Abstract：
:To clarify whether the resting background effects (genomic) or exercise-related action (non-genomic) of aldosterone (ALD) is primarily affected to an individual variation in the sweat Na+ concentration ([Na+]sweat), we analyzed the cross-sectional relationship between [Na+]sweat and the plasma ALD concentration during rest and exercise in a hot environment. Eleven college-aged male subjects with a mean maximal oxygen uptake of 48 (range 42-59) ml kg-1 min-1 performed three sessions of 20-min cycle exercise at two levels of intensity (40 or 60% VO2max) in a room maintained at 31 degrees C. The chest sweat rate (SRch) and its containing Na+ were higher and individual differences in SRch and [Na+]sweat were greater at 60% exercise than at 40% exercise. In each individual, the [Na+]sweat increased significantly (P<0.05) with the increase in the SRch. In all subjects, the mean [Na+]sweat during exercise correlated negatively with the resting plasma ALD level at either percentage, but it did not correlate with the exercising ALD. These results suggest that individual variations in the increase of the [Na+]sweat in response to a rise in the SRch may thus be more closely related to the resting ALD than to the exercising ALD. As a result, the genomic action of ALD may be affected more by the sweat Na+ variation than by the rapidly non-genomic action during exercise in humans.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Yoshida T,Shin-ya H,Nakai S,Yorimoto A,Morimoto T,Suyama T,Sakurai Mdoi
10.1007/s00421-006-0295-5subject
Has Abstractpub_date
2006-11-01 00:00:00pages
466-71issue
5eissn
1439-6319issn
1439-6327journal_volume
98pub_type
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