Advisor Information
Dr. Jenna Yentes
Location
Dr. C.C. and Mabel L. Criss Library
Presentation Type
Poster
Start Date
2-3-2018 10:45 AM
End Date
2-3-2018 12:00 PM
Abstract
Patients with chronic obstructive pulmonary disease (COPD), suffer from deficits in their functional performance besides their lung disease. In this situation, increased muscle activity is needed to provide safe walking patterns, stability while walking. This increase in muscle activity leads to increased metabolic cost, i.e., using more oxygen to complete the task. The main objective of this study is to investigate the relationship between walking stability and metabolic cost in patients with COPD in comparison with age-matched controls. Seventeen patients with COPD and 23 healthy controls walked on a treadmill at three different speeds: preferred, fast (+20% preferred) and slow (-20% preferred) speeds. Metabolic cost was calculated by subtracting metabolic rate at standing from walking metabolic rate. Stability of walking was measured by margin of stability (MOS) in anterior-posterior (AP) and medio-lateral (ML) directions. We observed that mean MOS AP had an inverse relationship with COT in both groups for all speeds indicating people with lower margins of stability (higher chance of losing balance), have higher COT while walking. However, the relationship was stronger in healthy subjects and weaker in COPD. The weaker relationship in patients with COPD, could be due to the changes in lung function and muscular system due to the disease. Patients with COPD may decrease their speed to achieve a more stable walking pattern, which costs them more to move.
Dynamic stability association with cost of transport is different in patients with COPD compared to healthy controls
Dr. C.C. and Mabel L. Criss Library
Patients with chronic obstructive pulmonary disease (COPD), suffer from deficits in their functional performance besides their lung disease. In this situation, increased muscle activity is needed to provide safe walking patterns, stability while walking. This increase in muscle activity leads to increased metabolic cost, i.e., using more oxygen to complete the task. The main objective of this study is to investigate the relationship between walking stability and metabolic cost in patients with COPD in comparison with age-matched controls. Seventeen patients with COPD and 23 healthy controls walked on a treadmill at three different speeds: preferred, fast (+20% preferred) and slow (-20% preferred) speeds. Metabolic cost was calculated by subtracting metabolic rate at standing from walking metabolic rate. Stability of walking was measured by margin of stability (MOS) in anterior-posterior (AP) and medio-lateral (ML) directions. We observed that mean MOS AP had an inverse relationship with COT in both groups for all speeds indicating people with lower margins of stability (higher chance of losing balance), have higher COT while walking. However, the relationship was stronger in healthy subjects and weaker in COPD. The weaker relationship in patients with COPD, could be due to the changes in lung function and muscular system due to the disease. Patients with COPD may decrease their speed to achieve a more stable walking pattern, which costs them more to move.