Study on the Back-muscle-strength from the Viewpoint of Physical Fitness. : Report 4. On the Relations between Back-muscle-strength by the Rope-typed Dynamometer and the other Physical Strength and the Physique of Senior High school students.

Abstract

Back-muscle-strength of senior high school students were measured by the "rope" type dynamometer deviced by the author. The relations among the back muscle-strength, physical fitness and physique,. were studied. The resutls obtained were here as follows : 1) Correlations between back-muscle-strength and height and weight were rather high especially in 15 and 16 years of boys, and chest-of girth are highest in 16 and 17 years of boys. 2) Correlations between back-muscle-strength and height are high in 15 and 16 years of girls and, highest correlations between back-muscle-strength and height were shown in 15 and 16 years of girls, and weight and chest of girth in 16 and 17 of girls. 3) Back-muscle-strength measured by rope type dynamometer were increase in advance with age in case of boys but in case of girls early maturity stage were shown in back-muscle-strength. 4) It was revealed that there is no significant correlations between the back-muscle-strength measured by the rope type dynamometer and other back-muscle-strength measured by KYS type dynamoter in both sexes.