Asahi University, Department of Health Science and Sports Sciences, School of Health Sciences, Mizuho, Gifu, Japan.
Suzuka University of Medical Science, Faculty of Health Sciences, Department of Clinical Nutrition, Suzuka, Mie, Japan.
J Sports Sci Med. 2020 May 1;19(2):237-244. eCollection 2020 Jun.
Unlike the lumbar spine and femur, the radius does not bear a gravitational mechanical compression load during daily activities. The distal radius is a common fracture site, but few studies have addressed the effects of exercise on fracture risk. The aim of this study was to determine the effects of the pole push-off movement of Nordic walking (NW) on the bone mineral content (BMC) and areal bone mineral density (aBMD) of the distal radius and the muscle cross-sectional area (CSA) at the mid-humeral and mid-femoral levels. The participants were allocated to two groups: an NW group and a control group. The NW group walked at least 30 min with NW poles three times a week for six months. There were no significant changes in muscle CSA at the mid-humeral or mid-femoral levels between or within groups. There were also no significant changes in BMC or aBMD at 1/3 and 1/6 of the distance from the distal end of the radius in either group. However, the BMC and aBMD at 1/10 of the distance from the distal end of the radius were significantly increased by NW. The NW pole push-off movement provided effective loading to increase the osteogenic response in the ultra-distal radius. The ground reaction forces transmitted through the poles to the radius stimulated bone formation, particularly in the ultra-distal radius.
与腰椎和股骨不同，桡骨在日常活动中不承受重力机械压缩载荷。桡骨远端是常见的骨折部位，但很少有研究探讨运动对骨折风险的影响。本研究旨在确定北欧式行走（NW）的撑杆离地动作对桡骨远端骨矿物质含量（BMC）和面积骨密度（aBMD）以及肱中和股骨中段肌肉横截面积（CSA）的影响。参与者被分配到两个组：NW 组和对照组。NW 组每周至少用 NW 撑杆行走三次，每次至少 30 分钟，持续六个月。肱中和股骨中段的肌肉 CSA 在组间或组内均无显著变化。桡骨远端 1/3 和 1/6 处的 BMC 和 aBMD 也没有显著变化。然而，NW 使桡骨远端 1/10 处的 BMC 和 aBMD 显著增加。NW 撑杆离地动作提供了有效的负荷，增加了超远端桡骨的成骨反应。通过撑杆传递到桡骨的地面反作用力刺激了骨形成，特别是在超远端桡骨。
