Padkao Tadsawiya, Boonla Orachorn
Faculty of Allied Health Sciences, Burapha University, Chonburi, Thailand.
Exercise and Nutrition Sciences and Innovation Research Unit, Burapha University, Chonburi, Thailand.
J Exerc Rehabil. 2020 Apr 28;16(2):189-196. doi: 10.12965/jer.2040080.040. eCollection 2020 Apr.
Chest wall expansion determines lung volume and functional capacity. Factors determining chest wall expansion include respiratory muscle strength. Accordingly, there may be association among respiratory muscle strength, chest wall expansion, and functional capacity. Thusly, this cross-sectional study identified the relationship between respirato-ry muscle strength, chest wall expansion, and functional capacity. Seventy-six healthy male and female participants aged between 20 to 59 years exhibiting a body mass index of 18.5 to 22.9 kg/m were enrolled. Inspiratory and expiratory muscle strength were evaluated via maximum inspiratory pressure (MIP) and maximum expiratory pressure (MEP), respectively. Chest wall expansion was measured through thoracic circumferences at three different levels; upper, middle, and lower levels with diaphragmatic movement also measured utilizing the circumference of the lower edge of the 10th rib. Functional capacity was evaluated through distance obtained from a 6-min walk test. Results showed that both MIP and MEP were significantly correlated with chest wall expansion at the middle (=0.005 and =0.006) and lower (=0.012 and =0.020) thoracic levels as well as diaphragmatic movement (both <0.001). Moreover, both MIP and MEP were significantly related amid the 6-min walk distance (=0.025 and <0.001). In conclusion, respiratory muscle strength is positively associated with chest wall expansion, diaphragmatic movement, and functional capacity in healthy participants.
胸壁扩张决定肺容量和功能能力。决定胸壁扩张的因素包括呼吸肌力量。因此，呼吸肌力量、胸壁扩张和功能能力之间可能存在关联。因此，这项横断面研究确定了呼吸肌力量、胸壁扩张和功能能力之间的关系。招募了76名年龄在20至59岁之间、体重指数为18.5至22.9 kg/m的健康男性和女性参与者。分别通过最大吸气压力（MIP）和最大呼气压力（MEP）评估吸气和呼气肌力量。通过三个不同水平的胸围测量胸壁扩张；上、中、下水平，同时利用第10肋下缘的周长测量膈肌运动。通过6分钟步行试验获得的距离评估功能能力。结果表明，MIP和MEP与胸壁中部（=0.005和=0.006）和下部（=0.012和=0.020）水平的扩张以及膈肌运动（均<0.001）均显著相关。此外，MIP和MEP与6分钟步行距离均显著相关（=0.025和<0.001）。总之，在健康参与者中，呼吸肌力量与胸壁扩张、膈肌运动和功能能力呈正相关。
