人类进行10秒和20秒最大冲刺运动期间及恢复过程中的功率输出与肌肉代谢。
Power output and muscle metabolism during and following recovery from 10 and 20 s of maximal sprint exercise in humans.
作者信息
Bogdanis G C, Nevill M E, Lakomy H K, Boobis L H
机构信息
Department of Physical Education, Sports Science and Recreation Management, Loughborough University, Leicestershire, England, UK.
出版信息
Acta Physiol Scand. 1998 Jul;163(3):261-72. doi: 10.1046/j.1365-201x.1998.00378.x.
On two separate days eight male subjects performed a 10- or 20-s cycle ergometer sprint (randomized order) followed, after 2 min of recovery, by a 30-s sprint. Muscle biopsies were obtained from the vastus lateralis at rest, immediately after the first sprint and after the 2 min of recovery on both occasions. The anaerobic ATP turnover during the initial 10 s of sprint 1 was 129 +/- 12 mmol kg dry weight-1 and decreased to 63 +/- 10 mmol kg dry weight-1 between the 10th and 20th s of sprint 1. This was a result of a 300% decrease in the rate of phosphocreatine breakdown and a 35% decrease in the glycolytic rate. Despite this 51% reduction in anaerobic ATP turnover, the mean power between 10 and 20 s of sprint 1 was reduced by only 28%. During the same period, oxygen uptake increased from 1.30 +/- 0.15 to 2.40 +/- 0.23 L min-1, which partially compensated for the decreased anaerobic metabolism. Muscle pH decreased from 7.06 +/- 0.02 at rest to 6.94 +/- 0.02 after 10 s and 6.82 +/- 0.03 after 20 s of sprinting (for all changes P < 0.01). Muscle pH did not change following a 2-min recovery period after both the 10- and 20-s sprints, but phosphocreatine was resynthesized to 86 +/- 3 and 76 +/- 3% of the resting value, respectively (n.s. 10- vs. 20-s sprint). Following 2 min of recovery after the 10-s sprint subjects were able to reproduce peak but not mean power. Restoration of both mean and peak power following the 20-s sprint was 88% of sprint 1, and was lower compared with that after the 10-s sprint (P < 0.01). Total work during the second 30-s sprint after the 10- and the 20-s sprint was 19.3 +/- 0.6 and 17.8 +/- 0.5 kJ, respectively (P < 0.01). As oxygen uptake was the same during the 30-s sprints (2.95 +/- 0.15 and 3.02 +/- 0.16 L min-1), and (Phosphocreatine) before the sprint was similar, the lower work may be related to a reduced glycolytic ATP regeneration as a result of the higher muscle acidosis.
在两个不同的日子里，8名男性受试者进行了10秒或20秒的自行车测力计冲刺（随机顺序），恢复2分钟后，接着进行30秒的冲刺。在休息时、第一次冲刺后即刻以及两次冲刺恢复2分钟后，从股外侧肌获取肌肉活检样本。冲刺1最初10秒内的无氧ATP周转率为129±12 mmol·kg干重⁻¹，在冲刺1的第10秒至20秒之间降至63±10 mmol·kg干重⁻¹。这是磷酸肌酸分解速率下降300%和糖酵解速率下降35%的结果。尽管无氧ATP周转率降低了51%，但冲刺1第10秒至20秒之间的平均功率仅降低了28%。在此期间，摄氧量从1.30±0.15升·分钟⁻¹增加到2.40±0.23升·分钟⁻¹，这部分补偿了无氧代谢的下降。肌肉pH值从休息时的7.06±0.02在冲刺10秒后降至6.94±0.02，20秒后降至6.82±0.03（所有变化P<0.01）。在10秒和20秒冲刺后的2分钟恢复期后，肌肉pH值没有变化，但磷酸肌酸分别重新合成至静息值的86±3%和76±3%（10秒与20秒冲刺相比无显著差异）。在10秒冲刺后的2分钟恢复期后，受试者能够重现峰值功率但不能重现平均功率。20秒冲刺后的平均功率和峰值功率恢复至冲刺1的88%，与10秒冲刺后相比更低（P<0.01）。在10秒和20秒冲刺后的第二次30秒冲刺期间，总功分别为19.3±0.6和17.8±0.5 kJ（P<0.01）。由于30秒冲刺期间的摄氧量相同（2.95±0.15和3.02±0.16升·分钟⁻¹），且冲刺前的（磷酸肌酸）相似，较低的功可能与较高的肌肉酸中毒导致糖酵解ATP再生减少有关。
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