Verbitsky O, Mizrahi J, Levin M, Isakov E
Department of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
J Appl Physiol (1985). 1997 Aug;83(2):333-7. doi: 10.1152/jappl.1997.83.2.333.
The influence of acute ingestion of NaHCO3 on fatigue and recovery of teh quadriceps femoris muscle after exercise was studied in six healthy male subjects. A bicycle ergometer was used for exercising under three loading conditions: test A, load corresponding to maximal oxygen consumption; test B, load in test A + 17%; test C, load in test B but performed 1 h after acute ingestion of NaHCO3. Functional electrical stimulation (FES) was applied to provoke isometric contraction of the quadriceps femoris. The resulting knee torque was monitored during fatigue (2-min chronic FES) and recovery (10-s FES every 10 min, for 40 min). Quadriceps torques were higher in the presence of NaHCO3 (P < 0.05): with NaHCO3 the peak, residual, and recovery (after 40 min) normalized torques were, respectively, 0.68 +/- 0.05 (SD), 0.58 +/- 0.05, and 0.73 +/- 0.05; without NaHCO3 the values were 0.45 +/- 0.04, 0.30 +/- 0.06, and 0.63 +/- 0.06. The increased torques obtained after acute ingestion of NaHCO3 indicate the possible existence of improved nonoxidative glycolysis in isometric contraction, resulting in reduced fatigue and enhanced recovery.
在六名健康男性受试者中研究了急性摄入碳酸氢钠对运动后股四头肌疲劳及恢复的影响。使用自行车测力计在三种负荷条件下进行运动：测试A，对应最大耗氧量的负荷；测试B，测试A的负荷+17%；测试C，测试B的负荷，但在急性摄入碳酸氢钠1小时后进行。应用功能性电刺激（FES）诱发股四头肌等长收缩。在疲劳（2分钟慢性FES）和恢复过程（每10分钟进行10秒FES，共40分钟）中监测由此产生的膝关节扭矩。在有碳酸氢钠存在时股四头肌扭矩更高（P<0.05）：有碳酸氢钠时，峰值、残余和恢复（40分钟后）标准化扭矩分别为0.68±0.05（标准差）、0.58±0.05和0.73±0.05；无碳酸氢钠时，数值分别为0.45±0.04、0.30±0.06和0.63±0.06。急性摄入碳酸氢钠后获得的扭矩增加表明在等长收缩中可能存在改善的非氧化糖酵解，导致疲劳减轻和恢复增强。
