Rhythm of the rectal temperature during a 6-month free-running experiment.

Colin, J.; Timbal, J; Boutelier, C; Houdas, Y; Siffre, Michel

doi:10.1152/jappl.1968.25.2.170

Cited by 36 publications

(17 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…other conditions employed in this experiment, are in agreement with other experimental findings (e.g., Colin et al, 1968). L/D-Slj: The introduction of the monkeys to a condition in which they could regulate their own exposure to light and dark had a pronounced effect on their activity patterns.…”

Section: Resultssupporting

confidence: 91%

See 1 more Smart Citation

Activity cycles of the rhesus monkey(Macaca mulatta)under several experimental conditions, both in isolation and in a group situation∗∗∗

Yellin

Hauty

1971

Journal of Interdisiplinary Cycle Research

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 91%

“…It has been employed with canaries (Wahlström, 1964(Wahlström, , 1965 and white-footed mice (Kavanau, 1967), as well as in human studies (e.g. Colin et al, 1968).…”

Section: Introductionmentioning

confidence: 99%

Activity cycles of the rhesus monkey(Macaca mulatta)under several experimental conditions, both in isolation and in a group situation∗∗∗

Yellin

Hauty

1971

Journal of Interdisiplinary Cycle Research

View full text Add to dashboard Cite

“…It could not account for the behaviour of Group H, which is better fitted by a different model, 'A', rejected by these workers: one in which the oscillator determines the time of arousal from sleep, but the time of retiring to bed is dependent not upon the behaviour of the oscillator but upon some other process such as fatigue. Occasional or repeated activity cycles of around twice the usual circadian duration have been recorded by Aschoff et al (1967a, b), and by Colin et al (1968) as well as by ourselves (Mills, 1967 We may also accept that fatigue sufficient to impel one to retire will inevitably supervene after a sufficient duration of wakefulness.…”

Section: Free-running Circadian Rhythms In Man 581mentioning

confidence: 82%

The circadian rhythms of human subjects without timepieces or indication of the alternation of day and night

Mills¹,

Minors²,

Waterhouse³

1974

The Journal of Physiology

View full text Add to dashboard Cite

1. Seven solitary subjects, and two groups of four, spent from 5 to 13 days in an isolation unit without knowledge of time. Three solitary subjects and one group of four adopted fairly regular activity habits with a period of 25–27 h; one subject adopted a period of 30 h, and one of 27 h initially, decreasing to 24–25 h after a few days. One group of four awoke roughly every 24 h, after a sleep which was alternately about 8 h, or about 4 h and believed by the subjects to be an afternoon siesta. Two solitary subjects alternated sleeps of about 8 or 16 h, separated by 24 h of activity. 2. Deep temperature in all subjects oscillated with a period of 24–26 h, which was thus commonly distinct from their activity habits. 3. Urinary potassium followed a rhythm whose period, though usually close to, was sometimes distinct from, that of temperature. A secondary period corresponding to that of activity was also sometimes present. 4. Urinary sodium and chloride usually gave evidence of two periodic components, one corresponding to activity and the other to the rhythm of either temperature or of urinary potassium. 5. Urinary creatinine and phosphate usually followed the subject's routine of activity. 6. Plasma samples were collected on a few occasions and analysed for phosphate and 11–hydroxycorticosteroids. Changes in plasma phosphate were usually, but not always, associated with similar changes in urinary phosphate, and changes in plasma corticosteroids were often, but not always, associated with similar changes in urinary potassium shortly afterwards. 7. Observations are recorded on a subject alone in a cave for 127 days. His activity habits, though wildly variable, gave evidence of a period of 25·1 h and his urinary electrolyte excretion indicated a shorter period, of 24·6 h. During the following 3 days, when he remained in the cave but was visited frequently, his plasma corticosteroids and urinary potassium oscillated with a period of 16 h. 8. The possible mechanisms controlling these rhythms are discussed.

show abstract

“…1) with an acrophase in the late afternoon, close to 18:00 hours (Waterhouse et al, 1993). This circadian rhythm is mainly endogenous and persists in free-living conditions, without the influence of the zeitgebers (Colin et al, 1968).…”

Section: Circadian Rhythms and Time-of-day Effect On Performance In Nmentioning

confidence: 98%

Different effects of heat exposure upon exercise performance in the morning and afternoon

Racinais

2010

Scandinavian Med Sci Sports

View full text Add to dashboard Cite

Independent of environmental conditions, rectal temperature follows a circadian rhythm with an acrophase in the late afternoon. In neutral environment, this diurnal increase in temperature is believed to have a passive warm-up effect improving muscle contractility, and in turn, muscle force, power and performance. However, a hot environment blunts the diurnal variation in muscle function by only improving muscle contractility, and in turn, muscle force, power and performance in the morning, when body temperature is at its lowest. Despite this diurnal variation in muscle function, long-duration exercise is only slightly affected by the timeof-day in neutral environment. However, higher afternoon body temperatures can reduce the heat storage capacity and result in a reduction in exercise capacity in hot environments. In addition, in parallel to the circadian variations in muscle contractility and central temperature, exercise capacity in hot environment may also be affected by the diurnal variations in melatonin concentration and in the onset of peripheral vasodilatation and sweating.Research examining the effect of hot environments on physical abilities have generally focused on central temperature (e.g., rectal or esophageal) and the preservation of the homeostasis. However, even in a thermally comfortable and neutral environment, body temperatures are not stable physiological parameters. As most of the biological variables in both animal and vegetable species, rectal temperature follows biological rhythms. The first part of this review describes the circadian rhythm in rectal temperature and its effect on performance. Then, the repercussions of the diurnal variation in both temperature and performance are addressed when exercising in hot environments. The other biological rhythms potentially influencing exercise capacity in hot environment are briefly presented in a third part.Circadian rhythms and time-of-day effect on performance in neutral environment Generality on circadian rhythms and time-of-day

show abstract

Rhythm of the rectal temperature during a 6-month free-running experiment.

Cited by 36 publications

References 0 publications

Activity cycles of the rhesus monkey(Macaca mulatta)under several experimental conditions, both in isolation and in a group situation∗∗∗

Activity cycles of the rhesus monkey(Macaca mulatta)under several experimental conditions, both in isolation and in a group situation∗∗∗

The circadian rhythms of human subjects without timepieces or indication of the alternation of day and night

Different effects of heat exposure upon exercise performance in the morning and afternoon

Contact Info

Product

Resources

About