Local passive heating administered during recovery impairs subsequent isokinetic knee extension exercise performance

IF 0.6 4区医学 Q4 ENGINEERING, BIOMEDICAL

Isokinetics and Exercise Science Pub Date : 2022-10-22 DOI:10.3233/ies-220030

Y. Chang, Xin Liu, C. Hurr

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引用次数: 0

Abstract

BACKGROUND: Passive heating has attracted attention as a potentially promising recovery modality in sports. However, investigations of passive heating have yielded only inconsistent results for exercise performance. OBJECTIVE: To investigate the acute effects of local passive heating administered between repeated bouts of isokinetic exercise. METHODS: The experiment was a randomized crossover study. There was a total of three visits including a familiarization visit. During the remaining two visits, eleven healthy men performed three bouts of nine sets of isokinetic knee extensions using their dominant single-leg (30 repetitions/set, 180∘/sec). A 15 min recovery, during which a local passive heating pad at control (CON) or heating (HT) was applied to the rectus femoris, was afforded after the 3rd and 6th sets (Recovery 1 and 2). Isokinetic exercise performance, as assessed by peak torque, total work, and average power was analyzed using two-way repeated-measures ANOVA. RESULTS: Following Recovery 1 and 2, isokinetic exercise performance, as assessed by peak torque, total work, and average power was reduced in Set 4 (p< 0.001, p< 0.001, p= 0.080) and Set 7 (p< 0.001, p< 0.001, p= 0.009) in the HT group relative to the CON group. Electromyography analysis revealed that signal amplitude was lower in the HT group in Set 4 (p< 0.001) subsequent to Recovery 1, and that firing frequency was higher in Set 7 (p= 0.002) in the HT group after Recovery 2. Furthermore, EMG time-frequency maps from one representative participant showed that following Recovery 1 and 2 peak energy decreased during the first five repetitions in Set 4 and 7. CONCLUSIONS: Local passive heating administered during recovery decreased subsequent performance of isokinetic knee extensors, muscle activation ability and increased firing frequency maintaining force output. Therefore, local passive heating is not an appropriate acute recovery strategy for isokinetic exercises.

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在恢复过程中进行局部被动加热会损害随后的等速膝关节伸展运动表现

背景：被动加热作为一种在体育运动中具有潜在前景的恢复方式引起了人们的关注。然而，对被动加热的研究只对运动表现产生了不一致的结果。目的：研究在等速运动重复发作之间局部被动加热的急性影响。方法：实验采用随机交叉研究。共进行了三次访问，其中包括一次熟悉情况的访问。在剩下的两次访问中，11名健康男性使用他们的优势单腿进行了三次九组等速膝关节伸展（30次/组，180∘/秒）。在第3组和第6组（恢复1和2）后，进行了15分钟的恢复，在此期间，在控制（CON）或加热（HT）下对股直肌施加局部被动加热垫。使用双向重复测量ANOVA分析通过峰值扭矩、总功和平均功率评估的等速运动表现。结果：恢复1和2后，与CON组相比，HT组的第4组（p<0.001，p<0.001，p=0.080）和第7组（p<0.01，p<0.001，p=0.009）的等速运动表现（通过峰值扭矩、总功和平均功率评估）有所下降。肌电图分析显示，在恢复1后的第4组中，HT组的信号幅度较低（p＜0.001），在恢复2后的第7组中，发射频率较高（p＝0.002）。此外，一位代表性参与者的EMG时频图显示，在第4组和第7组的前五次重复中，恢复1和2后的峰值能量下降。结论：在恢复期间给予局部被动加热会降低等速膝伸肌的后续性能、肌肉激活能力，并增加维持力量输出的发射频率。因此，局部被动加热不是等速运动的合适急性恢复策略。

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来源期刊

Isokinetics and Exercise Science 医学-工程：生物医学

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： Isokinetics and Exercise Science (IES) is an international journal devoted to the study of theoretical and applied aspects of human muscle performance. Since isokinetic dynamometry constitutes the major tool in this area, the journal takes a particular interest in exploring the considerable potential of this technology. IES publishes studies associated with the methodology of muscle performance especially with respect to the issues of reproducibility and validity of testing, description of normal and pathological mechanical parameters which are derivable from muscle testing, applications in basic research topics such as motor learning paradigms and electromyography. The journal also publishes studies on applications in clinical settings and technical aspects of the various measurement systems employed in human muscle performance research. The journal welcomes submissions in the form of research papers, reviews, case studies and technical reports from professionals in the fields of sports medicine, orthopaedic and neurological rehabilitation and exercise physiology.