SESSION TYPE: Physiology/PFTs/ Rehabilitation Posters
PRESENTED ON: Wednesday, October 24, 2012 at 01:30 PM - 02:30 PM
PURPOSE: This study was performed to compare vital sign responses in individuals with chronic lung disease when using continuous and pulsed oxygen during a six minute walk test (6MWT) and stair climb test (SCT).
METHODS: 17 patients with chronic lung disease (convenience sample) performed a 6MWT and SCT on two different days using continuous oxygen on one day and pulsed oxygen on another. 6MWD, SCT time, HR, SpO2, reported dyspnea and recovery time were measured for all four conditions. Both oxygen delivery and type of test (SCT or 6MWT) were randomly assigned to each patient. Multivariate repeated measures analysis of variance statistics were used to analyze the data.
RESULTS: Nine males and eight females with a mean age of 71+/- 10.8 years and mean FEV1.0 of 48.6 % completed the study. Although the multivariate repeated measures was not significant (p=0.18) which is explained by a lack of power( power =0.45), there was an overall large effect size (eta square = 0.62) of oxygen delivery type on performance during the 6MWT and SCT. Specifically the effect impacted recovery time after the 6MWT (eta square = 0.32). The influence on 6MWT recovery time was supported by a significant non parametric Friedman test χ2 =4.571, p = 0.03 with the Kendall coefficient of concordance = 0.27. Recovery time was longer when the subjects used the pulsed oxygen delivery (178.06 +/- 79.5 seconds) versus continuous oxygen delivery (128.9 +/- 42.6 seconds).
CONCLUSIONS: The results of this study were inconclusive due to a small sample size. However, the trend (supported by a large effect size) demonstrated that although actual performance (6MW distance and stair climb time) on the activities was not affected by the type of oxygen delivery, individuals utilizing pulsed oxygen delivery took longer to return to baseline values as compared to continuous oxygen.
CLINICAL IMPLICATIONS: The type of oxygen delivery may not affect the actual performance of an activity for individuals with chronic lung disease. However, the recovery time after an activity, whether anaerobic or aerobic may differ depending on oxygen delivery. With longer recovery times, individuals may experience more fatigue throughout the day and may decrease their activity level due to lengthy recovery times. Therefore, continuous oxygen delivery may be a better choice to use with activity to decrease exercise fatigue and recovery. Future studies with an increased sample size are warranted.
DISCLOSURE: The following authors have nothing to disclose: Ellen Hillegass, Dawn Hayes, Dana Sanders, Todd Owens, Casey Langbehn, Michael Johnson, Adam Tahlor
No Product/Research Disclosure InformationNorth Georgia College and State University, Dahlonega, GA