| Co-Investigator(Kenkyū-buntansha) |
UEZATO Tomomi Uni. of the Ryukyus, Faculty of Medicine, Assistant, 医学部, 助手 (90151779)
NORIMATSU Hiromitsi College of the Kagawa, Faculty of Medicine, Professor, 医学部, 教授 (00156241)
IBARAKI. Kunio Uni. of the Ryukyus, Faculty of Medicine, Professor, 医学部, 教授 (00107187)
TAKARA Hiroaki Uni. of the Ryukyus, Faculty of Medicine, Professor (90101493)
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| Research Abstract |
Bone mineral density (BMD), physical fitness and physique were measured in habitual exercisers and nonexercisers in students aged from eighteen to twenty-eight years old.
Measurements of bone mineral density were performed with dualphoton absorptiometry and dual photon X-ray at femoral neck, Ward's triangle, trochanteric, 2nd-4th lumber vertebra (L2-L4), head, arms, legs, trunk, ribs, pelvis, spine, total body (T-BMD).
The results of the measurements in the subjects were as follows :
Overall average of men's BMD for femoral neck, Ward's triangle, trochanteric and L2-L4 were 1.06g/cm^2, 1.00g/cm^2, 0.89g/cm^2, 1.28g/cm^2 respectively.
Overall average of women's BMD for femoral neck, Ward's triangle, trochanteric and L2-L4 were 0.97g/cm^2, 0.98g/cm^2, 0.81g/cm^2, 1.20g/cm^2 respectively.
The values of BMD for femoral neck, Ward's triangle, trochanteric, L2-L4 were higher ; and percent increment levels in habitual exercisers than nonexercisers were 14% (t=4.94 P<0.01), 12% (t=3.88 P<0.01), 12%
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(t= 4.24 P<0.01) and 17% (t=9.89 P<0.01) in men and 19% (t=3.79 P<0.01), 20% (t=3.27 P<0.01), 20% (t=3.26 P<0.01) and 8% (t=2.01 P<0.05) in women respectively.
The correlation coefficients of the values between BMD and physique were relatively higher in lean body mass (r=0.422 P<0.01), moderately higher in calf girth (r=0.327 P<0.05) and weight (r=0.323 P<O.05), and lower in body fat (r=0.006 not significant) in men. The correlation coefficients by women were also similar to men.
The correlation coefficients of the values between BMD and physical fitness were relatively higher in grip strength (r=0.612 P<0.01), back strength (r=0.571 P<0.01) and 50m sprint (r=-0.538 P<0.01), and lower in 1500m run (r=-0.215 not significant) in men.
For the exerciser in men, the regression equation was : T-BMD=-0.00856Xhight+0.01027Xweight+0.00335Xleg strength ; r=0.938 ; and P<0.01.
For the exerciser in women, the regression equation was : T-MBD=-0.01259Xgrip strength+0.00614Xleg strength +0.00001XLBM ; r=0.929 ; and P<0.01.
It is suggested from these results that habitual exercise is effective to improve peak bone mass in young men. Less
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