This study investigated the effects of dynamic hand-grip exercise on skin-gas acetone concentration. The subjects for this experiment were seven healthy males. In the first experiment, to ascertain the reproducibility of the results for the skin-gas acetone concentration test, the skin gas was collected four times from one subject. In the second experiment, all subjects performed three different types of exercise (Exercises I-III) for a duration of 60 s. Exercise I was performed at 10 kg with one contraction every 3 s. Exercise II was 30 kg with one contraction every 3 s. Exercise III was 10 kg with one contraction per second. Acetone concentration was analyzed by gas chromatography. In the first experiment, reasonable reproducibility was obtained in measurements of skin-gas acetone concentration during the hand-grip exercise. In the second experiment, acetone concentration in skin gas during hand-grip exercise II was significantly higher than the basal level. Although skin-gas acetone levels increased in all subjects during exercises I and III, a significant difference was not found. No significant difference was found in skin-gas acetone concentration during dynamic hand-grip exercise among exercises I, II, and III. This study confirmed that skin-gas acetone levels increase during dynamic hand-grip exercise.

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Abstract:The present study investigated the effect of dynamic handgrip exercise on acetone, 6-methyl-5-hepten-2-one, acetaldehyde, and hexanal levels in skin gas. Participants in this experiment consisted of six healthy males. Skin gas was collected two times. First, skin gas during rest (i.e., before the exercise) was collected for 3 min into the sampling bag. Next, the exercise using a handgrip exercise instrument was performed.The hand performed a dynamic handgrip exercise for 3 min inside the sampling bag, exerting one 30 kg contraction per second. The blood flow at the end of the handgrip exercise increased by about 1.4 times that before exercise and then decreased to basal levels immediately thereafter. Acetone and 6-methyl-5-hepten-2-one concentrations after exercise significantly increased relative to basal levels. Significant differences were not observed in acetaldehyde and hexanal concentrations between at rest and after handgrip exercise. The amount of acetone and 6-methyl-5-hepten-2-one released from forearm skin increased during dynamic handgrip exercise. Acetaldehyde and hexanal levels did not increase during exercise compared with levels at rest.