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Lung India Official publication of Indian Chest Society  
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Year : 2019  |  Volume : 36  |  Issue : 5  |  Page : 417-421

Quadriceps strength in patients with chronic obstructive pulmonary disease

1 Department of Physiology, B.J. Government Medical College; Department of Health and Biomedical Sciences, Symbiosis International (Deemed) University, Pune, Maharashtra, India
2 Student of MTech Mechatronics, College of Engineering Pune, Pune, Maharashtra, India
3 Department of Health and Biomedical Sciences, Symbiosis International (Deemed) University, Pune, Maharashtra, India
4 Department of Physiology, B.J. Government Medical College, Pune, Maharashtra, India

Correspondence Address:
Dr. Swati Shah
B.J. Government Medical College, Pune, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/lungindia.lungindia_27_19

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Background: Skeletal muscle dysfunction is well known in chronic obstructive pulmonary disease (COPD). The muscle strength is altered in various muscles variedly. Lower-limb muscle strength is very important for walking distance. Reduced lower-limb strength can affect the physical quality of life. Objectives: The aim of the study was to assess and compare the quadriceps strength in COPD patients and age-matched healthy controls and to study the correlation between lung function parameters and the quadriceps strength in patients with COPD. Methodology: Thirty nonsmoker male patients; thirty nonsmoker female patients with COPD; and sixty age-, BMI-, and gender-matched healthy controls were studied. Quadriceps muscle strength was measured using a quadriceps dynamometer. Forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), FEF 25–75, and peak expiratory flow rate were measured using Helios 702 Spirometer. The quadriceps muscle strength between the two groups was compared using the unpaired Student's t-test. Correlations between FVC and FEV1with muscle strength were analyzed using the Pearson's coefficient. Results: The mean unilateral and bilateral quadriceps strength in both male and female COPD patients was significantly lesser than the healthy controls (P < 0.05). There was a significant positive correlation between muscle strength and FVC and muscle strength and FEV1in patients with COPD. Conclusion: The study shows that there is quadriceps weakness in COPD patients, and pulmonary functions have a direct impact on skeletal muscle strength. Identifying those patients who have reduced strength will allow early interventions targeted at improving the quality of life of the patient.

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