Abstract
The endurance time in the static exercises was measured in 638 male and female subjects, aged 11 to 79 years. Three types of exercises were used in this study : 1) lifting up the load equal to one-third of the maximal back strength, 2) holding the 9 kg of iron bar horizontally by the forward stretched upper extremities, and 3) chinning. Maximal back strength of the young adult females was equal to about 60% of the males. Endurance time in lifting is shorter in females than that in males when the same weight was loaded, however, this was reverse when load corresponding to onethird of the respective maximal back strength was used. Sex differences in endurance time were not observed in puberty and senility, suggesting the hormonal participations in muscular morphology and compositions related to the muscular strength. Endurance times in holding the iron bar and chinning extended with increasing ages. Relations between the endurances of the static exercises and some indices of the nutritional status, especially of breadth growth, were briefly discussed.
