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Moderate exercise increases postexercise thresholds for vasoconstriction and shivering.
J Appl Physiol (1985). 1998 Oct; 85(4):1357-61.JA

Abstract

The purpose of this study was to evaluate the effect of exercise on the subsequent postexercise thresholds for vasoconstriction and shivering. On two separate days, with six subjects (3 women), a whole body water-perfused suit slowly decreased mean skin temperature (approximately 7.0 degreesC/h) until thresholds for vasoconstriction and shivering were clearly established. Subjects were then rewarmed by increasing water temperature until both esophageal and mean skin temperatures returned to near-baseline values. Subjects either performed 15 min of cycle ergometry (65% maximal O2 consumption) followed by 30 min of recovery (Exercise) or remained seated with no exercise for 45 min (Control). Subjects were then cooled again. We mathematically compensated for changes in skin temperatures by using the established linear cutaneous contribution of skin to the control of vasoconstriction and shivering (20%). The calculated core temperature threshold (at a designated skin temperature of 30.0 degreesC) for vasoconstriction increased significantly from 36.64 +/- 0.20 to 36.89 +/- 0.22 degreesC postexercise (P < 0.01). Similarly, the shivering threshold increased from 35.73 +/- 0.13 to 36.13 +/- 0.12 degreesC postexercise (P < 0.01). In contrast, sequential measurements, without exercise, demonstrate a time-dependent decrease in both the vasoconstriction (0.10 degreesC) and shivering (0.12 degreesC) thresholds. These data indicate that exercise has a prolonged effect by increasing the postexercise thresholds for both cold thermoregulatory responses.

Authors+Show Affiliations

Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, Ontario K1N 6N5. gkenny.uottawa.caNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9760328

Citation

Kenny, G P., et al. "Moderate Exercise Increases Postexercise Thresholds for Vasoconstriction and Shivering." Journal of Applied Physiology (Bethesda, Md. : 1985), vol. 85, no. 4, 1998, pp. 1357-61.
Kenny GP, Chen AA, Nurbakhsh BA, et al. Moderate exercise increases postexercise thresholds for vasoconstriction and shivering. J Appl Physiol (1985). 1998;85(4):1357-61.
Kenny, G. P., Chen, A. A., Nurbakhsh, B. A., Denis, P. M., Proulx, C. E., & Giesbrecht, G. G. (1998). Moderate exercise increases postexercise thresholds for vasoconstriction and shivering. Journal of Applied Physiology (Bethesda, Md. : 1985), 85(4), 1357-61.
Kenny GP, et al. Moderate Exercise Increases Postexercise Thresholds for Vasoconstriction and Shivering. J Appl Physiol (1985). 1998;85(4):1357-61. PubMed PMID: 9760328.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Moderate exercise increases postexercise thresholds for vasoconstriction and shivering. AU - Kenny,G P, AU - Chen,A A, AU - Nurbakhsh,B A, AU - Denis,P M, AU - Proulx,C E, AU - Giesbrecht,G G, PY - 1998/10/7/pubmed PY - 1998/10/7/medline PY - 1998/10/7/entrez SP - 1357 EP - 61 JF - Journal of applied physiology (Bethesda, Md. : 1985) JO - J Appl Physiol (1985) VL - 85 IS - 4 N2 - The purpose of this study was to evaluate the effect of exercise on the subsequent postexercise thresholds for vasoconstriction and shivering. On two separate days, with six subjects (3 women), a whole body water-perfused suit slowly decreased mean skin temperature (approximately 7.0 degreesC/h) until thresholds for vasoconstriction and shivering were clearly established. Subjects were then rewarmed by increasing water temperature until both esophageal and mean skin temperatures returned to near-baseline values. Subjects either performed 15 min of cycle ergometry (65% maximal O2 consumption) followed by 30 min of recovery (Exercise) or remained seated with no exercise for 45 min (Control). Subjects were then cooled again. We mathematically compensated for changes in skin temperatures by using the established linear cutaneous contribution of skin to the control of vasoconstriction and shivering (20%). The calculated core temperature threshold (at a designated skin temperature of 30.0 degreesC) for vasoconstriction increased significantly from 36.64 +/- 0.20 to 36.89 +/- 0.22 degreesC postexercise (P < 0.01). Similarly, the shivering threshold increased from 35.73 +/- 0.13 to 36.13 +/- 0.12 degreesC postexercise (P < 0.01). In contrast, sequential measurements, without exercise, demonstrate a time-dependent decrease in both the vasoconstriction (0.10 degreesC) and shivering (0.12 degreesC) thresholds. These data indicate that exercise has a prolonged effect by increasing the postexercise thresholds for both cold thermoregulatory responses. SN - 8750-7587 UR - https://www.unboundmedicine.com/medline/citation/9760328/Moderate_exercise_increases_postexercise_thresholds_for_vasoconstriction_and_shivering_ L2 - https://journals.physiology.org/doi/10.1152/jappl.1998.85.4.1357?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -