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The effect of contraction type on muscle strength, work and fatigue in maximal isokinetic exercise

机译：收缩方式对最大等速运动中肌肉力量，工作和疲劳的影响

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This study investigated knee extensor muscle strength, work and fatigue level under maximal isokinetic concentric and eccentric exercise. Seventeen male athletes were randomized into two groups and performed 10 sets of 10 maximal isokinetic concentric (N = 8) or eccentric (N = 9) contractions. Knee extensor peak torque and mean torque values per set were 54-121% and 53-133% higher in eccentric compared to concentric exercise, respectively, whereas the percent fall of performance in these variables was more accentuated in concentric exercise. Total work was significantly higher in eccentric exercise (19475 J) than concentric exercise (15758 J), while fatigue index was greater in concentric (36%) than eccentric (18%) exercise. In conclusion, maximal isokinetic eccentric exercise promotes larger overload to knee extensor muscles than its concentric counterpart due to higher torque produced by the muscle group and also thanks to minor muscle fatigue effects.
机译：这项研究调查了最大等速同心和离心运动下膝关节伸肌的力量，工作和疲劳程度。 17名男运动员被随机分为两组，并进行10组10次最大等速同心（N = 8）或离心运动（N = 9）收缩。与同心运动相比，偏心运动的每组伸膝肌峰值扭矩和平均扭矩值分别高54-121％和53-133％，而在同心运动中，这些变量的表现下降百分比则更为突出。偏心运动（19475 J）的总工作量显着高于同心运动（15758 J），而同心运动（36％）的疲劳指数大于偏心运动（18％）。总之，由于肌肉群产生更高的扭矩，并且由于轻微的肌肉疲劳效应，最大等速离心运动比同心离心运动对膝伸肌产生更大的过载。

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