排球运动员重复发球后冈下肌和下斜方肌激活情况的变化
CHANGES IN INFRASPINATUS AND LOWER TRAPEZIUS ACTIVATION IN VOLLEYBALL PLAYERS FOLLOWING REPETITIVE SERVES.
作者信息
Khal Katelyn M, Moore Stephanie D, Pryor J Luke, Singh Bhupinder
机构信息
Clovis North Educational Center, Clovis, CA, USA.
Department of Kinesiology, California State University, Fresno, CA, USA.
出版信息
Int J Sports Phys Ther. 2020 Apr;15(2):196-202.
BACKGROUND
Prolonged and repetitive overhead use of the arm, such as during the volleyball serve, has been linked to overuse injuries.
PURPOSE
To examine changes in activation of the infraspinatus and lower trapezius following performance of repetitive jump-float serves.
STUDY DESIGN
Descriptive Cohort study.
METHODS
Six asymptomatic female Division I college volleyball players (age = 19.2 ± 1.1 years, height = 182.9 ± 2.5 cm, weight = 82.1 ± 12.2 kg) performed 87 jump-float serves in 13 intervals of seven serves each on an NCAA regulated indoor volleyball court. Electromyography (EMG) electrodes were connected to TeleMyo DTS wireless sensor with the DTS EMG lead sampling at 1000 Hz. Dependent variables included Median Power Frequency (MPF) of the infraspinatus (IF) and lower trapezius (LT), as well as rating of perceived exertion (RPE), perceptual fatigue measured using the Borg scale, and heart rate (HR). Paired t-tests were performed to examine differences in variables between interval 1 (serves 1-3) and interval 13 (serves 85-87). Pearson's r Correlation Coefficients were calculated to examine relationships between the dependent variables across all 13 intervals.
RESULTS
IF MPF demonstrated a significant and clinically meaningful decrease from interval 1 to interval 13, indicating muscular fatigue. The decrease in LT MPF from interval 1 to interval 13 was not statistically significant, though it met criteria for clinical meaningfulness and was underpowered. RPE and perceptual fatigue were strongly correlated (r = 0.889. < 0.01) as were RPE and HR (r = 0.679, < 0.01) and HR and fatigue (r = 0.631, < 0.01). IF MPF was weakly related to LT MPF (r = 0.227, < 0.05). LT MPF was weakly related to RPE (r = 0.352, < 0.01), perceptual fatigue (r = 0.313, < 0.01), and HR (r = 0.322, < 0.01).
CONCLUSIONS
Repeated overhead jump-float serves, common in volleyball players, required high effort and induced clinically meaningful muscular fatigue that was not perceived by the participant. Significant changes were observed in IF MPF and percent change and effect size suggest that a meaningful change occurred in LT MPF related to jump-float serving.
LEVEL OF EVIDENCE
背景
长时间重复性地过度使用手臂，如在排球发球过程中，与过度使用损伤有关。
目的
研究重复进行跳飘发球后冈下肌和下斜方肌激活情况的变化。
研究设计
描述性队列研究。
方法
6名无症状的美国大学体育协会（NCAA）一级联赛女子排球运动员（年龄=19.2±1.1岁，身高=182.9±2.5厘米，体重=82.1±12.2千克）在NCAA规定的室内排球场上，分13组进行87次跳飘发球，每组7次。肌电图（EMG）电极连接到TeleMyo DTS无线传感器，DTS EMG导联以1000Hz采样。因变量包括冈下肌（IF）和下斜方肌（LT）的中位功率频率（MPF），以及主观用力程度分级（RPE）、使用Borg量表测量的感知疲劳和心率（HR）。进行配对t检验以检查第1组（第1 - 3次发球）和第13组（第85 - 87次发球）之间变量的差异。计算Pearson's r相关系数以检查所有13组中因变量之间的关系。
结果
从第1组到第13组，IF MPF出现了显著且具有临床意义的下降，表明肌肉疲劳。从第1组到第13组，LT MPF的下降虽无统计学意义，但符合临床意义标准且效能不足。RPE与感知疲劳密切相关（r = 0.889，P < 0.01），RPE与HR也密切相关（r = 0.679，P < 0.01），HR与疲劳同样密切相关（r = 0.631，P < 0.01）。IF MPF与LT MPF弱相关（r = 0.227，P < 0.05）。LT MPF与RPE弱相关（r = 0.352，P < 0.01）、与感知疲劳弱相关（r = 0.313，P < 0.01）、与HR弱相关（r = 0.322，P < 0.01）。
结论
排球运动员常见的重复过头跳飘发球需要付出高强度努力，并引发了具有临床意义的肌肉疲劳，而参与者并未察觉到这种疲劳。IF MPF出现了显著变化，百分比变化和效应量表明与跳飘发球相关的LT MPF也发生了有意义的变化。
证据水平
2级。
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