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目的比较骑车运动中以不同踩踏频率进行不同负荷强度运动时对于踩踏力量与下肢作用肌激发模式的影响。方法 12名健康成年男性在实验第1阶段以渐增负荷法测得各受试者的踏车运动最大稳定输出功率(poweroutput at VO2max,POV),实验第2阶段以平衡次序法进行3种不同运动强度(50%,65%,80%POV)与3种踩踏频率(60,75,90 r/min)的踏车运动测验,并分别记录9种实验情境中踩踏力量与下肢肌电图的变化。结果不同运动测验中,踩踏力量的负功随着踩踏频率的增加而上升,当曲柄角度在270°的位置时,踩踏合力随回转速的上升平均会增加1.84倍,且踩踏切线作用力峰值明显提前;整体而言,下肢肌群激活率会随踩踏频率的增加而上升。结论在未受自行车训练者中,踩踏频率为影响踩踏力量以及肌电结果的主要因素,踩踏作用力的作用趋势会随着踩踏频率的增加而前移,亦会随着踩踏频率的增加使力量输出曲线平滑化,且3种运动强度的结果相近。以整体踩踏效益而言,未受训练者较佳的踩踏回转速为60 r/min。
Objective To compare the effects of treadmill strength and muscular excitement mode of lower extremity on bicycle treadmill exercise with different load-intensity motions. Methods Twelve healthy adult males were tested for the power output at VO2max (POV) during the first phase of the experiment with increasing load method. The second phase of the experiment was performed in three different ways (50%, 65%, 80% POV) and three treadmill treadmill test (60,75,90 r / min), and recorded the treadmill power and lower extremity electromyogram Variety. Results In different exercise tests, the negative power of pedaling force increased with the increase of pedaling frequency. When the crank angle was at 270 °, the total pedaling force increased 1.84 times with the increase of revolving speed, and the peak value of stepping tangent force was obvious Early; overall, the rate of muscle activation in the lower limbs increases as the frequency of pedaling increases. Conclusion Among bicycle-less trainers, the frequency of pedaling is a major factor affecting the pedaling force and electromyographic outcome. The pedaling force tends to move forward with increasing pedaling frequency. As the pedaling frequency increases, the strength The output curve is smoothed, and the results of the three exercise intensities are similar. In terms of overall stampede, untrained tramps have a better riding speed of 60 r / min.