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Days

FIGURE 5.41 Daily rhythm of heart rate. The graph shows a 3-day segment of the heart rate records of a mongrel dog (Canis familiaris). Measurements were made by telemetry at hourly intervals. The duration of the prevailing light-dark cycle is indicated by the horizontal light and dark bars. A clear daily rhythm, with high values during the night, can be observed. (Source: Ashkar, E. (1979). Twenty-four-hour pattern of circulation by radiotelemetry in the unrestrained dog. American Journal of Physiology 236: R231-R236.)

Days

FIGURE 5.41 Daily rhythm of heart rate. The graph shows a 3-day segment of the heart rate records of a mongrel dog (Canis familiaris). Measurements were made by telemetry at hourly intervals. The duration of the prevailing light-dark cycle is indicated by the horizontal light and dark bars. A clear daily rhythm, with high values during the night, can be observed. (Source: Ashkar, E. (1979). Twenty-four-hour pattern of circulation by radiotelemetry in the unrestrained dog. American Journal of Physiology 236: R231-R236.)

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