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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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AGE-RELATED, SITE-SPECIFIC MUSCLE LOSS IN 1507 JAPANESE MEN AND WOMEN AGED 20 TO 95 YEARS |
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Takashi Abe1  ,
Mikako Sakamaki1, Tomohiro Yasuda1, Michael G. Bemben1,
Masakatsu Kondo3, Yasuo Kawakami4 and Tetsuo Fukunaga5 |
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1Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Japan, 2Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA, 3Nihon University, Tokyo, Japan, 4Waseda University, Tokorozawa, Japan, and 5National Institute of Fitness and Sports in Kanoya, Kanoya, Japan |
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© Journal of Sports Science and Medicine (2011) 10, 145 - 150 |
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| ABSTRACT | |||
| We investigated the relationship between age and muscle size in
both the appendicular and trunk regions of 1507 Japanese men and women aged
20 to 95 years. Seven hundred twenty-two men (young [aged 20-39 years],
n = 211; middle-aged [aged 40-59 years], n = 347; and old [aged 6095 years],
n = 164) and 785 women (young, n = 207; middle-aged, n = 341; and old, n
= 237) were recruited for this cross-sectional study. Muscle thickness (MTH)
and subcutaneous fat thickness (FTH) were measured by ultrasound at 8 sites
on the anterior and posterior aspects of the body. MTH was expressed in
terms relative to limb length (MTH/L) or height (MTH/Ht). Percent body fat
was estimated from FTH, and fat-free mass (FFM) was calculated. In men,
a graded decrease in FFM was found in all age groups. In women, FFM was
similar in the young and middle-aged groups, but was lower in the oldest
group. Age was significantly and inversely correlated with FFM in men (r
= - 0.358, p < 0.01), but not in women (r = -0.08). On the other hand,
age was strongly and inversely correlated with quadriceps MTH/L (men, r
= -0.529; women, r = -0.489; both p < 0.001) and abdomen MTH/Ht (men,
r = -0.464; women, r = -0.446; both p < 0.001) in both men and women,
while there were only weak correlations between age and other lower limb
and trunk sites. Our results indicated that sarcopenia is observed as a
site-specific loss of skeletal muscle mass, especially for the quadriceps
and abdominal muscles, in Japanese men and women aged 20 to 95 years. Key words: Sarcopenia, muscle distribution, daily physical activity. |
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