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Exercise and heat orthostatism and the effect of heat acclimation and physical fitness.
Aviat Space Environ Med. 1977 Sep; 48(9):836-42.AS

Abstract

Twelve trained and 16 untrained young men were administered five orthostatic tests while leaning upright against a wall, for 20 min--before exercise; after 60 min of exercise at a load of 40 W; after 15 min of exercise at a load of 80 W; after a Vo2 max test, and after 3 h of exercise at a load of 40 W in heat (39.4 degrees C DB, 30.3 degrees C WB). Eight of the untrained subjects were retested in the five orthostatic tests after 8 d of heat acclimation. The number of fainters in the orthostatic tests administered before exercise, after exercise at 40 W and 80 W, and after exercise in heat, were 3, 4, 6, and 13, respectively. There were no fainting episodes after the Vo2 max tests. Orthostatic responses in the different conditions were partially related. The trained subjects showed substantially better responses than the untrained ones (10% vs. 25% of fainting episodes), and heat acclimation resulted in marked improvement in orthostatism (decrease to 5% faintings). The results show that Vo2 max and heat tolerance account for most of the variability which determines orthostatic tolerance.

Authors

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Pub Type(s)

Journal Article

Language

eng

PubMed ID

907595

Citation

Shvartz, E, et al. "Exercise and Heat Orthostatism and the Effect of Heat Acclimation and Physical Fitness." Aviation, Space, and Environmental Medicine, vol. 48, no. 9, 1977, pp. 836-42.
Shvartz E, Meroz A, Magazanik A, et al. Exercise and heat orthostatism and the effect of heat acclimation and physical fitness. Aviat Space Environ Med. 1977;48(9):836-42.
Shvartz, E., Meroz, A., Magazanik, A., Shoenfeld, Y., & Shapiro, Y. (1977). Exercise and heat orthostatism and the effect of heat acclimation and physical fitness. Aviation, Space, and Environmental Medicine, 48(9), 836-42.
Shvartz E, et al. Exercise and Heat Orthostatism and the Effect of Heat Acclimation and Physical Fitness. Aviat Space Environ Med. 1977;48(9):836-42. PubMed PMID: 907595.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Exercise and heat orthostatism and the effect of heat acclimation and physical fitness. AU - Shvartz,E, AU - Meroz,A, AU - Magazanik,A, AU - Shoenfeld,Y, AU - Shapiro,Y, PY - 1977/9/1/pubmed PY - 1977/9/1/medline PY - 1977/9/1/entrez SP - 836 EP - 42 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 48 IS - 9 N2 - Twelve trained and 16 untrained young men were administered five orthostatic tests while leaning upright against a wall, for 20 min--before exercise; after 60 min of exercise at a load of 40 W; after 15 min of exercise at a load of 80 W; after a Vo2 max test, and after 3 h of exercise at a load of 40 W in heat (39.4 degrees C DB, 30.3 degrees C WB). Eight of the untrained subjects were retested in the five orthostatic tests after 8 d of heat acclimation. The number of fainters in the orthostatic tests administered before exercise, after exercise at 40 W and 80 W, and after exercise in heat, were 3, 4, 6, and 13, respectively. There were no fainting episodes after the Vo2 max tests. Orthostatic responses in the different conditions were partially related. The trained subjects showed substantially better responses than the untrained ones (10% vs. 25% of fainting episodes), and heat acclimation resulted in marked improvement in orthostatism (decrease to 5% faintings). The results show that Vo2 max and heat tolerance account for most of the variability which determines orthostatic tolerance. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/907595/Exercise_and_heat_orthostatism_and_the_effect_of_heat_acclimation_and_physical_fitness_ L2 - https://medlineplus.gov/guidetogoodposture.html DB - PRIME DP - Unbound Medicine ER -