The effect on cardiorespiratory fitness after an 8-week period of commuter cycling - A randomized controlled study in adults

Objective. This study investigated the effect of commuter cycling on cardiorespiratory fitness in men and women. Secondary outcomes included body fat and blood pressure measurements. Methods. In February 2009, 48 volunteers from the Island of Funen, Denmark were randomly assigned to either no change in lifestyle or to minimum 20 minutes of daily commuter cycling during 8 weeks. Maximal oxygen uptake was assessed directly during a progressive cycle-ergometer-test, sum of skinfolds was used as an estimate of body fat, and blood pressure was measured using a Dinamap monitor. Measurements were obtained at baseline and at the conclusion of the 8-week intervention program. Results. Six cyclists dropped out. After 8 weeks (V) over dotO(2)max (mL O-2 min(-1)) and cardiorespiratory fitness (mL O-2 kg(-1) min(-1)) were significantly improved in the cycling group when compared to the control group. Delta change in (V) over dotO(2)max between groups equaled 206 mL O-2 min(-1) (p = 0.005) and delta change in cardiorespiratory fitness equaled 2.6 mL O-2 kg(-1) min(-1) (p=0.003). Body fatness changed more noticeable (p=0.026) in the cyclists (-12.3 +/- 7.3 mm) than in the controls (0.2 +/- 7.1 mm). Conclusions. VO(2)max and cardiorespiratory fitness were significantly improved and body fat reduced as a result of people engaging in 8 weeks of commuter cycling. (C) 2011 Elsevier Inc. All rights reserved.