オオナル　カズヒロ   Kazuhiro Onaru   大成　和寛    所属   川崎医科大学  医学部 臨床医学　脊椎・関節整形外科学    職種   講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Differential effects of jump versus running exercise on trabecular bone architecture and strength in rats
掲載誌名	正式名：The Journal of Exercise Nutrition and Biochemistry 略　 称：J Exercise Nutrition Biochem
掲載区分	国外
巻・号・頁	24(1),pp.1-8
総ページ数	8
著者・共著者	Yong-In Ju, Hak-Jin Choi, Kazuhiro Ohnaru, Teruki Sone
発行年月	2020/02
概要	Purpose: This study compared differences in trabecular bone architecture and strength caused by jump and running exercises in rats. Methods: Ten-week-old male Wistar rats (n=45) were randomly assigned to three body weight-matched groups: a sedentary control group (CON, n=15); a treadmill running group (RUN, n=15); and a jump exercise group (JUM, n=15). Treadmill running was performed at 25 m/min without inclination, 1 h/day, 5 days/week for 8 weeks. The jump exercise protocol comprised 10 jumps/day, 5 days/week for 8 weeks, with a jump height of 40 cm. We used microcomputed tomography to assess microarchitecture, mineralization density, and fracture load as predicted by finite element analysis (FEA) at the distal femoral metaphysis. Results: Both jump and running exercises produced significantly higher trabecular bone mass, thickness, number, and fracture load compared to the sedentary control group. The jump and running exercises, however, showed different results in terms of the structural characteristics of trabecular bone. Jump exercises enhanced trabecular bone mass by thickening the trabeculae, while running exercises did so by increasing the trabecular number. FEA-estimated fracture load did not differ significantly between the exercise groups. Conclusion: This study elucidated the differential effects of jump and running exercise on trabecular bone architecture in rats. The different structural changes in the trabecular bone, however, had no significant impact on trabecular bone strength.