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The Effects of Different Treadmill Running Periods on Bone Mechanical Strength in Ovariectomized Mice Akira MINEMATSU 1 , Osamu YOSHIMURA 2 1Department of Physical Therapy, Faculty of Health Science, Kio University 2Hiroshima City Rehabilitation Center Keyword: 卵巣摘出マウス(ovariectomized mice) , トレッドミル走行期間(the period of treadmill running) , 機械的骨強度(bone mechanical strength) pp.459-463
Published Date 2008/7/18
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Abstract : This study investigated how different treadmill running periods effected bone mechanical strength in ovariectomized mice. Eighty female ICR mice aged 12-weeks-old were used. All mice were divided into 8 groups (n=10) randomly, and had either a sham-operation (n=10) or an ovariectomy (n=70). The SHAM group and one OVX group (NR) were used as non-running control groups, with the remainder comprising the treadmill running groups : the LA (8 m/min), MA (16 m/min), and HA (24 m/min) groups which ran for 12 weeks, and the LB (8 m/min), MB (16 m/min), HB (24 m/min) groups which ran for 6 weeks for 25 min on 5 days/week. After this experiment, maximum loads for the femur and tibia were measured by three-pointed bending test, and the bone mechanical strength of the bones was calculated. Also, the dry bone weight and ash content of the bones were measured. Maximum femur and tibia load and bone mechanical strength were affected by running speed and term significantly. Maximum load and bone mechanical strength of tibia were shown as an interaction. Bone mechanical strength in all running groups was higher than that in the NR group, significantly. This study suggested that treadmill running prevented a reduction of bone mechanical strength, and that treadmill running was most effective in the LA and MA groups (running at low and medium speed and for a long period).


Copyright © 2008, The Japanese Association of Rehabilitation Medicine. All rights reserved.

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電子版ISSN 印刷版ISSN 1881-3526 日本リハビリテーション医学会

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