흡기동작 시 가슴우리 확장과 목 주변 근육활성도에 관한 연구 : 편평등증후군의 특징 연구 = A Study on Chest Expansion and Neck, Shoulder Muscle Activation during Inhalation: Investigating Characteristics of Flat Back Syndrome

다국어 초록 (Multilingual Abstract)

Background: This study was to investigate effects of flat-back posture during inhalation compared to normal posture, focusing on the expansion of the chest and the activation of neck muscles.
Design: Case-control study.
Methods: Thirty subjects participated in this study. Plumb line distances and Sagittal index were measured using a ruler and a laser level in the standing position to evaluate and classify thoracic kyphosis of the subjects. Chest expansion was measured using a ruler, and surface electromyography was used to measure muscle activity around the neck and shoulders during inhalation. Correlation analysis and independent t-tests were conducted to compare chest expansion and muscle activity around the neck between subjects with flat-back posture and those with normal posture during inhalation.
Results: The correlation analysis showed a statistically significant positive correlation between Sagittal index and chest expansion at the level of the xiphoid process (r=.558, p<.05), and a statistically significant negative correlation between Sagittal index and activity of the upper trapezius at the onset of inhalation (r=-.368, p<.05). Independent t-test results indicated significant differences between the flat-back posture group and the normal posture group in the circumference of the xiphoid process at rest (p<.05) and in the activity of the upper trapezius at the onset of inhalation (p<.05).
Conclusion: Flat-back posture influences a decrease in chest expansion and at the same time increases the muscle activity of the upper trapezius muscle at the beginning of inspiration.