人类拇收肌不同类型收缩活动的代谢成本。

The metabolic costs of different types of contractile activity of the human adductor pollicis muscle.

Newham D J, Jones D A, Turner D L, McIntyre D

Physiotherapy Group, Division of Biomedical Sciences, Kings College London, UK.

J Physiol. 1995 Nov 1;488 ( Pt 3)(Pt 3):815-9. doi: 10.1113/jphysiol.1995.sp021013.

The metabolic costs and physiological consequences of shortening contractions of a human muscle working in situ have been compared with those of the muscle maintaining a continuous isometric contraction and when performing repeated brief isometric contractions. 2. After a total of 10 s stimulation, the shortening and intermittent brief isometric protocols had very similar effects, causing a 30% loss of force and a threefold increase in the half-time of relaxation. This was in contrast to the continuous isometric contraction protocol where there was less than 10% loss of force or slowing of relaxation. 3. The ATP cost over the first 5 s of the continuous isometric protocol was 27 mmol (l intracellular water)-1 while for the shortening and repeated brief isometric protocols the costs were 48 and 46 mmol (l intracellular water)-1, respectively. 4. The results show that shortening and repeated brief isometric contractions are considerably more energetically demanding, and hence more fatiguing, than sustained isometric contractions.

已将原位工作的人体肌肉缩短收缩的代谢成本和生理后果，与保持持续等长收缩以及进行重复短暂等长收缩的肌肉的代谢成本和生理后果进行了比较。2. 在总共10秒的刺激后，缩短收缩和间歇性短暂等长收缩方案具有非常相似的效果，导致力量损失30%，松弛半衰期增加三倍。这与持续等长收缩方案形成对比，在持续等长收缩方案中，力量损失小于10%，松弛也没有减慢。3. 持续等长收缩方案前5秒的ATP消耗为27 mmol（每升细胞内液），而缩短收缩和重复短暂等长收缩方案的消耗分别为48和46 mmol（每升细胞内液）。4. 结果表明，与持续等长收缩相比，缩短收缩和重复短暂等长收缩在能量需求上要高得多，因此更容易疲劳。

The metabolic costs of different types of contractile activity of the human adductor pollicis muscle.