The Relationship of Temperature to Strength and Power Production in Intact Human Skeletal Muscle

摘要

Eight male subjects volunteered to participate in a study to determine the relationship between variations in Tm and the characteristics of strength and power development in intact muscle. The subjects were studied under control and four experimental conditions, two active warm-up conditions (W-A and W-B) and two passive warm-up conditions (heating and cooling). Each subject was tested on the Cybex II isokinetic testing device at four lever arm speeds (0,60,180 and 300/sec). Maximal knee extensions at the different lever arm speeds were evaluated for peak torque, 30 torque and time to constant velocity. A fatigue test was evaluated by percent decline and by analysis of the power output at specific time intervals. Mean peak torque, 30 torque and time to constant velocity values were significantly different (p < .05) in the W-A and W-B conditions as compared to the control condition for all lever arm speeds except 300/sec. Temperature alteration, passive or active, resulted in no significant change (p < .05) in the percent decline as determined by the fatigue test. Evaluation of the power output of the fatigue test indicated that passive cooling significantly (p < .05) lowered the power output compared to all other conditions. Interval analysis showed varied reductions of power caused by the different conditions. It was concluded that the significant changes found with active warm-up were not a Q10 effect, but rather the result of neuromuscular alteration in direct response to actual activity. (Author)