Circadian variation of thermoregulatory responses during exercise in rats

H. Tanaka, M. Yanase, Kazuyuki Kanosue, T. Nakayama

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Rats exercised on a treadmill at daytime lows and nighttime highs of circadian change in body temperature at two different work intensities [40 and 60% of maximal oxygen uptake (V̇O2(max))] with the ambient temperature (T(a)) at 24°C. Immediately before exercise at 60% V̇O2(max), rectal temperature (T(re)) was 0.7°C higher at night than during the day. During the exercise, T(re) rose more during the day than at night, and T(re) at the end of exercise was the same in the day as at night. Threshold T(re) for tail vasodilation did not differ between day and night. Similar tendencies of T(re) change and tail vasomotor response were observed at a work intensity of 40% V̇O2(max), except that the rise in T(re) was smaller than at the higher work intensity. On the other hand, threshold T(re) for tail vasodilation spontaneously occurring in resting rats in a warm environment (T(a) of 28°C) was 0.7°C higher at night than during the day. In conclusion, exercise in rats attenuates the differences in deep body temperature and threshold T(re) for tail vasodilation seen between day and night.

Original languageEnglish
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume258
Issue number4 27-4
Publication statusPublished - 1990
Externally publishedYes

Fingerprint

Tail
Vasodilation
Temperature
Body Temperature Changes
Body Temperature
Oxygen

Keywords

  • body temperature
  • circadian rhythm
  • tail vasomotor response
  • temperature regulation
  • treadmill running

ASJC Scopus subject areas

  • Physiology

Cite this

Circadian variation of thermoregulatory responses during exercise in rats. / Tanaka, H.; Yanase, M.; Kanosue, Kazuyuki; Nakayama, T.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 258, No. 4 27-4, 1990.

Research output: Contribution to journalArticle

@article{fbc9f3bf0c9641ad8b761725535ec47b,
title = "Circadian variation of thermoregulatory responses during exercise in rats",
abstract = "Rats exercised on a treadmill at daytime lows and nighttime highs of circadian change in body temperature at two different work intensities [40 and 60{\%} of maximal oxygen uptake (V̇O2(max))] with the ambient temperature (T(a)) at 24°C. Immediately before exercise at 60{\%} V̇O2(max), rectal temperature (T(re)) was 0.7°C higher at night than during the day. During the exercise, T(re) rose more during the day than at night, and T(re) at the end of exercise was the same in the day as at night. Threshold T(re) for tail vasodilation did not differ between day and night. Similar tendencies of T(re) change and tail vasomotor response were observed at a work intensity of 40{\%} V̇O2(max), except that the rise in T(re) was smaller than at the higher work intensity. On the other hand, threshold T(re) for tail vasodilation spontaneously occurring in resting rats in a warm environment (T(a) of 28°C) was 0.7°C higher at night than during the day. In conclusion, exercise in rats attenuates the differences in deep body temperature and threshold T(re) for tail vasodilation seen between day and night.",
keywords = "body temperature, circadian rhythm, tail vasomotor response, temperature regulation, treadmill running",
author = "H. Tanaka and M. Yanase and Kazuyuki Kanosue and T. Nakayama",
year = "1990",
language = "English",
volume = "258",
journal = "American Journal of Physiology",
issn = "0193-1849",
publisher = "American Physiological Society",
number = "4 27-4",

}

TY - JOUR

T1 - Circadian variation of thermoregulatory responses during exercise in rats

AU - Tanaka, H.

AU - Yanase, M.

AU - Kanosue, Kazuyuki

AU - Nakayama, T.

PY - 1990

Y1 - 1990

N2 - Rats exercised on a treadmill at daytime lows and nighttime highs of circadian change in body temperature at two different work intensities [40 and 60% of maximal oxygen uptake (V̇O2(max))] with the ambient temperature (T(a)) at 24°C. Immediately before exercise at 60% V̇O2(max), rectal temperature (T(re)) was 0.7°C higher at night than during the day. During the exercise, T(re) rose more during the day than at night, and T(re) at the end of exercise was the same in the day as at night. Threshold T(re) for tail vasodilation did not differ between day and night. Similar tendencies of T(re) change and tail vasomotor response were observed at a work intensity of 40% V̇O2(max), except that the rise in T(re) was smaller than at the higher work intensity. On the other hand, threshold T(re) for tail vasodilation spontaneously occurring in resting rats in a warm environment (T(a) of 28°C) was 0.7°C higher at night than during the day. In conclusion, exercise in rats attenuates the differences in deep body temperature and threshold T(re) for tail vasodilation seen between day and night.

AB - Rats exercised on a treadmill at daytime lows and nighttime highs of circadian change in body temperature at two different work intensities [40 and 60% of maximal oxygen uptake (V̇O2(max))] with the ambient temperature (T(a)) at 24°C. Immediately before exercise at 60% V̇O2(max), rectal temperature (T(re)) was 0.7°C higher at night than during the day. During the exercise, T(re) rose more during the day than at night, and T(re) at the end of exercise was the same in the day as at night. Threshold T(re) for tail vasodilation did not differ between day and night. Similar tendencies of T(re) change and tail vasomotor response were observed at a work intensity of 40% V̇O2(max), except that the rise in T(re) was smaller than at the higher work intensity. On the other hand, threshold T(re) for tail vasodilation spontaneously occurring in resting rats in a warm environment (T(a) of 28°C) was 0.7°C higher at night than during the day. In conclusion, exercise in rats attenuates the differences in deep body temperature and threshold T(re) for tail vasodilation seen between day and night.

KW - body temperature

KW - circadian rhythm

KW - tail vasomotor response

KW - temperature regulation

KW - treadmill running

UR - http://www.scopus.com/inward/record.url?scp=0025210619&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025210619&partnerID=8YFLogxK

M3 - Article

C2 - 2331028

AN - SCOPUS:0025210619

VL - 258

JO - American Journal of Physiology

JF - American Journal of Physiology

SN - 0193-1849

IS - 4 27-4

ER -