Physiotherapy Department, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Am J Sports Med. 2010 Apr;38(4):824-8. doi: 10.1177/0363546509354056. Epub 2010 Feb 5.
The high incidence of ankle sprains that occur later in matches suggests that fatigue may contribute to altered neuromuscular control of the ankle. Moreover, deficits in ankle joint position sense (JPS) were seen in patients with a history of recurrent ankle sprains. It has been hypothesized that ankle sprains may be related to altered ankle JPS as a consequence of fatigue.
To evaluate if fatiguing contractions of evertor muscles alter the ankle JPS.
Controlled laboratory study.
Thirty-six soccer players (age, 24.7 +/- 1.3 years; height, 183.7 +/- 8.2 cm; weight, 78.9 +/- 7.9 kg) were recruited. Subjects were asked to recognize 2 positions (15 degrees of inversion and maximal active inversion minus 5 degrees ) for 2 conditions: normal and fatigue. Muscular fatigue was induced in evertor muscles of the dominant leg by using isometric contractions. The average of the absolute and variable errors of 3 trials were recorded for both fatigue and nonfatigue conditions. A matched control group of 36 soccer players (age, 23.9 +/- 0.9 years; height, 181.2 +/- 6.9 cm; weight, 77.8 +/- 6.5 kg) was asked to recognize the same positions, before a soccer match and after 45 minutes of playing, and their same scores were recorded. Finally, results of the 2 groups were compared.
There was significant decrease in subjects' ability to recognize passive and active repositioning of their ankle after a fatigue protocol (P <.001). Passive and active JPS were reduced after playing (P <.001). There was no significant difference between 2 groups in the results of JPS before and after the intervention (P > .1).
The acuity of the ankle JPS is reduced subsequent to a fatigue protocol and after a soccer match.
Evaluation of athletes' ankle JPS before returning to physical activity may prevent further injuries.
比赛后期踝关节扭伤的高发表明疲劳可能会导致踝关节的神经肌肉控制发生改变。此外，有踝关节反复扭伤病史的患者会出现踝关节关节位置觉（JPS）缺陷。有人假设，踝关节扭伤可能与疲劳导致的踝关节 JPS 改变有关。
评估外展肌疲劳收缩是否会改变踝关节 JPS。
对照实验室研究。
招募了 36 名足球运动员（年龄 24.7±1.3 岁；身高 183.7±8.2cm；体重 78.9±7.9kg）。要求受试者在正常和疲劳两种情况下识别 2 个位置（15 度外翻和最大主动外翻减去 5 度）。通过使用等长收缩来诱导优势腿外展肌的肌肉疲劳。记录 3 次试验的绝对误差和可变误差的平均值，分别为疲劳和非疲劳两种情况。然后让 36 名足球运动员（年龄 23.9±0.9 岁；身高 181.2±6.9cm；体重 77.8±6.5kg）的对照组在足球赛前和 45 分钟比赛后识别相同的位置，并记录他们的相同得分。最后，比较两组的结果。
在疲劳方案后，受试者识别被动和主动踝关节重新定位的能力明显下降（P<0.001）。在比赛后，被动和主动 JPS 均降低（P<0.001）。在干预前后，2 组的 JPS 结果之间无显著差异（P>.1）。
疲劳方案和足球赛后，踝关节 JPS 的敏锐度降低。
在恢复体育活动之前评估运动员的踝关节 JPS 可能会预防进一步的损伤。
