Increased physical activity improves aerobic fitness, but not functional walking capacity, in severely obese subjects participating in a lifestyle intervention

To determine the relationship between change in physical activity level and change in directly measured maximal aerobic fitness in severely obese subjects participating in a 1-year lifestyle intervention, and to determine whether change in 6-min walk test (6 MWT) could be used as an indicator of cha...

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Bibliographic Details
Published in:Journal of rehabilitation medicine 2013-11, Vol.45 (10), p.1071-1077
Main Authors: Aadland, Eivind, Jepsen, Randi, Andersen, John Roger, Anderssen, Sigmund Alfred
Format: Article
Language:English
Subjects:
Accelerometry
Adult
Aerobic exercise
Aerobic fitness
Anthropometry
Exercise - physiology
Exercise Test
Exercise Therapy
Exercise Tolerance - physiology
Fatigue
Female
Health Promotion
Humans
Lifestyle
Male
Middle Aged
Motor Activity - physiology
Obese people
Obesity, Morbid - physiopathology
Obesity, Morbid - therapy
Physical activity
Physical Fitness - physiology
Risk Reduction Behavior
Walking - physiology
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Summary:To determine the relationship between change in physical activity level and change in directly measured maximal aerobic fitness in severely obese subjects participating in a 1-year lifestyle intervention, and to determine whether change in 6-min walk test (6 MWT) could be used as an indicator of change in aerobic fitness. Complete data on aerobic fitness (maximal oxygen consumption (VO2max) and time to exhaustion on the VO2max test), 6 MWT, and physical activity (Actigraph GT1M accelerometer) were obtained for 21 subjects (mean age 42.6 years (standard deviation (SD) 11.0 years); mean body mass index 39.6 (SD 4.5) kg/m(2)). Multiple linear regression (controlling for change in body mass index) was used to analyse the relationships for: (i) changes in physical activity vs aerobic fitness and change in 6 MWT; and (ii) changes in aerobic fitness vs 6 MWT. Change in physical activity level was related to VO2max and time to exhaustion (partial r > 0.63, p < 0.003). No significant relationships were found between changes in aerobic fitness and 6 MWT (partial r < 0.22, p > 0.351) or between changes in physical activity level and 6 MWT (partial r = 0.15, p = 0.531). Increased physical activity level over 1 year resulted in increased aerobic fitness in severely obese subjects. Although the sample size was small, these results suggest that change in 6 MWT might not be a good indicator of maximal change in aerobic fitness in this population.
ISSN:1650-1977
1651-2081
DOI:10.2340/16501977-1205