Tantiwiboonchai Nisakorn, Kritpet Thanomwong, Yuktanandana Pongsak
Faculty of Sports Science, Chulalongkorn University, Bangkok, Thailand.
J Med Assoc Thai. 2011 Oct;94 Suppl 5:S24-30.
The purpose of the present study was to compare the effects of walking exercise with and without weighted vests on bone resorption and health-related physical fitness in the working women. Forty-eight female staff of Chulalongkorn University who were 30-60 years old voluntarily participated in the study. The subjects were randomly assigned into two groups: the experimental group performing the walking exercise wearing the weighted vests (EW, n = 24) and the control group performing the walking exercise without wearing the weighted vests (E, n = 24). The treatment was the 30-minute walking exercise on treadmill at 0% of grade, 3 times per week for 12 weeks at the intensity of 65-75% of the maximal heart rate. The first two weeks, the EW group walked without the weighted vests. Starting from the third week, the vest load was progressively increased each week with 2% of each participant's body weight until it reached 8% in the sixth week. Bone formation (PINP), bone resorption (beta-crossLaps) and health-related physical fitness were collected. The obtained data were analyzed in terms of the mean, standard deviation, paired t-test, one way analysis of covariance, one way analysis of variance with repeated measure and the multiple comparisons by using Least Significant Difference (LSD) at the 0.05 level. Prior to the experiment, the mean age and the MD of the experimental group were 41.54 +/- 8.08 yrs and -0.57 +/- 1.14, respectively. The control group has the mean age of 46.00 +/- 7.47 and BMD of -0.53 +/- 1.09. After 12 weeks of the training, there was no statistical difference in bone formation marker, bone resorption marker and health-related physical fitness between the experimental group and the control group. Moreover, the reduction of 19.143% and 21.849% of bone resorption marker in Group EW and Group E, respectively were found. Other health-related physical fitness, e.g., the muscle strength and endurance of legs and arms and the maximum oxygen uptake in both groups were significantly improved. In conclusion, the walking exercise with and without the weighted vests can reduce bone resorption and improve health-related physical fitness. This type of exercise is an alternative way to prevent bone resorption for the working women.
本研究的目的是比较有或无负重背心的步行运动对职业女性骨吸收及健康相关身体素质的影响。48名年龄在30至60岁之间的朱拉隆功大学女性职员自愿参与了该研究。受试者被随机分为两组：实验组穿着负重背心进行步行运动（EW组，n = 24），对照组不穿负重背心进行步行运动（E组，n = 24）。治疗方式为在跑步机上以0%的坡度进行30分钟步行运动，每周3次，共12周，运动强度为最大心率的65 - 75%。前两周，EW组不穿负重背心步行。从第三周开始，背心重量每周以每位参与者体重的2%逐渐增加，直至第六周达到8%。收集骨形成（PINP）、骨吸收（β-交联C端肽）及健康相关身体素质数据。所得数据采用均值、标准差、配对t检验、单因素协方差分析、重复测量的单因素方差分析以及使用最小显著差法（LSD）在0.05水平进行多重比较。实验前，实验组的平均年龄和骨密度分别为41.54±8.08岁和 - 0.57±1.14。对照组的平均年龄为46.00±7.47，骨密度为 - 0.53±1.09。经过12周训练后，实验组和对照组在骨形成标志物、骨吸收标志物及健康相关身体素质方面无统计学差异。此外，EW组和E组的骨吸收标志物分别降低了19.143%和21.849%。两组其他健康相关身体素质，如腿部和手臂的肌肉力量与耐力以及最大摄氧量均显著提高。总之，有或无负重背心的步行运动均可减少骨吸收并改善健康相关身体素质。这种运动方式是职业女性预防骨吸收的一种替代方法。
