Physical Work Capacity During the Day and at Night

Abstract

The evaluation of the usefulness of two indirect fitness tests, PWC₁₇₀, and a test for predicting the [Vdot] _{o 2}max, >n ths assessment of day-night variations in human physical fitness was the aim of the study. In order to get an objective judgement, the results were compared with the [Vdot] _{o 2}max determined directly in the same subjects by day and at night. It was shown that the physical work capacity evaluated on the basis of [Vdot] _{o 2}max was higher in the day-time while it was not revealed, using the PWC₁₇₀-test and the nomogram of Astrand and Ryhming.