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Orthostatism and heat acclimation.
J Appl Physiol. 1975 Oct; 39(4):590-5.JA

Abstract

Three groups of subjects (6 subj in each group) underwent the following precedures: group A was given a 20-min head-up tilt at 21 degrees C followed by 4 h of exercise at 33.9 degrees C DB, 32.2 degrees C WB, and a repetition of tilting after exercise in heat; group B underwent the same procedure at 21 degrees C; group C was tilted at 21 degrees C, rested in heat for 4 h and was retilted in heat. The above procedures were repeated for 8 days, and on the last day groups B and C underwent the same treatment as group A. Group A showed the usual decreases in heart rate and rectal temperature and an increase in sweat rate on acclimation. This corresponded to marked improvements in heat-orthostatism. While five subjects in group A fainted during post-exposure tilting on the first exposure, none fainted on the last day. Resting in heat (group C) did not cause any acclimation to work in heat. This corresponded to poor heat-orthostatism after the work-heat procedure when five subjects fainted. Mild training at 21 degrees C (group B) resulted in minor improvements to work in heat as evident by some improvements in heart rate responses after the 1st and 2nd h of exposure. This corresponded to better heat-orthostatism and fewer men fainting than in group C. The results indicated that heat-orthostatism improves on acclimation to the same extent as exercise heart rate and rectal temperature.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

1194150

Citation

Shvartz, E, et al. "Orthostatism and Heat Acclimation." Journal of Applied Physiology, vol. 39, no. 4, 1975, pp. 590-5.
Shvartz E, Strydom NB, Kotze H. Orthostatism and heat acclimation. J Appl Physiol. 1975;39(4):590-5.
Shvartz, E., Strydom, N. B., & Kotze, H. (1975). Orthostatism and heat acclimation. Journal of Applied Physiology, 39(4), 590-5.
Shvartz E, Strydom NB, Kotze H. Orthostatism and Heat Acclimation. J Appl Physiol. 1975;39(4):590-5. PubMed PMID: 1194150.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Orthostatism and heat acclimation. AU - Shvartz,E, AU - Strydom,N B, AU - Kotze,H, PY - 1975/10/1/pubmed PY - 1975/10/1/medline PY - 1975/10/1/entrez SP - 590 EP - 5 JF - Journal of applied physiology JO - J Appl Physiol VL - 39 IS - 4 N2 - Three groups of subjects (6 subj in each group) underwent the following precedures: group A was given a 20-min head-up tilt at 21 degrees C followed by 4 h of exercise at 33.9 degrees C DB, 32.2 degrees C WB, and a repetition of tilting after exercise in heat; group B underwent the same procedure at 21 degrees C; group C was tilted at 21 degrees C, rested in heat for 4 h and was retilted in heat. The above procedures were repeated for 8 days, and on the last day groups B and C underwent the same treatment as group A. Group A showed the usual decreases in heart rate and rectal temperature and an increase in sweat rate on acclimation. This corresponded to marked improvements in heat-orthostatism. While five subjects in group A fainted during post-exposure tilting on the first exposure, none fainted on the last day. Resting in heat (group C) did not cause any acclimation to work in heat. This corresponded to poor heat-orthostatism after the work-heat procedure when five subjects fainted. Mild training at 21 degrees C (group B) resulted in minor improvements to work in heat as evident by some improvements in heart rate responses after the 1st and 2nd h of exposure. This corresponded to better heat-orthostatism and fewer men fainting than in group C. The results indicated that heat-orthostatism improves on acclimation to the same extent as exercise heart rate and rectal temperature. SN - 0021-8987 UR - https://www.unboundmedicine.com/medline/citation/1194150/Orthostatism_and_heat_acclimation_ L2 - https://medlineplus.gov/guidetogoodposture.html DB - PRIME DP - Unbound Medicine ER -