We examined the influence of exercise on lactate concentration on the skin surface of working muscle. A plastic container with 100μl 1% ethanol was put on the skin surface of the belly of rectus femoris muscle. The workloads were 360, 720, 900 and 990 (or 1080) kpm/min and each stage was 5 min in duration. Sample collections were performed at rest, during exercise, and recovery.
　The skin surface lactate concentration during exercise significantly increased compared to the basal level (p<0.05 or p<0.001). The skin lactate concentration at five minutes after exercise was significantly hight compared with the basal level (p<0.01). Skin surface lactate concentration was found to correlate significantly with heart rate at the exercise intensity of 360 kpm/min (r=-0.64, p<0.05), 720 kpm/min (r=-0.73, p<0.01) and 900 kpm (r=-0.61, p<0.05). This study confirmed that 1) the increase in lactate concentration on the skin surface of working muscle is associated with increase in exercise intensity, and 2) lactate concentration on the skin surface correlated with heart rate at each exercise intensity. From these results it was suggested that skin is useful for the uptake of lactate produced in working muscle.

DESCENTE SPORTS SCIENCE Vol.30/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE