Circadian rhythms in human performance

Rutenfranz, J.; Wp, Colquhoun

doi:10.5271/sjweh.3090

Cited by 40 publications

(12 citation statements)

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“…Several investigations have revealed that physical or athletic performance may also be in¯uenced by circadian¯uctuations. For example, isometric strength appears to be greater in the afternoon than in the morning (Coldwells et al 1994;Rutenfranz and Colquhoun 1979). More complex athletic skills such as swimming performance also appear to be aected by the time of day at which they are performed .…”

Section: Introductionmentioning

confidence: 90%

Chronobiological effects on exercise performance and selected physiological responses

Deschenes

Sharma

Brittingham

et al. 1998

European Journal of Applied Physiology

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Previous studies investigating the impact of circadian rhythms on physiological variables during exercise have yielded conflicting results. The purpose of the present investigation was to examine maximal aerobic exercise performance, as well as the physiological and psychophysiological responses to exercise, at four different intervals (0800 hours, 1200 hours, 1600 hours, and 2000 hours) within the segment of the 24-h day in which strenuous physical activity is typically performed. Ten physically fit, but untrained, male university students served as subjects. The results revealed that exercise performance was unaffected by chronobiological effects. Similarly, oxygen uptake, minute ventilation and heart rate showed no time of day influences under pre-, submaximal, and maximal exercise conditions. Ratings of perceived exertion were unaffected by time of day effects during submaximal and maximal exercise. In contrast, rectal temperature exhibited a significant chronobiological rhythm under all three conditions. Under pre- and submaximal exercise conditions, significant time of day effects were noted for respiratory exchange ratio, while a significant rhythmicity of blood pressure was evident during maximal exercise. However, none of these physiological variables exhibited significant differential responses (percent change from pre-exercise values) to the exercise stimulus at any of the four time points selected for study. Conversely, resting plasma lactate levels and lactate responses to maximal exercise were found to be significantly sensitive to chronobiological influences. Absolute post-exercise plasma norepinephrine values, and norepinephrine responses to exercise (percent change from pre-exercise values), also fluctuated significantly among the time points studied. In summary, these data suggest that aerobic exercise performance does not vary during the time frame within which exercise is normally conducted, despite the fact that some important physiological responses to exercise do fluctuate within that time period.

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Section: Introductionmentioning

confidence: 90%

Chronobiological effects on exercise performance and selected physiological responses

Deschenes

Sharma

Brittingham

et al. 1998

European Journal of Applied Physiology

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“…N o signi® cant diOEerences in illness ratings, symptom scores or vomiting occurrence were observed between morning (n = 39) and afternoon (n = 17) journey departures, or between journey departures grouped in 3 h time divisions, a resolution suggested to demonstrate the presence of circadian physiological and psychological processes (Rutenfranz and Colquhoun 1979).…”

Section: Otion Sickness In Public Road Transportmentioning

confidence: 99%

Motion sickness in public road transport: passenger behaviour and susceptibility

Turner

Griffin²

1999

Ergonomics

129

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The aim of this research was to identify personal and environmental factors influencing individual susceptibility to motion sickness during road transport. A questionnaire survey of 3256 coach travellers was conducted. Information on passenger characteristics, travel regularity, activity during travel, use of anti-motion sickness drugs and self-reported motion sickness susceptibility were collected over 56 private hire coach journeys. Details of the travel environment (visibility, temperature and seating) were also recorded. The relationship of these variables with passenger illness and more specific symptoms of motion sickness are examined. Overall, 28.4% of passengers reported feeling ill, 12.8% reported nausea and 1.7% reported vomiting during coach travel. Travel sickness decreased with increasing passenger age and greater travel experience. Females were more likely to report feeling ill during coach travel than males by a ratio of four to three. Poor forward visibility was found to increase sickness. Passenger illness occurrence was approximately three times higher for passengers with no view of the road ahead (mean, 34.6%) compared to passengers who could see the road ahead extremely well (mean, 12.7%). No relationships were found between the occurrence of travel sickness and temperature or time of travel. Differences in the pattern of sickness responses exhibited by coach travellers suggest: (1) habituation through greater travel regularity may occur independently of reductions in travel sickness that occur with age; (2) females are more affected by poor forward visibility than males; and (3) the incidence of travel sickness could be significantly reduced by improving the external visibility afforded to passengers.

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“…"Unmasking" of an inherent rhythm under the influence of accumulating fatigue due to sleep loss might explain the increased amplitude of the circadian component from the first to the third day of sleep deprivation. Rutenfranz and Colquhoun (1979) noted that performance rhythms appear to be related to the daily cycle of sleep "need" and the largest decrements are noted when the need is greater.…”

Section: Curve Topology: Amplitirdementioning

confidence: 99%

Selected Problems of Analysis and Interpretation of the Effects of Sleep Deprivation on Temperature and Performance Rhythms

Babkoff

Mikulincer

Caspy

et al. 1992

Annals of the New York Academy of Sciences

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One of the major methodological-analytic problems encountered by researchers in sleep deprivation involves the examination and analysis of the relationship between sleep loss and rhythmic influences on performance. The comparison of performance rhythms with physiological rhythms, e.g., body temperature, generated under the same conditions of sleep deprivation, has become an important means of testing for an endogenous source of the rhythmicity in the data and for clarifying the nature of the proposed oscillator system. Should the data sets be correlated before or after their separation into monotonic and rhythmic parts? Correlating the raw data without separating them into their components can yield negative results, while, in reality, some of the major underlying rhythms may be highly related. The example used in this chapter showed strong cross correlations of the circadian components of temperature and two performance tasks. Sleep deprivation is thus seen to interact with performance rhythms. This interaction is only revealed after the data are analyzed and broken into their component parts. This procedure leads to the conclusion that certain performance rhythms and temperature may share the same generating oscillators.

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Circadian rhythms in human performance

Cited by 40 publications

References 0 publications

Chronobiological effects on exercise performance and selected physiological responses

Chronobiological effects on exercise performance and selected physiological responses

Motion sickness in public road transport: passenger behaviour and susceptibility

Selected Problems of Analysis and Interpretation of the Effects of Sleep Deprivation on Temperature and Performance Rhythms

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