Abstract：
Extensive cross-sectional research reports that body fat and muscularity dissatisfaction contribute to negative psychological outcomes among sexual minority men; however, longitudinal models are necessary for accurately quantifying the strength and direction of these relationships. We investigated the bidirectional longitudinal relationships of body fat and muscularity dissatisfaction with psychological quality of life among 2953 sexual minority men using random intercept cross-lagged panel models. Consistent with existing literature, we found that higher average muscularity and body fat dissatisfaction were associated with higher average psychological quality of life impairment between-persons. Unexpectedly, these constructs were not significantly associated within-persons/longitudinally. These findings conflict existing literature\'s conclusions that muscularity and body fat dissatisfaction consistently contribute to poorer psychological wellbeing in this population. A significant between-person relationship in the absence of within-person relationships suggests that intermediary constructs (e.g., body ideal internalization) may account for the between-person effects of muscularity and body fat dissatisfaction on psychological wellbeing. Future research can accurately estimate these effects and identify reliable intervention targets by ensuring that within- and between-person relationships are examined separately, rather than being conflated.
摘要：
广泛的横断面研究报告说，身体脂肪和肌肉的不满有助于性少数男性的负面心理结果;然而，纵向模型对于准确量化这些关系的强度和方向是必要的。我们使用随机截距交叉滞后面板模型调查了2953名性少数族裔男性的身体脂肪和肌肉不满意与心理生活质量的双向纵向关系。与现有文献一致，我们发现,较高的平均肌力和体脂肪不满意与较高的人之间的平均心理生活质量障碍相关.出乎意料的是,这些结构在人内/纵向没有显著相关.这些发现与现有文献的结论相冲突，即肌肉和身体脂肪的不满始终导致该人群的心理健康较差。在没有人内关系的情况下，重要的人与人之间的关系表明，中介结构(例如，身体理想的内化）可以解释肌肉和身体脂肪不满对心理健康的人与人之间的影响。未来的研究可以准确地估计这些影响，并通过确保单独检查人与人之间的关系来确定可靠的干预目标，而不是混为一谈。
