Loiselle D S, Walmsley B
Am J Physiol. 1982 Nov;243(5):C242-6. doi: 10.1152/ajpcell.1982.243.5.C242.
The energy cost (determined myothermically) and mean stress (force per cross-sectional area) development of soleus muscles from adult rats were determined. Muscles were stimulated at various frequencies from 0.25 to 100 Hz over a 4-s interval, and the resulting stress-time integral was averaged over this period to yield a total heat vs. mean stress relation. This relation was characterized by three zones, i.e., 1) a linear zone corresponding to unfused twitches, 2) an intermediate zone corresponding to partial fusion during the relaxation phase only, and 3) a second linear zone corresponding to partially and fully fused tetani. The energy cost of mean stress development in the twitch zone was about four times higher than that of the fusion zone. The results are discussed in terms of the firing frequencies at which motor unit recruitment occurs in mammalian slow-twitch muscles.
测定了成年大鼠比目鱼肌的能量消耗（通过肌温测定）和平均应力（单位横截面积的力）发展情况。在4秒的时间间隔内，以0.25至100Hz的不同频率刺激肌肉，并在此期间对产生的应力-时间积分进行平均，以得出总热量与平均应力的关系。这种关系的特征在于三个区域，即：1）对应于未融合单收缩的线性区域；2）仅对应于舒张期部分融合的中间区域；3）对应于部分和完全融合强直收缩的第二个线性区域。单收缩区域中平均应力发展的能量消耗比融合区域高约四倍。根据哺乳动物慢肌运动单位募集时的放电频率对结果进行了讨论。
