Nakazono E, Miyazaki H, Abe S, Imai K, Masuda T, Iwamoto M, Moriguchi R, Ueno H, Ono M, Yazumi K, Moriyama K, Nakano S, Tsuda H
Graduate School of Health and Nutrition Sciences, Nakamura Gakuen University, 5-7-1, Befu, Jounan-ku, Fukuoka, 814-0198, Japan.
Osteoporos Int. 2014 Feb;25(2):485-95. doi: 10.1007/s00198-013-2416-4. Epub 2013 Jun 21.
A 3-year follow-up study on 334 young Japanese females enrolled in a university at the age of 18 years revealed that discontinuation of leisure time impact-loading exercises performed in junior high and/or high school was associated with increased risk of reduction in calcaneus osteo-sono assessment index (OSI).
Bone strength rapidly increases during puberty and reaches its peak by the end of adolescence. The aim of this study was to determine the lifestyle factors that influence the maintenance of calcaneus OSI in young adult females around the time when peak bone mass is attained.
Annual health checkups including OSI measurements, anthropometrics, lifestyle analysis, and blood examination were performed 4 times on 334 Japanese females enrolled in a university at the age of 18 years. According to the slope of OSI change during the 3-year follow-up, the subjects were grouped into two categories: OSI loss (the lowest tertile) and OSI gain/stable (the second and third tertiles).
At the baseline assessment, the OSI loss group had higher OSI and height and an earlier menarche age than the OSI gain/stable group. Performing leisure time impact-loading exercise in junior high and/or high school but discontinuing it at university was associated with increased risk of OSI loss, independent of OSI, height and weight at the age of 18 years, weight change during follow-up, age of menarche, energy-adjusted nutrient intake, and alcohol drinking; the odds ratios were 4.1-4.9 compared with those performing impact-loading exercise at university. In particular, duration, frequency, and subjective intensity of impact-loading exercise during high school were positively associated with OSI loss.
Discontinuation of leisure time impact-loading exercises performed during late adolescence is associated with an increased risk of OSI loss in young adult females during the 3-year follow-up period.
一项针对334名18岁进入大学的日本年轻女性的3年随访研究表明，初中和/或高中时停止进行休闲时间的冲击负荷运动与跟骨骨声评估指数（OSI）降低风险增加有关。
青春期骨强度迅速增加，并在青春期结束时达到峰值。本研究的目的是确定在达到峰值骨量时影响年轻成年女性跟骨OSI维持的生活方式因素。
对334名18岁进入大学的日本女性进行了4次年度健康检查，包括OSI测量、人体测量、生活方式分析和血液检查。根据3年随访期间OSI变化的斜率，将受试者分为两类：OSI下降（最低三分位数）和OSI增加/稳定（第二和第三三分位数）。
在基线评估时，OSI下降组的OSI、身高较高，月经初潮年龄比OSI增加/稳定组早。初中和/或高中时进行休闲时间的冲击负荷运动但在大学时停止，与OSI下降风险增加有关，独立于18岁时的OSI、身高和体重、随访期间的体重变化、月经初潮年龄、能量调整后的营养摄入和饮酒情况；与在大学进行冲击负荷运动的人相比，优势比为4.1-4.9。特别是，高中时冲击负荷运动的持续时间、频率和主观强度与OSI下降呈正相关。
青春期后期停止进行休闲时间的冲击负荷运动与年轻成年女性在3年随访期间OSI下降风险增加有关。
