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- Title
Individual variations in nitric oxide synthase-dependent sweating in young and older males during exercise in the heat: role of aerobic power.
- Authors
Tatsuro Amano; Naoto Fujii; Louie, Jeffrey C.; Meade, Robert D.; Kenny, Glen P.
- Abstract
We evaluated the association between aerobic power (defined by peak oxygen consumption; VO2peak) and the contribution of nitric oxide synthase (NOS) to the sweating response in young and older individuals during exercise in the heat. Data from 44 young (24 ± 1 years) and 48 older (61 ± 2 years) males with mean VO2peak of 47.8 ± 2.4 (range, 28.0-62.3) and 39.1 ± 2.3 (range, 26.4-55.7) mLO2 kg-1 min-1, respectively, were compiled from our prior studies. Participants performed two 15-to 30-min bouts of exercise at a fixed rate of metabolic heat production of 400 or 500 W, each separated by 15-20 min recovery in the heat (35°C, relative humidity of 20%). Forearm sweat rate (ventilated capsule technique) was measured at two skin sites that were continuously and simultaneously administered with lactated Ringers solution (Control) or 10 mmol/L NG-nitro-L-arginine methyl ester (L-NAME, nonselective NOS inhibitor) via intradermal microdialysis. Sweat rate during the final 5 min of each exercise bout was lower with L-NAME compared to the Control in both groups (all P < 0.05). The magnitude of the attenuation in sweat rate induced by L-NAME compared to the Control was not correlated with VO2peak (all P ≥ 0.46) while this attenuation was negatively correlated with the sweat rate at the Control in both groups and in both exercise bouts (all P < 0.01, R ≤ -0.43). These results suggest that NOS-dependent sweating is not associated with aerobic power per se, while it becomes evident in individuals who produce larger sweat rates during exercise irrespective of age.
- Subjects
EXERCISE for men; NITRIC-oxide synthases; PHYSIOLOGICAL effects of heat; PERSPIRATION; AEROBIC capacity; PHYSIOLOGY
- Publication
Physiological Reports, 2017, Vol 5, Issue 6, p1
- ISSN
2051-817X
- Publication type
Article
- DOI
10.14814/phy2.13208