单手与双手使用智能手机后大学生肩峰距离、肺功能和周围微血管灌注的急性变化：一项随机平行组试验的二次分析

Background and Objectives: The acute effects of one-handed versus two-handed smartphone use on shoulder position, pulmonary function, and local cutaneous microvascular perfusion remain unclear. This secondary analysis of a randomized parallel-group trial aimed to explore differences in forced vital capacity (FVC), other pulmonary function parameters, bilateral supine acromial distance, and local cutaneous microvascular perfusion between the two smartphone-handling conditions. Methods: In this randomized parallel-group pretest–posttest trial, 63 university students were allocated to either one-