| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Kuniaki Nagasaki University School of Medicine, Professor, 医学部, 教授 (80039536)
TAHARA Yasuaki Nagasaki University Faculty of education, Professor, 教育学部, 教授 (20039788)
MATSUMOTO Tomoko Nagasaki University Hospital, Assistant, 医学部・附属病院, 助手 (30239107)
OHKI Masafumi Kyushu Univ.School of Health Science, Professor, 医療技術短期大学部, 教授 (10160441)
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| Research Abstract |
We investigated whether physical exercise had effects to increase bone mass or to reduce decrease of bone mass in the various menstrual status.
40 volleyball women players were divided into 4 groups according to the menstrual status ; 13 pre-, 7 pen-, 12 early post-, and 8 late post-menopausal women. 89 healthy women were the control (13, 11, 23, and 12, respectively). The measurement of bone mineral density (BMD) of the lumbar spine and calcaneus using dual X-ray absorptiometry (DXA) and the tibia using peripheral quantitative computed tomography and quantitative ultrasound (QUS) of the calcaneus were annually performed three times.
The initial bone measurementswere higher in the player group. The pre-menopausal players showed significantly higher BMD in cortical dominant site and larger cortical bone area, higher moment of inertia than in the control, and showed increase of BMD in the cortical component. In the peri- and early post-menopausal status, there were no or minimally signific
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ant differences in the rate of bone loss of the cortical component, while the loss rates of trabecular dominant bone in the high- impact sites were lower in the player group. Most of the initial measurementswere significantly related to YSM and BMI, and the total amount of training showed positive relationship with the spinal BMD, heel BMD, and the tibial cortical area. For the rate of bone loss, BMI showed the significant relationship with the rate of loss of tibial BMD in cortical dominant sites, and YSM showed significant relationship with those of the heel QUS and DXA.The cur rent training hours showed significant relationship to the heel DXA.
In conclusion, the impact-type exercise showed contributions to the highly stored bone mass, especially in the cortical component before menopause, and reduction of menopause-related decrease of bone mass, mainly in the trabecular region of highly impact sites. The estrogen, exercise and body mass index showed different relationship depending on the skeletal sites. Less
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