Wells R, Morrissey M, Hughson R
Eur J Appl Physiol Occup Physiol. 1986;55(3):295-301. doi: 10.1007/BF02343802.
Internal mechanical work during cycling, required to raise and lower the legs and change their velocities, is shown to be an important factor when interpreting physiological responses to cycle ergometer exercise. The internal work required to move the legs during concentric and eccentric cycle ergometry at different speeds and workloads was calculated from segmental energy changes determined using cinematography and directly using an eccentric ergometer. The mean internal work rates obtained at pedal frequencies of 30, 60 and 90 min-1 were 11.5, 20 and 62 W respectively. When these estimates were added to the external work rates, they increased concentric and decreased eccentric work rates. The largest differences were seen at low work rates and high pedal frequencies during which concentric work rates increased by 51% and eccentric decreased 60% by the inclusion of internal work. When comparisons of concentric and eccentric cycling at equal uncorrected work rates were made, neglecting to include internal work introduced errors ranging from 12 to 97%. The calculated estimates of internal work agreed well with the power supplied by the eccentric ergometer to move the legs passively. The investigations show that the inclusion of internal work is important when comparing physiological responses during concentric and eccentric ergometry, especially when pedal frequencies exceed 60 min-1 and when work rates are small.
在骑行过程中，抬高和放下腿部以及改变其速度所需的内部机械功，在解释对自行车测力计运动的生理反应时被证明是一个重要因素。在不同速度和负荷下，通过使用电影摄影术确定的节段能量变化以及直接使用偏心测力计，计算出在同心和偏心自行车测力计运动中移动腿部所需的内部功。在踏板频率为30、60和90次/分钟时获得的平均内部功率分别为11.5、20和62瓦。当将这些估计值加到外部功率上时，它们增加了同心运动的功率并降低了偏心运动的功率。在低功率和高踏板频率下差异最大，在此期间，通过纳入内部功，同心运动功率增加了51%，偏心运动功率降低了60%。当在相等的未校正功率下比较同心和偏心骑行时，忽略纳入内部功会引入12%至97%的误差。计算得出的内部功估计值与偏心测力计被动移动腿部所提供的功率非常吻合。研究表明，在比较同心和偏心测力计运动期间的生理反应时，纳入内部功很重要，特别是当踏板频率超过60次/分钟且功率较小时。
