On the Relationship between Motor Activity and the Sleep-Wake Cycle in Humans during Temporal Isolation

Author:

Aschoff Jürgen1

Affiliation:

1. Max-Planck-Institut für Verhaltensphysiologie, D-8138 Andechs, Germany

Abstract

In the free-running circadian rhythms of 14 human subjects (4 females, 10 males) who lived singly in an isolation unit without temporal clues, locomotor activity was recorded by means of contact plates installed below the carpet in the main room. During sleep, movements in bed were picked up by spring contacts attached to the mattress. In all subjects, the hourly means of locomotion during wakefulness (α) were negatively correlated with the duration of α to such an extent that the total amount of locomotion per cycle remained constant when α varied from 14 to 23 hr. The hourly values of movements in bed were independent of the duration of sleep (p), so that the total number of movements was almost proportional to p. The "homeostatic control" of locomotion during wake time is considered as a means to conserve energy when the duration of wakefulness increases.

Publisher

SAGE Publications

Subject

Physiology (medical),Physiology

Reference24 articles.

1. Aschoff, J. (1962) Spontane lokomotorische Aktivität. In Handbuch der Zoologie, Vol. 8, Part 2, J. G. Helmcke, H. von Lengerken, and D. Stark, eds., pp. 2-76, De Gruyter, Berlin .

2. Features of Circadian Rhythms Relevant for the Design of Shift Schedules

3. . Aschoff, J. (1981). Circadian rhythms: Interdependence with and dependence on work-rest schedules In Advances in Sleep Research, Vol. 7, Biological Rhythms, Sleep and Shift Work , L. C. Johnson, D. I. Tepas, W. P. Colquhoun, and M. J. Colligan, eds., pp. 11-34, Spectrum, New York.

4. . Aschoff, J. (1985b) Time perception and timing of meals during temporal isolation In Circadian Clocks and Zeitgebers , T. Hiroshige and K. Honma, eds., pp. 3-18, Hokkaido University Press, Sapporo.

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