[[alternative]]The effects of inspiratory muscle training on pulmonary function, 6-min walking capacity and body composition in obese adult

[[abstract]]肥胖在肺部問題上降低胸部順應性及呼吸肌耐力並且增加呼吸功和呼吸道阻力進而造成肥胖者運動耐受性不足、運動性呼吸困難或疲勞，和日常生活活動障礙等。本研究目的是探討吸氣肌訓練介入對肥胖者肺功能、身體組成、血脂肪及身體活動的影響。以北部某區域醫院之工作人員BMI大於27%之患者28人為受試對象，立意取樣分為實驗組與安慰劑組行實驗，兩組皆接受前後兩次肺功能、吸氣肌壓力檢測、血脂肪檢驗、體脂肪測量及身體活動等測驗。阻力強度設定為實驗組55%PImax，安慰劑組10%PImax，每次30口氣，一次2回，每週3天共訓練6週。實驗結果以二因子變異數(Two-way analysis of variance, ANOVA)進行分析。結果：經6週的訓練介入後，兩組在肺功能檢測皆無顯著差異，而在吸氣肌壓力(PImax)實驗組顯著高於控制組(138.8±15.2 vs 100.8±15.2 cmH2O, p < .05）；在身體組成方面，兩組體脂肪及BMI則無差異；另外在身體活動方面，實驗組在6分鐘步行距離和漸速性折返走級數(6MWD，688.3±65.3 vs 636.3±37.8 公尺；MISWT，12.2±0.91 vs 0.3±0.5級數, p < .05)均高於控制組。結論：本研究結果顯示，6週吸氣肌運動訓練，對於肥胖者的吸氣肌壓力、6分鐘步行及漸速性折返走均有可改善效果，然而，對肺功能和體脂肪則無幫助。[[abstract]]Obesity can cause lung problems in the work of breathing and increase airway resistance. All these problems affect insufficient exercise tolerance, exertional dyspnea or fatigue, and obese people often meet obstacles in daily activities. The present study is to investigate the involvement of inspiratory muscle training on lung function in obese people, body composition, lipid and physical activity. In the northern part of Taiwan, the staff of a regional hospital, 28 subjects with BMI higher than 27%, using purposive sampling, are divided into experimental group(EXP) and the placebo group (PLA). Two groups are accepted twice before and after pulmonary function, inspiratory muscle pressure testing, lipid and physical activity testing(6-minute walk test, 6MWT; modified incremental shuttle walking test, MISWT). The EXP and PLA by performing two sets of 30 breaths at 55% and 10% maximum inspiratory mouth pressure (PImax), for three days a week for six weeks of training. The data were obtained and analyzed with the variation of two-factor(Two-way analysis of variance, ANOVA). The results: After six weeks of training intervention, the two groups are no significant differences in pulmonary function testing, but in EXP PImax more than PLA (138.8± 15.2 vs 100.8±15.2 cmH2O, p < .05). In the body composition, lipid and BMI are no significant differences. On the other hand, in the part of physical activity, the EXP in 6MWT and MISWT are higher than PLA (6MWD，688.3±65.3 vs 636.3±37.8 m；MISWT，12.2±0.91 vs 0.3±0.5 level, p < .05). Conclusion: These results indicate that the inspiratory muscle training can improve the PImax, 6MWT and MISWT, however, might not improve pulmonary function and body fat