Changes of Muscular Strength Associated to Growth
- VernacularTitle:発育に伴う筋力の変化について
- Author:
M. Ono
- Publication Type:Journal Article
- From:Japanese Journal of Physical Fitness and Sports Medicine
1965;14(3):85-97
- CountryJapan
- Language:Japanese
-
Abstract:
In order to invesigate the changes in volitional muscular strength associated to the human growth, the five repetitive measures of maximal grip strength and the abilities of lifting the barbells in “curl” and “press” were examined.
1) Considerable differences associated to sex and age were observed in the decrement rate of the repeated grip strength. As the greatest rate of decrement was recorded for the ages from 14 to 23 years, it was considered that this decrement was due to the variation in the integrating mechanism of the contractile forces involving the nervous system or the fatigue of this mechanism, rather than the fatigue of the muscle itself.
2) The difference in ability of “press” between the two sexes became greater in accrodance with the advance in age. However, the improvement in the ability showed a linear increment both for the boys and girls, and there observed no particular stage in the course of development.
3) Up until age of 10 years, there was no difference in the ability of “curl”, which is associated to the sex, and the increment was linear. After the age of 11 years, the increment was accelerated both for the boys and girls. The ability in “curl” approached to that of “press” in boys, whereas, the ability in “curl” in the case of the girls exeeded that of “press.” The static muscular strength of the girls seemed to be considerably greater than the level assumed by the popular belief.
4) From the observations of the upper arm position in the “press” motion, the muscular development seemed to proceed from the trunk to the extremities. In this connection, the age around 8 or 9 years can be regarded as the period during which the muscular development is completed in some extent.
5) Among the boys younger than the age of 10 years, a great number of the boys failed to maintain their elbows at the right angle for a period of 5 seconds, after they “curl” the weight in the position. It was speculated that the balance between the “active” strength and the “passive” strength in muscles is established some time around the age of 10 years.
