Is passive correction for the abducted scapula effective on spine posture during keyboard typing?
This article presents data corrected from spinal angle with and without passive correction of scapula in sixteen subjects during keyboard typing. Prolonged keyboard typing in sitting contributes to rounded shoulder posture (RSP), which involves the development of abducted scapula. The data was measured at the beginning and the end of a 30-min typing tasks in two conditions [with and without passive correction of abducted scapula (PCAS)]. Sagittal plane photography was used to measure the following postural angles at the beginning and the end of a 30-min typing task: craniocervical, neck flexion, cervicothoracic, thoracic flexion, trunk flexion, and lumbar flexion. Repeated measures analysis of variance (ANOVA) with two factors within-subjects was used to identify statistically significant differences. This paper presents data on spinal angles in 30-min computer work and effect of PCAS on spinal postures. In the results, there were statistically significant main effects for period (start vs. end) in craniocervical, neck flexion angle (p ≤ 0.001; p = 0.01) . There were no main effects for PCAS (with vs. without PCAS) in craniocervical (p = 0.61) or neck flexion angle (p = 0.19). There was no main effect for either period or PCAS with respect to lumbar flexion angle (p > 0.05) . However, significant interaction effects were observed in cervicothoracic, thoracic flexion, and trunk flexion angles. Under PCAS, we observed significantly smaller increases in thoracic flexion and trunk flexion angles over the 30-min typing task compared to the same angles measured without PCAS (p < 0.025). The cervicothoracic angle was significantly increased without PCAS compared to those with PCAS (p < 0.025).