Adequate Energy Intake Prevents Low Bone Mass Under Exercise and Low Intake of Nutrients in Young Female Rats
American Journal of Sports Science
Volume 7, Issue 3, September 2019, Pages: 127-135
Received: Aug. 14, 2019; Accepted: Sep. 9, 2019; Published: Sep. 19, 2019
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Yuki Aikawa, Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan; Department of Science of Living, Tsu City College, Tsu, Japan
Yuya Kakutani, Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan; Faculty of Health and Nutrition, Osaka Shoin Women’s University, Higashi-Osaka, Japan
Umon Agata, Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan; Department of Pharmaceutical and Medical Business Sciences, Nihon Pharmaceutical University, Ina-machi, Japan
Satoshi Hattori, Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan; Faculty of Sport Science, Waseda University, Tokorozawa, Japan
Hitomi Ogata, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Japan
Ken Kiyono, Graduate School of Engineering Science, Osaka University, Toyonaka, Japan
Ikuko Ezawa, Department of food and nutrition, Japan Women’s University, Bunkyo-ku, Japan
Naomi Omi, Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan
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We examined the effects of adequate energy intake on bone strength and bone mass under exercise and low nutrient intake using a rat model of the female athlete triad (FAT). Seven-week-old female rats were divided into four groups: sedentary and ad libitum feeding group (SED), exercise and ad libitum feeding group (EX), exercise and 30% food restriction group (EX-FR), and exercise, 30% food restriction and adequate energy intake group (EX-FR + Ene). Excise groups were performed a voluntary running. The EX-FR + Ene group was fed glucose ad-libitum to adequate energy intake. The experiment lasted for 12 weeks. The energy availability, internal organ weight, bone size, bone strength, bone mass, and calcium absorption in the EX-FR group were significantly lower than those in the EX group. There were no significant differences in these parameters except bone strength in between the EX and EX-FR + Ene groups. The breaking energy in the EX-FR + Ene group was significantly lower than those in the EX group. Our results provide evidence that adequate energy intake is important for optimal bone growth in young female athletes.
Female Athlete Triad, Food Restriction, Energy Supplementation, Bone Strength, Running Exercise
To cite this article
Yuki Aikawa, Yuya Kakutani, Umon Agata, Satoshi Hattori, Hitomi Ogata, Ken Kiyono, Ikuko Ezawa, Naomi Omi, Adequate Energy Intake Prevents Low Bone Mass Under Exercise and Low Intake of Nutrients in Young Female Rats, American Journal of Sports Science. Vol. 7, No. 3, 2019, pp. 127-135. doi: 10.11648/j.ajss.20190703.17
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