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Role of skin blood flow and sweating rate in exercise thermoregulation after bed rest.
J Appl Physiol (1985). 2002 May; 92(5):2026-34.JA

Abstract

Two potential mechanisms, reduced skin blood flow (SBF) and sweating rate (SR), may be responsible for elevated intestinal temperature (T(in)) during exercise after bed rest and spaceflight. Seven men underwent 13 days of 6 degrees head-down bed rest. Pre- and post-bed rest, subjects completed supine submaximal cycle ergometry (20 min at 40% and 20 min at 65% of pre-bed rest supine peak exercise capacity) in a thermoneutral room. After bed rest, T(in) was elevated at rest (+0.31 +/- 0.12 degrees C) and at the end of exercise (+0.33 +/- 0.07 degrees C). Percent increase in SBF during exercise was less after bed rest (211 +/- 53 vs. 96 +/- 31%; P < or = 0.05), SBF/T(in) threshold was greater (37.09 +/- 0.16 vs. 37.33 +/- 0.13 degrees C; P < or = 0.05), and slope of SBF/T(in) tended to be reduced (536 +/- 184 vs. 201 +/- 46%/ degrees C; P = 0.08). SR/T(in) threshold was delayed (37.06 +/- 0.11 vs. 37.34 +/- 0.06 degrees C; P < or = 0.05), but the slope of SR/T(in) (3.45 +/- 1.22 vs. 2.58 +/- 0.71 mg x min-1 x cm-2 x degrees C-1) and total sweat loss (0.42 +/- 0.06 vs. 0.44 +/- 0.08 kg) were not changed. The higher resting and exercise T(in) and delayed onset of SBF and SR suggest a centrally mediated elevation in the thermoregulatory set point during bed rest exposure.

Authors+Show Affiliations

Wyle Laboratories, Life Sciences Systems and Services Division, Johnson Space Center, Houston, Texas 77058, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

11960954

Citation

Lee, Stuart M C., et al. "Role of Skin Blood Flow and Sweating Rate in Exercise Thermoregulation After Bed Rest." Journal of Applied Physiology (Bethesda, Md. : 1985), vol. 92, no. 5, 2002, pp. 2026-34.
Lee SM, Williams WJ, Schneider SM. Role of skin blood flow and sweating rate in exercise thermoregulation after bed rest. J Appl Physiol (1985). 2002;92(5):2026-34.
Lee, S. M., Williams, W. J., & Schneider, S. M. (2002). Role of skin blood flow and sweating rate in exercise thermoregulation after bed rest. Journal of Applied Physiology (Bethesda, Md. : 1985), 92(5), 2026-34.
Lee SM, Williams WJ, Schneider SM. Role of Skin Blood Flow and Sweating Rate in Exercise Thermoregulation After Bed Rest. J Appl Physiol (1985). 2002;92(5):2026-34. PubMed PMID: 11960954.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Role of skin blood flow and sweating rate in exercise thermoregulation after bed rest. AU - Lee,Stuart M C, AU - Williams,W Jon, AU - Schneider,Suzanne M, PY - 2002/4/19/pubmed PY - 2002/6/22/medline PY - 2002/4/19/entrez KW - NASA Center JSC KW - NASA Discipline Cardiopulmonary SP - 2026 EP - 34 JF - Journal of applied physiology (Bethesda, Md. : 1985) JO - J Appl Physiol (1985) VL - 92 IS - 5 N2 - Two potential mechanisms, reduced skin blood flow (SBF) and sweating rate (SR), may be responsible for elevated intestinal temperature (T(in)) during exercise after bed rest and spaceflight. Seven men underwent 13 days of 6 degrees head-down bed rest. Pre- and post-bed rest, subjects completed supine submaximal cycle ergometry (20 min at 40% and 20 min at 65% of pre-bed rest supine peak exercise capacity) in a thermoneutral room. After bed rest, T(in) was elevated at rest (+0.31 +/- 0.12 degrees C) and at the end of exercise (+0.33 +/- 0.07 degrees C). Percent increase in SBF during exercise was less after bed rest (211 +/- 53 vs. 96 +/- 31%; P < or = 0.05), SBF/T(in) threshold was greater (37.09 +/- 0.16 vs. 37.33 +/- 0.13 degrees C; P < or = 0.05), and slope of SBF/T(in) tended to be reduced (536 +/- 184 vs. 201 +/- 46%/ degrees C; P = 0.08). SR/T(in) threshold was delayed (37.06 +/- 0.11 vs. 37.34 +/- 0.06 degrees C; P < or = 0.05), but the slope of SR/T(in) (3.45 +/- 1.22 vs. 2.58 +/- 0.71 mg x min-1 x cm-2 x degrees C-1) and total sweat loss (0.42 +/- 0.06 vs. 0.44 +/- 0.08 kg) were not changed. The higher resting and exercise T(in) and delayed onset of SBF and SR suggest a centrally mediated elevation in the thermoregulatory set point during bed rest exposure. SN - 8750-7587 UR - https://www.unboundmedicine.com/medline/citation/11960954/Role_of_skin_blood_flow_and_sweating_rate_in_exercise_thermoregulation_after_bed_rest_ DB - PRIME DP - Unbound Medicine ER -