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Related Experiment Videos

Circadian variation in human stature.

T Reilly1, A Tyrrell, J D Troup

  • 1Department of Sport and Recreation Studies, Liverpool Polytechnic, U.K.

Chronobiology International
|January 1, 1984
PubMed
Summary

Human stature experiences daily fluctuations due to spinal compression and recovery. This study monitored height changes over 24 hours, revealing significant daily variations in stature for adult males.

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Area of Science:

  • Human physiology
  • Biomechanical engineering

Background:

  • Human stature exhibits diurnal variations, influenced by gravitational forces and spinal loading.
  • Understanding these changes is crucial for fields ranging from ergonomics to clinical assessments.

Purpose of the Study:

  • To quantify the diurnal creep in stature due to spinal compression.
  • To monitor the recovery of stature over a 24-hour period in adult males.

Main Methods:

  • Utilized a specialized metal frame and a dead-load BAYE micrometer for precise stature measurements (0.01 mm).
  • Implemented accessories for posture standardization and prevention of muscular tension.
  • Recorded stature at nine intervals over 24 hours in eight adult males.

Main Results:

  • A significant circadian rhythm in stature was observed, with a trough-to-peak variation of 19.3 mm (1.1% of total stature).
  • Peak stature occurred upon waking (07:30), with the lowest point at midnight.
  • Significant height loss occurred within the first hour of rising (over 50%), with 80% lost within 3 hours.

Conclusions:

  • The rate of stature change (creep) varies throughout the day, being highest in the morning.
  • Height recovery during sleep is most pronounced in the early hours.
  • Diurnal stature variation is a significant physiological phenomenon influenced by daily activity and sleep patterns.

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