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[Purpose] This study investigated upper-extremity muscle activities in natural, ideal,
and corrected head positions. [Subjects and Methods] Forty subjects with a forward head
posture and rounded shoulder were recruited and randomly assigned to the natural head
position group (n = 13), ideal head position group (n =
14), or corrected head position group (n = 13). Muscle activities were
measured using a four-channel surface electromyography system at the
sternocleidomastoideus, upper and lower trapezius, and serratus anterior muscles on the
right side during an overhead reaching task. [Results] The muscle activities of the upper
trapezius and serratus anterior differed significantly among head positions. Post hoc
tests revealed significant differences between natural and ideal head positions, and
natural and ideal head positions for both the upper trapezius and serratus anterior.
[Conclusion] Recovery of normal upper trapezius and serratus anterior muscle functions
plays an important role in correcting forward head posture and rounded shoulders.Key words: Forward head posture, Muscle activity, Round shoulder 相似文献