A cross-sectional study of the size and strength of the thigh muscles in sedentary 259 japanese adults.
- VernacularTitle:日本人成人男女２５９名における大腿部筋群横断面積と筋力の年齢変化について
- Author:
HIRONORI SATO
;
AKIRA MIURA
;
MIKIKO SATO
;
HARUHIKO SATO
;
YOSHIYUKI FUKUBA
- Publication Type:Journal Article
- Keywords:
Muscle cross-sectional area;
Muscle strength;
Ultrasonography;
Aging
- From:Japanese Journal of Physical Fitness and Sports Medicine
1999;48(3):353-364
- CountryJapan
- Language:Japanese
-
Abstract:
Thigh muscle cross-sectional area (CSA) and maximum voluntary isometric strength of knee extensor and flexor muscles were measured in 97 men (2065 years) and 162 women (2069 years) in sedentary Japanese adults. Each subject was assigned to one of five age groups (3rd 4th 5th 6th and 7th decade) . Thigh muscle CSA was estimated by our developmental measuring system using an ultrasonographic device, which was connected to a PC for graphical processing. Muscle CSA for the 7th decade in men was significantly smaller than that for the 3rd decade. For women, muscle CSA were no significant from the 3rd to the 7th decade. The isometric knee extensor strength showed a significant decline with age from the 7th decade in men, whereas there was no significant change with age in women. Isometric strength of knee flexors in men showed a gradual decline from the 5th decade. The aging-associated reduction of muscle strength per muscle CSA in the extensors and flexors started from the 6th decade in men. It was concluded that the size and strength of the thigh muscles begin to decrease simultaneously by approximately the 6th decade in men, whereas there are no change until the 7th decade in women.
