Zainuddin Zainal, Hope Peter, Newton Mike, Sacco Paul, Nosaka Kazunori
Edith Cowan University, Joondalup, Western Australia, Australia.
J Athl Train. 2005 Jul-Sep;40(3):197-202.
Short-term strict immobilization of the arm using a cast enhances recovery of muscle function after eccentric exercise.
To determine if placing one arm in a sling ("light" immobilization) for 4 days after eccentric exercise of the elbow flexor muscles would reduce muscle soreness and enhance recovery compared with the exercised but not immobilized contralateral arm.
Subjects performed 10 sets of 6 maximal isokinetic (90 degrees x s(-1)) eccentric actions of the elbow flexors of each arm on a Cybex dynamometer, separated by 2 weeks.
University laboratory.
Ten healthy subjects (5 men and 5 women) with no history of upper arm injury or resistance training.
INTERVENTION(S): One randomly assigned arm was placed in a sling for 4 days after the 30-minute postexercise measurement to secure the elbow joint at 90 degrees ; the contralateral arm received no treatment. The subject removed the sling when showering and sleeping and during postexercise measurements.
MAIN OUTCOME MEASURE(S): We used an activity monitor to record upper arm activity before and after immobilization. We also compared changes in maximal isometric and isokinetic voluntary strength, range of motion, upper arm circumference, plasma creatine kinase activity, and muscle soreness during 7 days postexercise between arms with a 2-way, repeated-measures analysis of variance.
Eccentric exercise resulted in large losses in both isometric and isokinetic maximal voluntary contraction forces (approximately 40%), reduced range of motion (approximately 20%), increased arm circumference (approximately 10 mm), elevated plasma creatine kinase activity (approximately 2000 IU x L(-1)), and development of delayed-onset muscle soreness. No significant differences were noted between conditions for any measure except upper arm circumference, which increased significantly less for the immobilization than the control arm at 7 days postexercise (P < .05).
Light immobilization had no effect on enhancing recovery of muscle function and delayed-onset muscle soreness after eccentric-exercise-induced muscle damage.
使用石膏对手臂进行短期严格固定可增强离心运动后肌肉功能的恢复。
确定在肘部屈肌进行离心运动后，将一只手臂用吊带固定（“轻度”固定）4天，与对侧进行了运动但未固定的手臂相比，是否会减轻肌肉酸痛并促进恢复。
受试者在Cybex测力计上对每只手臂的肘部屈肌进行10组，每组6次最大等速（90度/秒）离心动作，间隔2周。
大学实验室。
10名无上臂损伤或抗阻训练史的健康受试者（5名男性和5名女性）。
在30分钟的运动后测量后，将一只随机分配的手臂用吊带固定4天，使肘关节固定在90度；对侧手臂不进行处理。受试者在洗澡、睡觉和运动后测量时取下吊带。
我们使用活动监测器记录固定前后的上臂活动情况。我们还通过双向重复测量方差分析比较了运动后7天内，双臂之间在最大等长和等速随意肌力、活动范围、上臂围、血浆肌酸激酶活性和肌肉酸痛方面的变化。
离心运动导致等长和等速最大随意收缩力大幅下降（约40%），活动范围减小（约20%），上臂围增加（约10毫米），血浆肌酸激酶活性升高（约2000国际单位/升），并出现延迟性肌肉酸痛。除上臂围外，各测量指标在不同条件下均未发现显著差异，运动后7天时，固定组的上臂围增加幅度明显小于对照组（P <.05）。
轻度固定对离心运动诱导的肌肉损伤后肌肉功能恢复和延迟性肌肉酸痛的改善没有影响。
