Futther Studies on the Growth of Japanese Female Youth.

Grip Strength, Vital Capacity and Secndary Sex Characters.

Abstract

Grip strength, vital capacity, development of the mamma and growth of axillary hair were studied. The subjects were the same as in the previous report.
In the average, grip strength is greater in group A than in group B (cf. the previous report as for the classification) in all age levels investigated. It is so in absolute values as well as in relative values of the grip strength related to the stature or to the weight.
Group A reaches the maximum value of grip strength in absolute as well as relative sense at the age of 17 and group B at 18 years, group A preceding group B by a year in the development.
Vital capacity behaves in the same way both absolutely and relatively as mentioned above for the grip strength.
A half of group A acquires the final form of the mamma at the age 14 years 4 months while it is at 15 years 6 months for group B.
A half of group A reaches the final state of axillary hair at the age of 15 years 6 months and it is at 16 years 5 months for group B.
Summing up, group A precedes group B by a year or so in growth and development of the secondary sex characters and physical strength.