Modulation of Bone Mass and Turnover in Growing Rats by Voluntary Weight-Bearing Exercise and Glucose Supplementation

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概要

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• Female Sprague-Dawley rats, 9 weeks of age, were assigned to four groups: Group 0 (n=8) was dissected for base-line control, and the other three groups were fed for 3 mo: Group 1 (n=9), sedentary controls; Group 2 (n=6), running rats housed in a cage with a treadmill and pair-fed with Group 1; and Group 3 (n=7), running rats, pair-fed and allowed free access to additional glucose. The distances of voluntary running did not significantly differ between Groups 2 and 3. Menstrual cycles in these rats were apparently maintained as observed from daily running distances. The amount of glucose taken by rats in Group 3 was 3.5±0.4 (mean and SE) g/d. Body weight (BW) at the end of the experiment for Groups 1, 2, and 3 were 295.0±7.9, 211.7±5.4 (p<0.001 vs. Group 1), and 259.0±3.5g (p<0.01 vs. Group 2), respectively. The parameters of bone mass such as ash weights of the femur and bone mineral content of the lumbar spine and the tibia in Groups 1 and 2 did not differ, but the values were significantly greater in Group 3 than in Group 2. However, these parameter values corrected for BW were significantly greater in Group 2 than in Group 1 and did not significantly differ between Groups 2 and 3. The parameters of bone formation, such as serum bone alkaline phosphatase activity levels and trabecular bone formation rates corrected for BW, were significantly greater in Group 2 than in Group 1 but did not differ between Groups 2 and 3. However, the parameters of bone resorption, such as serum tartrate resistant acid-phosphatase levels, were significantly less in Group 3 than in Group 2. These results suggest that voluntary running augments the age-dependent increase in bone mass by modulating the bone turnover when an adequate energy source is supplied under conditions of normal menstruation, and an adequate supply of energy could be necessary to enhance the age-dependent increase in bone mass.

• 財団法人 学会誌刊行センターの論文

著者

• Omi Naomi

  Department Of Exercise Nutrition Graduate School Of Comprehensive Human Sciences University Of Tsuku

• Ezawa Ikuko

  Department Of Food And Nutrition Japan Women's University

• Nakamura Toshitaka

  Department Of Neurosurgery Asahikawa Red Cross Hospital

• OMI Naomi

  Department of Food and Nutrition, School of Home Economics, Japan Women's University

• EZAWA Ikuko

  Department of Food and Nutrition, School of Home Economics, Japan Women's University

• NAKAMURA Toshitaka

  Department of Orthopedics, School of Medicine, University of Occupational and Environmental Health

• EZAWA Ikuko

  Department of Biochemistry, Faculty of Dentistry, Tokyo Medical and Dental University

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