Pincivero D M, Campy R M
Human Performance and Fatigue Laboratory, Department of Kinesiology, The University of Toledo, Toledo, OH 43606, USA.
J Sports Med Phys Fitness. 2004 Jun;44(2):111-8.
The purpose of this study was to examine the effects of rest interval on quadriceps femoris (QF) muscle strength and fatigue during short-term, high-intensity training.
Fifteen healthy males were assessed for isokinetic QF strength, via peak torque (PT), work (WK) and power (PW), at a pre-set angular velocity of 180 deg x s(-1). Quadriceps femoris muscle fatigue was evaluated as the decline in isokinetic work and power (slope) across 30 maximal concentric contractions. Subjects were randomly assigned to 1 of 3 groups: Group 1 (short rest interval), Group 2 (long rest interval), and Group 3 (control-no training). Subjects in Group 1 received a rest period of 40 s in between exercise sets corresponding to a 2:1 rest:work ratio. Subjects in Group 2 received a rest period of 160 s corresponding to an 8:1 rest:work ratio. Groups 1 and 2 performed isokinetic knee extension contractions at 180 deg x s(-1) 2 days per week for 6 weeks.
The results demonstrated a significant increase in QF muscle PT across the 6 week training period in the long rest interval group, and no significant changes in the short rest interval and control groups. Quadriceps femoris muscle work and power were observed to not change significantly across the training period in all 3 groups. The reduction in QF muscle work across the single set of 30 repetitions was observed to decrease significantly in the control group across the 6 week duration; no other significant changes in QF muscle fatigue for work and power were observed.
The major findings of this study suggests that the possibility of different physiological mechanisms of adaptation exist for QF muscle peak torque, work and power, while changes in muscle fatigue resistance may be present when assessed across multiple, rather than a single, bouts of activity.
本研究旨在探讨在短期高强度训练期间，休息间隔对股四头肌（QF）肌力和疲劳的影响。
15名健康男性在预设角速度为180度×秒⁻¹的情况下，通过峰值扭矩（PT）、功（WK）和功率（PW）评估等速股四头肌肌力。股四头肌疲劳通过30次最大向心收缩过程中等速功和功率的下降（斜率）来评估。受试者被随机分为3组中的1组：第1组（短休息间隔）、第2组（长休息间隔）和第3组（对照组 - 无训练）。第1组受试者在每组运动之间休息40秒，对应2:1的休息:工作比例。第2组受试者休息160秒，对应8:1的休息:工作比例。第1组和第2组每周进行2天、为期6周的180度×秒⁻¹等速膝关节伸展收缩。
结果表明，长休息间隔组在6周训练期内股四头肌PT显著增加，短休息间隔组和对照组无显著变化。在所有3组中，整个训练期间股四头肌的功和功率均未观察到显著变化。在6周期间，对照组在单次30次重复过程中股四头肌功的下降显著减少；在功和功率方面，未观察到股四头肌疲劳的其他显著变化。
本研究的主要发现表明，股四头肌峰值扭矩、功和功率可能存在不同的生理适应机制，而在评估多次而非单次活动时，肌肉抗疲劳能力可能会发生变化。
