Women perform less physical activity (PA) than men, and this gap widens during college. This study examined college women’s daily PA intentions and behavior, and whether social support or social comparison orientation (SCO) moderated the PA intention-behavior relation. College women (N = 80) completed measures of social support and SCO at baseline. For seven consecutive days, participants completed an electronic survey to assess PA intentions and wore an activity monitor to assess minutes of moderate-to-vigorous intensity physical activity (MVPA). Results indicated that intended and performed MVPA minutes were weakly related (p = 0.17, sr = 0.16). Social support did not moderate the intention-behavior relation, but SCO did (p = 0.04, sr = 0.21). Participants with stronger (vs. weaker) SCO, particularly a tendency to compare downward (i.e., to worse-off others), showed smaller discrepancies between intended and completed MVPA. College women frequently fail to achieve PA goals, but stronger tendencies to make (downward) social comparisons may minimize this gap and be a target for intervention.

与男性相比，女性的体力活动 (PA) 更少，而且这种差距在大学期间扩大了。本研究考察了大学女性的日常 PA 意向和行为，以及社会支持或社会比较取向 (SCO) 是否调节了 PA 意向-行为关系。大学女性 ( N  = 80) 在基线时完成了社会支持和 SCO 的测量。连续 7 天，参与者完成了一项电子调查以评估 PA 意图，并佩戴活动监视器来评估中高强度身体活动 (MVPA) 的分钟数。结果表明，预期和执行的 MVPA 分钟相关性较弱（p  = 0.17，sr  = 0.16）。社会支持没有调节意图-行为关系，但 SCO 有（p = 0.04，sr  = 0.21）。具有较强（与较弱）SCO 的参与者，特别是倾向于向下比较（即，与其他人相比更差）的参与者，在预期和完成的 MVPA 之间表现出较小的差异。大学女性经常无法实现 PA 目标，但进行（向下）社会比较的更强倾向可能会最大限度地减少这种差距并成为干预的目标。