last years in adults with obesity. However, a relatively few studies have investigated the effect of HIIT on body composition, CRF and cardiometabolic biomarkers in children with obesity. It is expected that low-volume HIIT programs are feasable for community-based body mass reduction and health promotion in children with obesity.
{"title":"Low-volume high-intensity interval training for children with obesity: a commentary","authors":"J. Jürimäe","doi":"10.12697/AKUT.2020.26.01","DOIUrl":"https://doi.org/10.12697/AKUT.2020.26.01","url":null,"abstract":"Obesity is the most common chronic disease in childhood, and is a risk factor for cardiovascular diseases (CVD) later in life. Being obese is inversely associated with physical activity and cardiorespiratory fitness (CRF) in children. Increased CRF may negate the detrimental effects of obesity-associated risk factors for CVD, while poor CRF has been associated with increased arterial stiffness and higher levels of blood inflammatory markers. The use of time efficient high-intensity interval training (HIIT) to reduce CVD risk factors and body mass, improve CRF and other health parameters has become popular during the last years in adults with obesity. However, a relatively few studies have investigated the effect of HIIT on body composition, CRF and cardiometabolic biomarkers in children with obesity. It is expected that low-volume HIIT programs are feasable for community-based body mass reduction and health promotion in children with obesity.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129622878","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 : 2020-12-31DOI: 10.12697/AKUT.2020.26.06
Leili Väisa, J. Ereline, Mati Pääsuke, T. Kums
The aim of the present study was to establish the changes that occur in dancers’ static body balance indicators during rest, in case of interfering factors and in stress condition. The sample consisted of 14 advanced female folk dancers at the age of 16–20 years. The participants’ static body balance was measured at the beginning (in the autumn) and at the end (in the spring) of the eight-month dancing period. Static body balance indicators were registered on a dynamographic platform within 30 seconds, standing on bipedal on stable and unstable support surface in eyes-open (EO) and eyes-closed (EC) conditions. The Flamingo test balance control, the balance control after spinning around and jumping tests were conducted only in EO condition. The following parameters were registered: the movements of the centre of pressure (CoP) in the anterior-posterior (AP) and medio-lateral (ML) dimensions; the length, speed and area of the trajectory. According to the study, folk dancers’ CoP movements in the AP and ML dimensions, measured in different conditions (EO, EC), on stable and unstable support surface, did not change significantly after the eight-month dancing practice. The young folk dancers’ static body balance, assessed by CoP movement trajectory, speed and area, improved considerably over the eight-month training period. Flamingo test results indicate that practising folk dance develops the young female folk dancers’ right and left side static stability equally. In the context of Estonian folk dance practice, including preparation for performing at dance festival, the young female folk dancers’ balance performance improved both in vestibular instability (spins, standing on unstable support surface and in EO condition) and fatigue (jumping test) conditions.
{"title":"The effect of Estonian folk dance practice on static balance performance in young females","authors":"Leili Väisa, J. Ereline, Mati Pääsuke, T. Kums","doi":"10.12697/AKUT.2020.26.06","DOIUrl":"https://doi.org/10.12697/AKUT.2020.26.06","url":null,"abstract":"The aim of the present study was to establish the changes that occur in dancers’ static body balance indicators during rest, in case of interfering factors and in stress condition. The sample consisted of 14 advanced female folk dancers at the age of 16–20 years. The participants’ static body balance was measured at the beginning (in the autumn) and at the end (in the spring) of the eight-month dancing period. Static body balance indicators were registered on a dynamographic platform within 30 seconds, standing on bipedal on stable and unstable support surface in eyes-open (EO) and eyes-closed (EC) conditions. The Flamingo test balance control, the balance control after spinning around and jumping tests were conducted only in EO condition. The following parameters were registered: the movements of the centre of pressure (CoP) in the anterior-posterior (AP) and medio-lateral (ML) dimensions; the length, speed and area of the trajectory. According to the study, folk dancers’ CoP movements in the AP and ML dimensions, measured in different conditions (EO, EC), on stable and unstable support surface, did not change significantly after the eight-month dancing practice. The young folk dancers’ static body balance, assessed by CoP movement trajectory, speed and area, improved considerably over the eight-month training period. Flamingo test results indicate that practising folk dance develops the young female folk dancers’ right and left side static stability equally. In the context of Estonian folk dance practice, including preparation for performing at dance festival, the young female folk dancers’ balance performance improved both in vestibular instability (spins, standing on unstable support surface and in EO condition) and fatigue (jumping test) conditions.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114754549","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 : 2020-12-31DOI: 10.12697/AKUT.2020.26.05
K. Reisberg, Cara Kaup
The participant of this study was a 40-year-old female, who mainly complained of middle thoracic stiffness and pain in extension at the mid thoracic level with hyperkyphosis, forward head and mild thoracic dextroscoliosis. The subject participated in multimodal home-based physiotherapy program with the duration of 9 months, consisting of posture exercises, soft tissue massage therapy and thoracic manipulations. Comparison of initial and final evaluation revealed the improvement in all evaluated variables, including the reduction of thoracic hyperkyphosis, forward head posture and thoracic dextroscoliosis, freer and less painful thoracic spine extension mobility, no pain in the sacroiliac joint, and increased satisfaction with the posture. There was also notable improvement in the algometry of the paraspinal muscles, equalization of functional lower-leg length and rib-pelvic distance of both sides of body. In conclusion, the proposed physiotherapy protocol can be beneficial in addressing postural faults such as thoracic hyperkyphosis, forward head and scoliosis. However, further research is needed with a larger sample.
{"title":"Efficacy of a multimodal physiotherapy treatment program for postural disorders and pain: a case report","authors":"K. Reisberg, Cara Kaup","doi":"10.12697/AKUT.2020.26.05","DOIUrl":"https://doi.org/10.12697/AKUT.2020.26.05","url":null,"abstract":"The participant of this study was a 40-year-old female, who mainly complained of middle thoracic stiffness and pain in extension at the mid thoracic level with hyperkyphosis, forward head and mild thoracic dextroscoliosis. The subject participated in multimodal home-based physiotherapy program with the duration of 9 months, consisting of posture exercises, soft tissue massage therapy and thoracic manipulations. Comparison of initial and final evaluation revealed the improvement in all evaluated variables, including the reduction of thoracic hyperkyphosis, forward head posture and thoracic dextroscoliosis, freer and less painful thoracic spine extension mobility, no pain in the sacroiliac joint, and increased satisfaction with the posture. There was also notable improvement in the algometry of the paraspinal muscles, equalization of functional lower-leg length and rib-pelvic distance of both sides of body. In conclusion, the proposed physiotherapy protocol can be beneficial in addressing postural faults such as thoracic hyperkyphosis, forward head and scoliosis. However, further research is needed with a larger sample.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"56 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131471395","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 : 2019-01-02DOI: 10.12697/akut.2018.24.04
E. Riso, Lisette Toplaan, Piret Viira, S. Vaiksaar, J. Jürimäe
The objective of this study was to investigate physical fitness of preschoolaged children just before entering school according to their body mass index, and to examine possible associations of body mass index, fat mass and fat-free mass with physical fitness in preschool-aged children. Two hundred and fifty-six preschoolers aged 6 to 7 years participated in the study. Physical fitness was assessed using PREFIT test battery and body composition was estimated using four skinfold thickness parameters. Overweight children had lower cardiorespiratory fitness and lower results in all weight-bearing fitness tests, and better handgrip strength test result in comparison with normal-weight children. Significant associations were found between body composition indices and the results of physical fitness tests. Higher BMI associated negatively with weight-bearing physical fitness tests. The results of the research indicate that weight-status and body composition have significant effect on physical fitness in 6–7 years old preschoolers.
{"title":"Physical fitness in preschoolers according to body composition","authors":"E. Riso, Lisette Toplaan, Piret Viira, S. Vaiksaar, J. Jürimäe","doi":"10.12697/akut.2018.24.04","DOIUrl":"https://doi.org/10.12697/akut.2018.24.04","url":null,"abstract":"The objective of this study was to investigate physical fitness of preschoolaged children just before entering school according to their body mass index, and to examine possible associations of body mass index, fat mass and fat-free mass with physical fitness in preschool-aged children. Two hundred and fifty-six preschoolers aged 6 to 7 years participated in the study. Physical fitness was assessed using PREFIT test battery and body composition was estimated using four skinfold thickness parameters. Overweight children had lower cardiorespiratory fitness and lower results in all weight-bearing fitness tests, and better handgrip strength test result in comparison with normal-weight children. Significant associations were found between body composition indices and the results of physical fitness tests. Higher BMI associated negatively with weight-bearing physical fitness tests. The results of the research indicate that weight-status and body composition have significant effect on physical fitness in 6–7 years old preschoolers.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129361016","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 : 2019-01-02DOI: 10.12697/AKUT.2018.24.05
S. Lobben, Lena Malnes, S. Berntsen, Leif I Tjelta, E. Bere, M. Kristoffersen, Thomas Mildestvedt
In the present study we aimed primarily to examine cycling time and distance when inactive subjects were provided with electrically assisted bicycles. Secondly to evaluate changes in maximal oxygen uptake. Inactive employees in a selection of public and private corporations in three Norwegian cities were invited to participate. Inclusion criteria were: a desire to cycle to work, residence more than 3 km from the workplace, and not physically active according to guidelines. There were 25 participants in the study and we provided them all with electrically assisted bicycles fitted with GPS bike computers to record usage. The participants were followed for three to eight months, 226 days on average. Measures of maximal oxygen uptake were performed before and after the intervention. Demographic characteristics and prior transportation habits were reported in a questionnaire at baseline. Participants cycled for 107.1± 62 min per week covering 37.6 ± 24 km per week. The distances cycled were significantly greater in the autumn (47.4 km/week, p=0.035) than in the spring (32.1 km/week). Participants cycled more on weekdays (7.1 km/day, p < 0.001) compared to weekends (0.9 km/day, p<0.001). Maximal oxygen uptake improved significantly, 2.4 ml/min/kg (7.7 %), p<0.001 and this was associated with cycling distance (r=0.49, p=0.042) and self-reported commuting distance (r=0.51, p=0.018). Offering electrically assisted bicycles to inactive employees may initiate transport-related physical activity and may give positive health effects.
{"title":"Bicycle usage among inactive adults provided with electrically assisted bicycles","authors":"S. Lobben, Lena Malnes, S. Berntsen, Leif I Tjelta, E. Bere, M. Kristoffersen, Thomas Mildestvedt","doi":"10.12697/AKUT.2018.24.05","DOIUrl":"https://doi.org/10.12697/AKUT.2018.24.05","url":null,"abstract":"In the present study we aimed primarily to examine cycling time and distance when inactive subjects were provided with electrically assisted bicycles. Secondly to evaluate changes in maximal oxygen uptake. Inactive employees in a selection of public and private corporations in three Norwegian cities were invited to participate. Inclusion criteria were: a desire to cycle to work, residence more than 3 km from the workplace, and not physically active according to guidelines. There were 25 participants in the study and we provided them all with electrically assisted bicycles fitted with GPS bike computers to record usage. The participants were followed for three to eight months, 226 days on average. Measures of maximal oxygen uptake were performed before and after the intervention. Demographic characteristics and prior transportation habits were reported in a questionnaire at baseline. Participants cycled for 107.1± 62 min per week covering 37.6 ± 24 km per week. The distances cycled were significantly greater in the autumn (47.4 km/week, p=0.035) than in the spring (32.1 km/week). Participants cycled more on weekdays (7.1 km/day, p < 0.001) compared to weekends (0.9 km/day, p<0.001). Maximal oxygen uptake improved significantly, 2.4 ml/min/kg (7.7 %), p<0.001 and this was associated with cycling distance (r=0.49, p=0.042) and self-reported commuting distance (r=0.51, p=0.018). Offering electrically assisted bicycles to inactive employees may initiate transport-related physical activity and may give positive health effects.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121298377","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 : 2019-01-02DOI: 10.12697/akut.2018.24.07
M. Helland, G. L. Nordbotten, C. N. Hagum, Leif I Tjelta
The aim of this study was to examine the impact of a 33-week program, which included two weekly intensive running sessions, on aerobic capacity, BMI, waist circumference and body composition in overweight and obese, inactive adults. An additional aim was to examine the additional impact of lifestyle modification education. Twenty-four participants in the Training Group (exercise only) and 27 in the Nutritional Guidance and Training Group (exercise + nutritional guidance) completed the study. Anthropometric measurements (BMI, waist circumference, visceral fat, muscle mass and fat percentage) and 3000 m running time were measured at start, after 15 weeks (BMI, waist circumference and 3000 m running time) and after 33 weeks of intervention. Significant reductions in BMI, waist circumference, fat percentage and 3000 m running time were found for both groups. A small, but insignificant, increase was found for muscle mass in both groups and visceral fat in the training group. A significant interaction effect for visceral fat was also found. Both groups improved their running time and anthropometric measurements. No significant differences were found between the groups.
{"title":"Aerobic training combined with nutritional guidance as an effective strategy for improving aerobic fitness and reducing BMI in inactive adults","authors":"M. Helland, G. L. Nordbotten, C. N. Hagum, Leif I Tjelta","doi":"10.12697/akut.2018.24.07","DOIUrl":"https://doi.org/10.12697/akut.2018.24.07","url":null,"abstract":"The aim of this study was to examine the impact of a 33-week program, which included two weekly intensive running sessions, on aerobic capacity, BMI, waist circumference and body composition in overweight and obese, inactive adults. An additional aim was to examine the additional impact of lifestyle modification education. Twenty-four participants in the Training Group (exercise only) and 27 in the Nutritional Guidance and Training Group (exercise + nutritional guidance) completed the study. Anthropometric measurements (BMI, waist circumference, visceral fat, muscle mass and fat percentage) and 3000 m running time were measured at start, after 15 weeks (BMI, waist circumference and 3000 m running time) and after 33 weeks of intervention. Significant reductions in BMI, waist circumference, fat percentage and 3000 m running time were found for both groups. A small, but insignificant, increase was found for muscle mass in both groups and visceral fat in the training group. A significant interaction effect for visceral fat was also found. Both groups improved their running time and anthropometric measurements. No significant differences were found between the groups.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116408872","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 : 2019-01-02DOI: 10.12697/AKUT.2018.24.02
Henri Tilga, Hanna Kalajas-Tilga, V. Hein, L. Raudsepp, A. Koka
Based on self-determination theory, adolescents’ leisure-time (LT) physical activity (PA) behaviour may depend on the extent by which they perceive an environment as autonomy-supportive. The present study aimed to investigate whether adolescents’ perception of autonomy-supportive behaviour from their peers is related to adolescents’ objectively measured LT moderate-to-vigorous physical activity (MVPA) through perceived psychological needs satisfaction and intrinsic motivation towards PA. School students (n=215) aged between 12 to 15 years old (age: 13.20±0.96 yrs) completed self-reported measures of perceived peers’ autonomy support, psychological needs satisfaction, and intrinsic motivation in the context of LT PA. In addition, study participants wore an accelerometer (Acti-Graph GT3X) to monitor their MVPA. Results of the structural equation modelling revealed that perceived autonomy support from peers had a significant and positive effect on perceptions of all three psychological need satisfaction in LT, which, in turn, had a significant and positive effect on adolescents’ intrinsic motivation. Adolescents’ LT PA was significantly predicted by their intrinsic motivation towards PA. Only one pathway through autonomy need satisfaction was revealed by which adolescents’ perception of their peers’ autonomy-supportive behaviour is related to intrinsic motivation and MVPA. The findings of the current study highlight the role of peers’ autonomy-supportive behaviour on adolescents objectively measured PA through motivational processes in the context of LT.
{"title":"The effect of peers’ autonomy-supportive behaviour on adolescents’ psychological need satisfaction, intrinsic motivation and objectively measured physical activity","authors":"Henri Tilga, Hanna Kalajas-Tilga, V. Hein, L. Raudsepp, A. Koka","doi":"10.12697/AKUT.2018.24.02","DOIUrl":"https://doi.org/10.12697/AKUT.2018.24.02","url":null,"abstract":"Based on self-determination theory, adolescents’ leisure-time (LT) physical activity (PA) behaviour may depend on the extent by which they perceive an environment as autonomy-supportive. The present study aimed to investigate whether adolescents’ perception of autonomy-supportive behaviour from their peers is related to adolescents’ objectively measured LT moderate-to-vigorous physical activity (MVPA) through perceived psychological needs satisfaction and intrinsic motivation towards PA. School students (n=215) aged between 12 to 15 years old (age: 13.20±0.96 yrs) completed self-reported measures of perceived peers’ autonomy support, psychological needs satisfaction, and intrinsic motivation in the context of LT PA. In addition, study participants wore an accelerometer (Acti-Graph GT3X) to monitor their MVPA. Results of the structural equation modelling revealed that perceived autonomy support from peers had a significant and positive effect on perceptions of all three psychological need satisfaction in LT, which, in turn, had a significant and positive effect on adolescents’ intrinsic motivation. Adolescents’ LT PA was significantly predicted by their intrinsic motivation towards PA. Only one pathway through autonomy need satisfaction was revealed by which adolescents’ perception of their peers’ autonomy-supportive behaviour is related to intrinsic motivation and MVPA. The findings of the current study highlight the role of peers’ autonomy-supportive behaviour on adolescents objectively measured PA through motivational processes in the context of LT.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132873276","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 : 2019-01-02DOI: 10.12697/AKUT.2018.24.06
Hågen Fjørkenstad Dybdal, R. Tillaar
The purpose of this study was to examine the acute effects of using the SpeedMaker™ on step-by-step kinematics and muscle activity in 30-m sprints and if it is possible to elicit a post-activation potentiation stimulus with the SpeedMaker™ upon subsequent 30-m sprint performance. Thirteen male soccer players (age: 22.8±1.8 yr, body mass: 75.1±11.9 kg, height: 1.80±0.08 m) participated in a repeated measure and cross-over design consisting of two conditions: three normal 30-m sprints (control) and two normal 30-m sprints divided by one 30-m sprint with the SpeedMaker™ (intervention). Kinematics were measured for each step together with the peak muscle activity of the hamstrings, quadriceps and gluteus during each stride of each 30-m sprint. The main findings were that sprinting with the SpeedMaker™ increased sprint times by 1.7% compared to normal 30-m sprints. However, no occurrence of a postactivation potentiation (PAP) response was found when performing a 30-m sprint with the SpeedMaker™ prior to a normal 30-m sprint in male soccer players. Furthermore, no detectable differences in step-by-step analysis on kinematics and muscle activity were found between the sprints with and without the SpeedMaker™. Only hamstrings and gluteus activity increased per stride over 30-m. It was concluded that the SpeedMaker™ did influence sprint times, but only in a small way that kinematics and muscle activity did not change detectable. Furthermore, that the SpeedMaker™ did not elicit a PAP effect. In addition, increased hamstring and gluteus maximus activation during the 30-m sprints suggests that these muscles are very important for acceleration, and that it is likely that acute hamstring strains occur when a soccer player is close to maximal velocity, as hamstring activation is maximal at that point.
{"title":"The acute and post-activation potentiation effects of the SPEEDMAKER™ on step-by step kinematics, muscle activation and performance in 30-m sprints","authors":"Hågen Fjørkenstad Dybdal, R. Tillaar","doi":"10.12697/AKUT.2018.24.06","DOIUrl":"https://doi.org/10.12697/AKUT.2018.24.06","url":null,"abstract":"The purpose of this study was to examine the acute effects of using the SpeedMaker™ on step-by-step kinematics and muscle activity in 30-m sprints and if it is possible to elicit a post-activation potentiation stimulus with the SpeedMaker™ upon subsequent 30-m sprint performance. Thirteen male soccer players (age: 22.8±1.8 yr, body mass: 75.1±11.9 kg, height: 1.80±0.08 m) participated in a repeated measure and cross-over design consisting of two conditions: three normal 30-m sprints (control) and two normal 30-m sprints divided by one 30-m sprint with the SpeedMaker™ (intervention). Kinematics were measured for each step together with the peak muscle activity of the hamstrings, quadriceps and gluteus during each stride of each 30-m sprint. The main findings were that sprinting with the SpeedMaker™ increased sprint times by 1.7% compared to normal 30-m sprints. However, no occurrence of a postactivation potentiation (PAP) response was found when performing a 30-m sprint with the SpeedMaker™ prior to a normal 30-m sprint in male soccer players. Furthermore, no detectable differences in step-by-step analysis on kinematics and muscle activity were found between the sprints with and without the SpeedMaker™. Only hamstrings and gluteus activity increased per stride over 30-m. It was concluded that the SpeedMaker™ did influence sprint times, but only in a small way that kinematics and muscle activity did not change detectable. Furthermore, that the SpeedMaker™ did not elicit a PAP effect. In addition, increased hamstring and gluteus maximus activation during the 30-m sprints suggests that these muscles are very important for acceleration, and that it is likely that acute hamstring strains occur when a soccer player is close to maximal velocity, as hamstring activation is maximal at that point.","PeriodicalId":287636,"journal":{"name":"Acta Kinesiologiae Universitatis Tartuensis","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122752725","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 : 2019-01-02DOI: 10.12697/AKUT.2018.24.09
S. Ben-Zaken, Y. Meckel, D. Nemet, A. Eliakim
The ACSL A/G polymorphism is associated with endurance trainability. Previous studies have demonstrated that homozygotes of the minor AA allele had a reduced maximal oxygen consumption response to training compared to the common GG allele homozygotes, and that the ACSL A/G single nucleotide polymorphism explained 6.1% of the variance in the VO2max response to endurance training. The contribution of ACSL single nucleotide polymorphism to endurance trainability was shown in nonathletes, however, its potential role in professional athletes is not clear. Moreover, the genetic basis to anaerobic trainability is even less studied. Therefore, the aim of the present study was to examine the prevalence of ACSL single nucleotide polymorphism among professional Israeli long distance runners (n=59), middle distance runners (n=31), sprinters and jumpers (n=48) and non-athletic controls (n=60). The main finding of the present study was that the ACSL1 AA genotype, previously shown to be associated with reduced endurance trainability, was not higher among sprinters and jumpers (15%) compared to middle- (16%) and long-distance runners (15%). This suggests that in contrast to previous studies indicating that the ACSL1 single nucleotide polymorphism may influence endurance trainability among non-athletic individuals, the role of this polymorphism among professional athletes is still not clear.
ACSL A/G多态性与耐力可训练性有关。先前的研究表明，与常见的GG等位基因纯合子相比，次要AA等位基因的纯合子对训练的最大耗氧量反应降低，并且ACSL a /G单核苷酸多态性解释了耐力训练VO2max反应变异的6.1%。ACSL单核苷酸多态性对耐力训练能力的贡献在非运动员中得到证实，但其在职业运动员中的潜在作用尚不清楚。此外，对厌氧可训练性的遗传基础研究更少。因此，本研究的目的是研究ACSL单核苷酸多态性在以色列专业长跑运动员(n=59)、中长跑运动员(n=31)、短跑运动员和跳远运动员(n=48)和非运动对照组(n=60)中的流行程度。本研究的主要发现是，ACSL1 AA基因型在短跑运动员和跳远运动员中(15%)并不比中长跑运动员(16%)和长跑运动员(15%)高，而ACSL1 AA基因型先前被证明与耐力训练能力降低有关。这表明，与以往研究表明ACSL1单核苷酸多态性可能影响非运动个体的耐力可训练性相反，这种多态性在职业运动员中的作用仍不清楚。
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