Effects of Tower Climbing Exercise on Bone Mass, Strength, and Turnover in Growing Rats
作者:Takuya Notomi、Nobukazu Okimoto、Yuichi Okazaki、Yuri Tanaka、Toshitaka Nakamura、Masashige Suzuki
DOI:10.1359/jbmr.2001.16.1.166
日期:——
To determine the effects of tower climbing exercise on mass, strength, and local turnover of bone, 50 Sprague‐Dawley rats, 10 weeks of age, were assigned to five groups: a baseline control and two groups of sedentary and exercise rats. Rats voluntarily climbed the 200‐cm tower to drink water from the bottle set at the top of it. In 4 weeks, the trabecular bone formation rate (BFR/bone surface [BS]), bone volume (BV/TV), and trabecular thickness (Tb.Th) of both the lumbar vertebra and tibia and the bone mineral density (BMD) of the tibia increased, while the osteoclast surface (Oc.S) decreased. The parameter values in the midfemur, such as the total cross‐sectional area, the moment of inertia, the periosteal mineralizing surface (MS/BS), mineral apposition rate (MAR), BFR/BS, and bending load increased, while the endosteal MAR decreased. In 8 weeks, the increases in the bone mineral content (BMC), BMD of the femur and tibia, and the bending load values of the femur were significant, but the climbing exercise did not increase BMC, BMD, or the compression load of the lumbar vertebra. Although the periosteal MS/BS, MAR, and BFR/BS increased, the endosteal MS/BS, MAR, and BFR/BS decreased. These results show that climbing exercise has a beneficial effect on the femoral cortex and tibia trabecular, rather than the vertebral trabecular. In the midfemur, effects on bone formation are site specific, supporting accelerated cortical drift by mechanical stimulation.
为了确定爬塔运动对骨骼质量、强度和局部周转的影响,我们将 50 只 10 周大的 Sprague-Dawley 大鼠分为五组:一组为基线对照组,两组分别为静坐组和运动组。大鼠自愿爬上 200 厘米高的塔,从塔顶的瓶子里喝
水。4周后,腰椎和胫骨的骨小梁形成率(BFR/骨表面[BS])、骨量(BV/TV)和骨小梁厚度(Tb.Th)以及胫骨的骨矿物质密度(BMD)均有所增加,而破骨细胞表面(Oc.S)则有所减少。中腓骨的参数值,如总横截面积、惯性矩、骨膜矿化面(MS/BS)、矿物质附着率(MAR)、BFR/BS 和弯曲负荷都有所增加,而骨膜矿化面(MAR)则有所减少。8 周后,股骨和胫骨的骨矿物质含量(
BMC)、BMD 以及股骨的弯曲负荷值均显著增加,但攀爬运动并未增加腰椎的骨矿物质含量、BMD 或压缩负荷。虽然骨膜MS/BS、MAR和BFR/BS有所增加,但骨膜内MS/BS、MAR和BFR/BS却有所减少。这些结果表明,爬山运动对股骨皮质和胫骨小梁而非椎骨小梁有益处。在股骨中段,对骨形成的影响具有部位特异性,支持机械刺激加速皮质漂移。