title: Influence of cycle exercise on acetone in expired air and skin gas.
abstract: This study investigated the influence of cycle exercise on acetone concentration in expired air and skin gas. The subjects for this experiment were eight healthy males. Subjects performed a continuous graded exercise test on a cycle ergometer. The workloads were 360 (1.0 kg), 720 (2.0 kg), 990 (2.75 kg) kgm/min, and each stage was 5 min in duration. A pedaling frequency of 60 rpm was maintained. Acetone concentration was analyzed by gas chromatography. The acetone concentration in expired air and skin gas during exercise at 990 kgm/min intensity was significantly increased compared with the basal level. The skin-gas acetone concentration at 990 kgm/min significantly increased compared with the 360 kgm/min (P < 0.05). The acetone excretion of expired air at 720 kgm/min and 990 kgm/min significantly increased compared with the basal level (P < 0.05). Acetone concentration in expired air was 4-fold greater than skin gas at rest and 3-fold greater during exercise (P < 0.01). Skin gas acetone concentration significantly related with expired air (r = 0.752; P < 0.01). This study confirmed that the skin-gas acetone concentration reflected that of expired air.
authors.affiliation: Material Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Showa-ku, Nagoya, Japan.
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Yamai
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ohkuwa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Itoh
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Yamazaki
authors.forename: Takao
authors.initials: T
authors.lastname: Tsuda
mesh_terms: D000096:Acetone / Q000032:analysis*; D000293:Adolescent; D000388:Air; D001944:Breath Tests; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D045853:Exhalation; D005740:Gases / Q000737:chemistry*; D006801:Humans; D008297:Male; D012867:Skin / Q000737:chemistry*; D055815:Young Adult
chemical_list: D005740:Gases; D000096:Acetone