Effect of low-repetition jump training on bone mineral density in young women.
The hypothesis of the present study was that low-repetition and high-impact training of 10 maximum vertical jumps/day, 3 times/wk would be effective for improving bone mineral density (BMD) in ordinary young women. Thirty-six female college students, with mean age, height, and weight of 20.7+/-0.7 yr, 158.9+/-4.6 cm, and 50.4+/-5.5 kg, respectively, were randomly divided into two groups: jump training and a control group. After the 6 mo of maximum vertical jumping exercise intervention, BMD in the femoral neck region significantly increased in the jump group from the baseline (0.984+/-0.081 vs. 1.010+/-0.080 mg/cm2; P<0.01), although there was no significant change in the control group (0.985+/-0.0143 vs. 0.974+/-0.134 mg/cm2). And also lumbar spine (L2-4) BMD significantly increased in the jump training group from the baseline (0.991+/-0.115 vs. 1.015+/-0.113 mg/cm2; P<0.01), whereas no significant change was observed in the control group (1.007+/-0.113 vs. 1.013+/-0.110 mg/cm2). No significant interactions were observed at other measurement sites, Ward's triangle, greater trochanter, and total hip BMD. Calcium intakes and accelometry-determined physical daily activity showed no significant difference between the two groups. From the results of the present study, low-repetition and high-impact jumps enhanced BMD at the specific bone sites in young women who had almost reached the age of peak bone mass.
Kato
Takeru
T
Department of Clinical Nutrition, Faculty of Health Science, Suzuka Univ. of Medical Science, Kishioka, 1001-1, Suzuka 510-0293, Japan. t-kato@suzuka-u.ac.jp
Terashima
Toru
T
Yamashita
Takenori
T
Hatanaka
Yasuhiko
Y
Honda
Akiko
A
Umemura
Yoshihisa
Y
D015502:Absorptiometry, Photon; D000328:Adult; D000375:Aging / Q000502:physiology*; D000596:Amino Acids / Q000652:urine; D000704:Analysis of Variance; D015519:Bone Density / Q000502:physiology*; D001862:Bone Resorption / Q000503:physiopathology; D002118:Calcium / Q000032:analysis; D002136:Calcium, Dietary / Q000378:metabolism; D015444:Exercise / Q000502:physiology*; D005260:Female; D005272:Femur Neck / Q000737:chemistry / Q000502:physiology; D006801:Humans; D008159:Lumbar Vertebrae / Q000737:chemistry / Q000502:physiology
D000596:Amino Acids; D002136:Calcium, Dietary; C036020:deoxypyridinoline; D002118:Calcium