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Acute hypoosmolality attenuates the suppression of cutaneous vasodilation with increased exercise intensity. | LitMetric

Acute hypoosmolality attenuates the suppression of cutaneous vasodilation with increased exercise intensity.

J Appl Physiol (1985)

Dept. of Sports Medical Sciences, Institute on Aging and Adaptation, Shinshu Univ. Graduate School of Medicine, 3-1-1 Asahi Matsumoto 390-8621, Japan.

Published: September 2005

AI Article Synopsis

  • The study investigated how raising the body core temperature threshold for skin blood flow in the forearm during exercise may be linked to increased plasma osmolality.
  • Eight young males exercised at different intensities while maintaining a constant skin temperature, with varying effects on plasma osmolality based on whether they were in isoosmotic or hypoosmotic conditions.
  • Results showed that changes in the temperature threshold for vasodilation were closely related to changes in plasma osmolality across all trials, suggesting a partial relationship between exercise intensity and plasma osmolality.

Article Abstract

We examined the hypothesis that elevation of the body core temperature threshold for forearm skin vasodilation (TH(FVC)) with increased exercise intensity is partially caused by concomitantly increased plasma osmolality (P(osmol)). Eight young male subjects, wearing a body suit perfused with warm water to maintain the mean skin temperature at 34 +/- 1 degree C (ranges), performed 20-min cycle-ergometer exercise at 30% peak aerobic power (VO2(peak)) under isoosmotic conditions (C), and at 65% VO2(peak) under isoosmotic (H(EX)I(OS)) and hypoosmotic (H(EX)L(OS)) conditions. In H(EX)L(OS), hypoosmolality was attained by hypotonic saline infusion with DDAVP, a V2 agonist, before exercise. P(osmol) (mosmol/kg H2O) increased after the start of exercise in both H(EX) trials (P < 0.01) but not in C. The average P(osmol) at 5 and 10 min in H(EX)I(OS) was higher than in C (P < 0.01), whereas that in H(EX)L(OS) was lower than in H(EX)I(OS) (P < 0.01). The change in TH(FVC) was proportional to that in P(osmol) in every subject for three trials. The change in TH(FVC) per unit change in P(osmol) (deltaTH(FVC)/deltaP(osmol), degrees C x mosmol(-1) x kg H2O(-1)) was 0.064 +/- 0.012 when exercise intensity increased from C to H(EX)I(OS), similar to 0.086 +/- 0.020 when P(osmol) decreased from H(EX)I(OS) to H(EX)L(OS) (P > 0.1). Moreover, there were no significant differences in plasma volume, heart rate, mean arterial pressure, and plasma lactate concentration around TH(FVC) between H(EX)I(OS) and H(EX)L(OS) (P > 0.1). Thus the increase in TH(FVC) due to increased exercise intensity was at least partially explained by the concomitantly increased P(osmol).

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http://dx.doi.org/10.1152/japplphysiol.00156.2005DOI Listing

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