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Collapse of sustained long standing.

Thirty female physical education students of age 21-22 and 20 middle aged or elderly men and women of age 30-66 were required to keep an upright standing posture without any support for one hour. The posture was free from rigidity or tenseness. The physical, physiological and motion characteristics were compared between those who could sustain the standing posture for one hour and those who could not. Of the 50 subjects, 9 quit the posture and 5 fainted or collapsed. The subjects who collapsed were relatively tall and had less foot width. Their head sway increased and their respiratory rate decreased with time, the changes becoming apparent within 20 min of standing. Immediately prior to the collapse, the head sway was maximal and respiratory rate and heart rate decreased markedly. Spontaneous physical movements also increased in this stage. These changes contrasted remarkably with those of subjects who could sustain this posture for the full one hour. Thus the clearest difference was shown in physiological pa rameters during standing.