Department of Physiotherapy, Polytechnic Health Institute of the North, R. Central de Gandra, Gandra, Portugal.
Muscle Nerve. 2011 Aug;44(2):217-20. doi: 10.1002/mus.22018. Epub 2011 Apr 12.
Muscle fatigue could have a greater impact on position sense when antagonists of the movement are fatigued. Hence, this study aimed to compare the effects of antagonist and agonist exercise-induced muscle fatigue on knee joint position sense.
This within-subjects repeated-measures study included 40 subjects. Knee position sense and muscle strength were measured before and after two exercise protocols consisting of 30 consecutive maximal concentric/eccentric contractions of the knee extensors or flexors on the isokinetic dynamometer at an angular velocity of 180°/s (3.14 rad/s).
Both exercise protocols increased the absolute angular error (F(1.78) = 39.89, P < 0.001; knee extensors protocol from 2.0 ± 1.3° to 3.5 ± 2.0°, knee flexors protocol from 2.1 ± 1.2° to 3.7 ± 2.2°), and no differences were detected between protocols (F(1.78) = 0.034, P = 0.855). No changes were observed in the relative angular error.
Muscle fatigue affects knee position sense, and the deleterious effect is not different depending upon the muscle group fatigued.
当运动的拮抗剂疲劳时，肌肉疲劳可能会对位置感产生更大的影响。因此，本研究旨在比较拮抗剂和激动剂运动引起的肌肉疲劳对膝关节位置感的影响。
本研究为单组内重复测量研究，共纳入 40 名受试者。在两种运动方案（在等速测力仪上以 180°/s（3.14 rad/s）的角速度进行 30 次连续最大向心/离心膝关节伸肌或屈肌收缩）前后，分别测量膝关节位置感和肌肉力量。
两种运动方案均增加了绝对角度误差（F(1.78) = 39.89，P < 0.001；伸膝方案从 2.0 ± 1.3°增加到 3.5 ± 2.0°，屈膝方案从 2.1 ± 1.2°增加到 3.7 ± 2.2°），但方案之间无差异（F(1.78) = 0.034，P = 0.855）。相对角度误差无变化。
肌肉疲劳会影响膝关节位置感，且其有害影响与疲劳的肌肉群无关。
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