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Thoracolumbar Fascia and Lumbar Muscle Stiffness in Athletes with A History of Hamstring Injury 有腘绳肌损伤史的运动员的胸腰部筋膜和腰部肌肉僵硬度
Pub Date : 2024-06-01 DOI: 10.52082/jssm.2024.436
E. Kellis, Afxentios Kekelekis, Eleni E. Drakonaki
The purpose of this study was to examine the differences in thoracolumbar fascia (TLF) and lumbar muscle modulus in individuals with and without hamstring injury using shear wave elastography (SWE). Thirteen male soccer players without a previous hamstring injury and eleven players with a history of hamstring injury performed passive and active (submaximal) knee flexion efforts from 0°, 45° and 90° angle of knee flexion as well as an active prone trunk extension test. The elastic modulus of the TLF, the erector spinae (ES) and the multifidus (MF) was measured using ultrasound SWE simultaneously with the surface electromyography (EMG) signal of the ES and MF. The TLF SWE modulus was significantly (p < 0.05) higher in the injured group (range: 29.86 ± 8.58 to 66.57 ± 11.71 kPa) than in the uninjured group (range: 17.47 ± 9.37 to 47.03 ± 16.04 kPa). The ES and MF modulus ranged from 14.97 ± 4.10 to 66.57 ± 11.71 kPa in the injured group and it was significantly (p < .05) greater compared to the uninjured group (range: 11.65 ± 5.99 to 40.49 ± 12.35 kPa). TLF modulus was greater than ES and MF modulus (p < 0.05). Active modulus was greater during the prone trunk extension test compared to the knee flexion tests and it was greater in the knee flexion test at 0° than at 90° (p < 0.05). The muscle EMG was greater in the injured compared to the uninjured group in the passive tests only (p < 0.05). SWE modulus of the TLF and ES and MF was greater in soccer players with previous hamstring injury than uninjured players. Further research could establish whether exercises that target the paraspinal muscles and the lumbar fascia can assist in preventing individuals with a history of hamstring injury from sustaining a new injury.
本研究的目的是利用剪切波弹性成像(SWE)检查腿筋受伤者和未受伤者胸腰筋膜(TLF)和腰肌模量的差异。13 名没有腿筋损伤的男性足球运动员和 11 名有腿筋损伤史的球员分别进行了从 0°、45° 和 90°屈膝角度的被动和主动(亚极限)屈膝运动以及主动俯卧躯干伸展测试。在测量 TLF、竖脊肌(ES)和多股肌(MF)的弹性模量时,使用了超声波 SWE,并同时测量了 ES 和 MF 的表面肌电图(EMG)信号。受伤组的 TLF SWE 模量(范围:29.86 ± 8.58 至 66.57 ± 11.71 kPa)明显高于未受伤组(范围:17.47 ± 9.37 至 47.03 ± 16.04 kPa)(p < 0.05)。受伤组的 ES 和 MF 模量范围为 14.97 ± 4.10 至 66.57 ± 11.71 kPa,与未受伤组(范围:11.65 ± 5.99 至 40.49 ± 12.35 kPa)相比显著增大(p < .05)。TLF 模量大于 ES 和 MF 模量(p < 0.05)。与膝关节屈曲测试相比,俯卧躯干伸展测试中的主动模量更大,膝关节屈曲测试中0°时的主动模量大于90°时的主动模量(P < 0.05)。仅在被动测试中,受伤组的肌肉肌电图大于未受伤组(P < 0.05)。曾受过腿筋损伤的足球运动员的 TLF、ES 和 MF 的 SWE 模量大于未受过损伤的运动员。进一步的研究可以确定,针对脊柱旁肌肉和腰部筋膜的锻炼是否有助于防止曾受过腿筋损伤的人再次受伤。
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引用次数: 0
Jumping Interval Training: An Effective Training Method for Enhancing Anaerobic, Aerobic, and Jumping Performances in Aerobic Gymnastics 跳跃间歇训练:增强有氧体操中无氧、有氧和跳跃性能的有效训练方法
Pub Date : 2024-06-01 DOI: 10.52082/jssm.2024.410
Dong Ma, R. Silva, Qi Xu, Ke Wang, Zijian Zhao
The aim of this study was to compare the effects of jumping interval training (JIT) and running high-intensity interval training (HIIT) on the aerobic, anaerobic and jumping performances of youth female aerobic gymnasts. A randomized controlled study was conducted over an 8-week period, involving 73 youth female athletes (16.2 ± 1.3 years old) of aerobic gymnastics. The study comprised two experimental groups (JIT and HIIT) and a control group. Participants in the experimental groups engaged in two additional training sessions per week alongside their regular training regimen, while the control group followed their usual training routine. Before and after the intervention period, gymnasts were assessed for their performance in the countermovement jump test (CMJ), the specific aerobic gymnastics anaerobic test (SAGAT) and the 20-m multistage fitness test. Significant interactions time × group were found in SAGAT (p < 0.001; = 0.495), CMJ (p < 0.001; = 0.338) and 20-m multistage fitness test (p < 0.001; = 0.500). The time × group analysis post-intervention revealed significantly lower scores in SAGAT for the control group compared to the JIT (p = 0.003) and HIIT (p = 0.034). Additionally, significantly higher scores were observed for the JIT group in the CMJ test compared to the HIIT (p = 0.020) and control (p = 0.028) groups following the intervention. Finally, the 20 m multistage fitness test post-intervention revealed significantly lower scores for the control group compared to JIT (p < 0.001) and HIIT (p < 0.001). Both JIT and HIIT are recommended training strategies to adopt in aerobic gymnastics for significantly improving the aerobic and anaerobic performances of athletes. However, JIT may be particularly relevant to use as it offers additional benefits in improving vertical jumping performances.
本研究旨在比较跳跃间歇训练(JIT)和跑步高强度间歇训练(HIIT)对青少年女子有氧体操运动员的有氧、无氧和跳跃表现的影响。这项随机对照研究为期 8 周,涉及 73 名青少年女子有氧体操运动员(16.2 ± 1.3 岁)。研究包括两个实验组(JIT 和 HIIT)和一个对照组。实验组的参与者在进行常规训练的同时,每周额外进行两次训练,而对照组则按照常规训练进行。在干预期前后,对体操运动员进行了反向移动跳跃测试(CMJ)、特定有氧体操无氧测试(SAGAT)和 20 米多阶段体能测试的成绩评估。在 SAGAT(p < 0.001; = 0.495)、CMJ(p < 0.001; = 0.338)和 20 米多段体能测试(p < 0.001; = 0.500)中发现了时间×组别的显著交互作用。干预后的时间×组别分析显示,对照组的 SAGAT 分数明显低于 JIT 组(p = 0.003)和 HIIT 组(p = 0.034)。此外,与 HIIT 组(p = 0.020)和对照组(p = 0.028)相比,JIT 组在干预后的 CMJ 测试中得分明显更高。最后,干预后的 20 米多级体能测试显示,对照组的得分明显低于 JIT 组(p < 0.001)和 HIIT 组(p < 0.001)。JIT和HIIT都是建议在有氧体操中采用的训练策略,可显著提高运动员的有氧和无氧表现。然而,JIT 在提高垂直跳跃成绩方面具有额外的优势,因此尤其值得使用。
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引用次数: 0
Small-Sided Soccer Games Promote Greater Adaptations on Vertical Jump and Change-of-Direction Deficit and Similar Adaptations in Aerobic Capacity than High-Intensity Interval Training in Females 与高强度间歇训练相比,小范围足球比赛对女性垂直跳跃和变向缺陷的适应性更强,对有氧能力的适应性也相似
Pub Date : 2024-06-01 DOI: 10.52082/jssm.2024.445
XiaoYuan Wen, FaMing Song, LiuXi Yang, Qi Xu
The objective of this study was to compare the effectiveness of both small-sided games (SSG) and short interval running-based high-intensity interval training (HIIT) programs over an 8-week period in fostering adaptations in aerobic capacity, change-of-direction abilities, and jumping performances of youth female soccer players. The study involved 48 female youth participants under the age of 19, competing at the regional level, who took part in a randomized controlled trial. Participants were assigned to either the SSG group, the HIIT group, or a control group, which involved regular in-field sessions. Assessments were conducted at baseline and after the 8-week training intervention, measuring aerobic capacity using the 30-15 intermittent fitness test (VIFT), change of direction (COD) using the 5-0-5 test, and jumping performance using the countermovement jump test (CMJ). Time 5 group analysis revealed significant interactions in CMJ (p = 0.005; ηp2= 0.213) and VIFT (p < 0.001; ηp2 = 0.433), although no significant interaction were found in COD deficit (p = 0.246; ηp2 = 0.060). Within-group analysis revealed that SSG significantly improved CMJ (p < 0.001), COD deficit (p < 0.001), and VIFT (p < 0.001). HIIT group also significantly improved CMJ (p = 0.029), COD deficit (p = 0.001), and VIFT (p < 0.001). As conclusion, the study revealed that SSG promoted significantly improvements in VIFT, CMJ and COD deficit, being significantly better than control group, while HIIT was only significantly better than control in VIFT. SSG revealed to be effective approach for favoring key physical attributes of female soccer players, being an interesting and recommended training approach to increase the ecology of the training practice, while favoring physical positive adaptations.
本研究的目的是比较为期 8 周的小型足球比赛(SSG)和基于短距离间歇跑的高强度间歇训练(HIIT)项目在促进青少年女足运动员的有氧能力、变向能力和跳跃表现的适应性方面的效果。这项研究涉及 48 名年龄在 19 岁以下、参加地区级比赛的青少年女运动员,她们参加了随机对照试验。参与者被分配到 SSG 组、HIIT 组或对照组(包括常规的场内训练)。在基线和为期8周的训练干预结束后进行了评估,使用30-15间歇体能测试(VIFT)测量有氧能力,使用5-0-5测试测量变向能力(COD),使用反向移动跳跃测试(CMJ)测量跳跃表现。时间 5 组分析显示,CMJ(p = 0.005;ηp2 = 0.213)和 VIFT(p < 0.001;ηp2 = 0.433)存在显著的交互作用,但 COD 缺陷(p = 0.246;ηp2 = 0.060)没有发现显著的交互作用。组内分析显示,SSG 显著改善了 CMJ(p < 0.001)、COD 缺陷(p < 0.001)和 VIFT(p < 0.001)。HIIT 组也明显改善了 CMJ(p = 0.029)、COD 亏损(p = 0.001)和 VIFT(p < 0.001)。总之,研究表明,SSG 对 VIFT、CMJ 和 COD 赤字有明显改善,明显优于对照组,而 HIIT 仅在 VIFT 方面明显优于对照组。研究表明,SSG 是提高女足运动员关键身体素质的有效方法,是一种有趣且值得推荐的训练方法,可提高训练实践的生态性,同时有利于身体的积极适应。
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引用次数: 0
Race Dynamics in Triathlon Mixed-Team-Relay Meaningfully Changes with The New Regulation Towards Paris 2024 铁人三项混合团队接力赛的比赛动态随着面向 2024 年巴黎奥运会的新规定而发生重大变化
Pub Date : 2024-06-01 DOI: 10.52082/jssm.2024.358
J. Martínez-Sobrino, J. S. Del Cerro, J. M. González-Ravé, Santiago Veiga
Mixed-Team-Relay (MTR) triathlon is a novel Olympic discipline whose performance determinants and tactical behaviors have barely been studied. Additionally, a regulatory change has been made to the male and female relay order for the Paris 2024 Olympics. Therefore, this study aimed to determine the performance determinants and race dynamics as a function of competitive level on the new regulated MTR triathlon. Results from 129 national teams, (516 elite triathletes) across five MTR World Triathlon Series and two MTR European Championships in 2022 and 2023, were analyzed. Split times, average speeds, time behind the race leader (gap), partial and finishing positions, pack position as well as the rank positions of every segment, relay leg, and overall race were computed. Decision tree analyses were conducted as a predictive method for the overall results, and correspondence analyses were conducted to examine the relationship between the different relay legs and segments and the finishing positions. The performance of the fourth leg was the most relevant for overall result (30%), as well as the fourth running leg (16%) and the female legs performance (7%). Medallist relay teams were characterized by displaying a differential speed lower than 0.5 and 0.83 km/h, respectively, from the best-ranking athletes in the Legs 1 and 4. Furthermore, staying in the front pack after the second swimming leg showed a great relationship with achieving a medal position. New MTR triathlon rules shift race dynamics, emphasizing individual efforts in cycling and swimming, while maintaining the crucial importance of running.
混合团队接力(MTR)铁人三项是一项新颖的奥运项目,其成绩决定因素和战术行为几乎没有被研究过。此外,2024 年巴黎奥运会对男女接力顺序进行了调整。因此,本研究旨在确定新规定的 MTR 铁人三项比赛的成绩决定因素和比赛动态与竞技水平的关系。研究分析了 129 个国家队(516 名精英铁人三项运动员)在五次 MTR 世界铁人三项系列赛和 2022 年和 2023 年两次 MTR 欧洲锦标赛中的成绩。计算了分段时间、平均速度、落后领跑者的时间(差距)、部分位置和终点位置、分组位置以及每个赛段、接力段和整个比赛的排名位置。采用决策树分析法对总成绩进行预测,并采用对应分析法研究不同接力段和赛段与终点位置之间的关系。第四接力段的成绩与总成绩的相关性最大(30%),与第四跑段(16%)和女子接力段成绩的相关性也最大(7%)。获得奖牌的接力队的特点是,在第一和第四赛段与排名最好的运动员的速度差分别低于每小时 0.5 公里和 0.83 公里。此外,在第二泳段后保持在前列与获得奖牌名次有很大关系。新的港鐵三項鐵人賽規則改變了比賽動力,強調個人在自行車和游泳方面的努力,同時維持跑步的重要性。
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引用次数: 0
Low-load Resistance Exercise with Perceptually Primed Practical Blood Flow Restriction Induces Similar Motor Performance Fatigue, Physiological Changes, and Perceptual Responses Compared to Traditional Blood Flow Restriction in Males and Females 与传统的血流限制相比,在男性和女性中进行低负荷阻力运动并进行感知诱导的实用血流限制会诱发相似的运动表现疲劳、生理变化和感知反应
Pub Date : 2024-06-01 DOI: 10.52082/jssm.2024.326
Robert Bielitzki, Tom Behrendt, Martin Behrens, Victoria Malczewski, Thomas Mittlmeier, L. Schega
In the recent past, practical blood flow restriction (pBFR) using non-pneumatic, usually elastic cuffs has been established as a cost-effective alternative to traditional blood flow restriction (BFR) using pneumatic cuffs, especially for training in large groups. This study investigated whether low-load resistance exercise with perceptually primed pBFR using an elastic knee wrap is suitable to induce similar motor performance fatigue as well as physiological and perceptual responses compared to traditional BFR using a pneumatic nylon cuff in males and females. In a randomized, counterbalanced cross-over study, 30 healthy subjects performed 4 sets (30-15-15-15 repetitions) of unilateral knee extensions at 20% of their one-repetition-maximum. In the pBFR condition, each individual was perceptually primed to a BFR pressure corresponding to 60% of their arterial occlusion pressure. Before and after exercise, maximal voluntary torque, maximal muscle activity, and cuff pressure-induced discomfort were assessed. Moreover, physiological (i.e., muscle activity, muscle oxygenation) and perceptual responses (i.e., effort and exercise-induced leg muscle pain) were recorded during exercise. Moderate correlations with no differences between pBFR and BFR were found regarding the decline in maximal voluntary torque and maximal muscle activity. Furthermore, no to very strong correlations between conditions, with no differences, were observed for muscle activity, muscle oxygenation, and perceptual responses during exercise sets. However, cuff pressure-induced discomfort was lower in the pBFR compared to the BFR condition. These results indicate that low-load resistance exercise combined with perceptually primed pBFR is a convenient and less discomfort inducing alternative to traditional BFR. This is especially relevant for BFR training with people who have a low cuff-induced discomfort tolerance.
近年来,使用非气动(通常为弹性袖带)的实用血流限制(pBFR)已被认为是一种经济有效的方法,可替代使用气动袖带的传统血流限制(BFR),尤其适用于大型团体训练。本研究调查了与使用尼龙气动袖带的传统血流限制相比,在低负荷阻力运动中使用弹性膝关节包裹进行感知启动的血流限制是否适合在男性和女性中引起相似的运动表现疲劳以及生理和感知反应。在一项随机、平衡交叉研究中,30 名健康受试者进行了 4 组(30-15-15-15-15 次)单侧膝关节伸展训练,训练量为单次最大训练量的 20%。在 pBFR 条件下,每个受试者的知觉初始化为与其动脉闭塞压力的 60% 相对应的 BFR 压力。在运动前后,对最大自主扭矩、最大肌肉活动和袖带压力引起的不适感进行了评估。此外,还记录了运动过程中的生理反应(即肌肉活动、肌肉氧合)和知觉反应(即努力程度和运动引起的腿部肌肉疼痛)。研究发现,pBFR 和 BFR 之间在最大自主扭矩和最大肌肉活动的下降方面存在中度相关性,且无差异。此外,在成套运动中,肌肉活动、肌肉含氧量和知觉反应在不同条件下没有相关性,也没有差异。然而,袖带压力引起的不适感在 pBFR 条件下低于 BFR 条件。这些结果表明,低负荷阻力运动与感知启动的 pBFR 相结合,是替代传统 BFR 的一种方便且较少引起不适的方法。这对于那些对袖带引起的不适耐受性较低的人进行阻力训练尤为重要。
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引用次数: 0
Comparative Analysis of Adaptive Changes in Immunoendocrine and Physiological Responses to High-Intensity Sprint Interval Training with Progressive and Nonprogressive Loads in Young Wrestlers 年轻摔跤运动员对渐进和非渐进负荷高强度短跑间歇训练的免疫内分泌和生理反应的适应性变化对比分析
Pub Date : 2024-06-01 DOI: 10.52082/jssm.2024.455
Kuo Guo, Tianqi Mu
The objective of this study was to explore the effects of a 7-week short sprint interval training (SSIT) with differing in programming volume-loads including progressive (P-SSIT) and nonprogressive (NP-SSIT) approaches on the immunoendocrine, physical fitness attributes and physiological parameters in male wrestlers during the pre-season. Thirty young freestyle wrestlers at the collegiate national-level were included in the study and were divided into three groups: P-SSIT (n = 10), NP-SSIT (n = 10), and an active control group (n = 10). The wrestlers engaged in their specific wrestling training three days weekly, while the P-SSIT and NP-SSIT groups underwent a 7-week SSIT, with scheduling in either progressed or nonprogressed volume-based overloads, three times per week. Before and after the intervention, various aspects of physical fitness (such as 20-m sprint, 4×9-m shuttle run, and maximal strength) and physiological parameters (including cardiorespiratory fitness and anaerobic power output), as well as immunoendocrine responses (such as immunoglobulin-A, testosterone, and cortisol) were measured. Following the training intervention, the control group did not show any significant changes in the variable measured; however, both the P-SSIT and NP-SSIT groups experienced significant improvements (p = 0.001) in physical fitness attributes and physiological parameters with effect sizes ranging from small to very large, and also more adaptive responses compared with control group (p < 0.05). In addition, there were no statistically significant changes observed among the P-SSIT and NP-SSIT groups in terms of immunoendocrine response to training, and physical fitness, as well as physiological parameters (p > 0.05). In conclusion, neither the progressed nor nonprogressed approaches of SSIT demonstrated superior effects on adaptations compared to one another. Therefore, it is recommended for strength and conditioning coaches in wrestling to incorporate both P-SSIT and NP-SSIT into their annual training plan, especially during the pre-season phase, to maximize the physical fitness and physiological parameters of their wrestlers while minimizing changes in immunoendocrine responses.
本研究旨在探讨为期 7 周的短程冲刺间歇训练(SSIT)对男子摔跤运动员在季前赛期间的免疫内分泌、体能属性和生理参数的影响,包括渐进式(P-SSIT)和非渐进式(NP-SSIT)两种不同的程序量负荷方法。研究对象包括 30 名国家级大学自由式摔跤运动员,他们被分为三组:P-SSIT(10 人)、NP-SSIT(10 人)和积极对照组(10 人)。摔跤运动员每周有三天进行特定的摔跤训练,而 P-SSIT 组和 NP-SSIT 组则进行为期 7 周的 SSIT 训练,每周安排三次循序渐进或非循序渐进的体积超负荷训练。干预前后,测量了各方面的体能(如 20 米短跑、4×9 米往返跑和最大力量)和生理参数(包括心肺功能和无氧动力输出),以及免疫内分泌反应(如免疫球蛋白-A、睾酮和皮质醇)。训练干预后,对照组在测量的变量中未显示任何显著变化;然而,P-SSIT 组和 NP-SSIT 组在体能属性和生理参数方面都有显著改善(p = 0.001),效应大小从很小到很大不等,与对照组相比,适应性反应也更强(p < 0.05)。此外,P-SSIT 组和 NP-SSIT 组在免疫内分泌对训练的反应、体能以及生理参数方面均未观察到有统计学意义的变化(P > 0.05)。总之,与其他方法相比,SSIT 的渐进和非渐进方法对适应性的影响都不明显。因此,建议摔跤运动的力量与体能训练教练在其年度训练计划中,特别是在赛季前阶段,同时采用渐进式和非渐进式 SSIT,以最大限度地提高摔跤运动员的体能和生理指标,同时尽量减少免疫内分泌反应的变化。
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引用次数: 0
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Journal of Sports Science and Medicine
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