Abstract
An observation about height, weight and right mid-upper arm circumference (UAC) of 470 male subjects without apparent diseases was made. The subjects were 150 males at 40-49 years of age, 204 at 50-59 of age, and 116 at 60-69 of age. The weightcorrected UAC was calculated as the following formual.
Weight-corrected UAC (cm) =Measured UAC-0.15 W
where W=±percent weight deviation from the standard.
The weight-corrected UAC was 26.7±0.1 (mean±standard error) cm in subjects aged 40-49, 26.5±0.1 in subjects aged 50-59, and 25.9±0.1 in subjects aged 60-69. The difference between those at 50-59 of age and at 60-69 of age was statistically significant. This decrease is due to the decrease of muscle mass with advancing age. On the basis of these findings it is concluded that the weight-corrected UAC is a good index for body muscle mass and declines with advancing age.
