Effects of voluntary exercise on physical fitness and lifestyle activity

本研究的目的是调查自愿运动（步行）对身体健康和生活方式活动的影响。研究对象是从大学周围的社区招募的，他们自愿接受为期八周的干预。干预组分为课堂步行组（A: n=32）、自愿步行组（B: n=34）、血压监测组（C: n=22）、活动监测组（D: n=48）。虽然干预前各组间日常活动量无显著差异，但干预期间除C、D组外其余各组间均有显著差异。A组因集体步行而产生的预期步数（9025±584步）较除班级步行日（11719±3454步）外的班级步行日（16191±3988步）增加，但班级步行日自愿步数（7166±3892步）显著减少，与日常活动基准线差异不显著。干预后4个月，A组（11487±4057）和B组（9564±2545）的日常活动量与基线相比有显著增强，但C组（9070±3485）无显著增强。一年的随访数据也显示了类似的结果。这些数据表明，指导和包括课堂行走在内的预期步骤增强了日常活动，并且自愿步骤对干预后维持生活方式活动的作用更大。

The purpose of this study was to investigate the effects of voluntary exercise (walking) on physical fitness and lifestyle activity. The subjects were recruited from the community around the university, and volunteered to eight weeks intervention. The intervention groups were class-walking group (A : n=32) , voluntary walking group (B : n=34) , blood-pressure monitor group (C : n=22) , and activity monitor group (D : n=48) . Although there was no significant difference among groups in the daily activity before the intervention, there were significant difference between any groups except C and D during intervention. As for A group, the intended steps due to group walking (9025±584 steps) enhanced the daily activity in the class-walking day (16191±3988 steps) comparig with that except in the class-walking day (11719±3454 steps) , but also signigicantly attenuated the voluntary steps in the class-walking day (7166±3892 steps) , which was not significantly different from base line of the daily activity. There were significant enhancement of daily activity at 4 months after the intervention for A (11487±4057) and B (9564±2545) , but not for C (9070±3485) comparing with base-line daily activity. One year follow-up data also showed similar results. These data suggests that the instruction and the intended steps including the class-walking enhance the daily activity, and that the voluntary steps would play more important role for maintaining the lifestyle activity after the intervention.