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J Appl Physiol 83: 333-337, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 83, No. 2, pp. 333-337, August 1997
EXERCISE AND MUSCLE

Effect of ingested sodium bicarbonate on muscle force, fatigue, and recovery

O. Verbitsky1, J. Mizrahi1, M. Levin1, and E. Isakov2

1 Department of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa 32000; and 2 Loewenstein Rehabilitation Hospital, Raanana 43100, Israel

Received 29 July 1996; accepted in final form 31 March 1997.

Verbitsky, O., J. Mizrahi, M. Levin, and E. Isakov. Effect of ingested sodium bicarbonate on muscle force, fatigue, and recovery. J. Appl. Physiol. 83(2): 333-337, 1997.---The influence of acute ingestion of NaHCO3 on fatigue and recovery of the 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.

functional electrical stimulation; knee torque; isometric contraction; quadriceps femoris; peripheral muscle fatigue

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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