Physical activity and cardiorespiratory fitness-A ten-year follow-up.

Physical activity (PA) may influence cardiorespiratory fitness (CRF). Yet, PA takes place in different domains (i.e., sports-related physical activity [SPA], leisure time related physical activity [LTPA], and work-related physical activity [WPA]) and not all domain-specific PA may help to maintain high CRF levels throughout life. We assessed the relationship between changes in domain-specific PA and the age-related decline in CRF. We analyzed data of 353 men (median age 50 years; inter-quartile range [IQR] 40 to 60) and 335 women (median age 50 years; IQR 41 to 59) with data for domain-specific PA as well as CRF testing measured ten years apart. CRF was assessed with cardiorespiratory exercise testing. Domain-specific PA was measured using the Baecke questionnaire. During the 10-year follow-up, CRF decreased in men from 29.3 (IQR 25.0 to 34.7) mL/min/kg to 24.3 (IQR 20.8 to 27.3) mL/min/kg. In women, CRF declined from 26.0 (IQR 21.0 to 30.9) to 21.4 (IQR 18.3 to 25.6) mL/min/kg. A one point higher SPA at baseline was related to a 1.14 (95% confidence interval [CI] -1.50 to -0.53) mL/min/kg greater decrease in VO2peak . A one point greater SPA and LTPA over time was associated with a 1.68 (95% CI 1.06 to 2.29) mL/min/kg and 1.24 (95% CI 0.57 to 1.90) mL/min/kg lower decrease in VO2peak , respectively. Neither baseline values nor changes of WPA were associated with CRF. Sports and leisure time related PA may attenuate the age-related decline in CRF.