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Estimate the shape and number of cardiorespiratory fitness (CRF) trajectories from childhood to adolescence; and verify whether CRF trajectory membership can be predicted by sex, biological maturation, body weight, body composition and physical activity (PA) in childhood. Data from QUALITY were used. Participants attended baseline (8–10 y old,  n  = 630) and follow-ups 2 years ( n  = 564) and 7 years ( n  = 359) after baseline. Group-based trajectory analysis for relative peak oxygen consumption (VO 2peak , ml·kg −1 ·min −1 ) was performed. A multinomial logistic regression model was used to estimate the associations between baseline predictors and trajectory membership. Mean age of the 454 participants was 9.7 ± 0.9 years at baseline. Three distinct VO 2peak  trajectories were identified and all tended to decrease. They were labelled according to the starting point and slope. High-Decreasers were mostly boys, had lower body weight and fat-free mass index and higher PA levels at baseline ( p  &lt; 0.05). Female sex and higher weight were associated with higher odds of being classified in the Low-Decreaser trajectory (OR = 74.03, 95%CI = 27.06–202.54; OR = 1.48, 95%CI = 1.36–1.60). Those with higher PA were less likely to be Low-Decreasers (OR = 0.96, 95%CI = 0.94–0.97). Sex, body weight and PA in childhood are important influencing factors of VO 2peak  (ml·kg −1 ·min −1 ) trajectories across adolescence.

Trajectories of cardiorespiratory fitness from childhood to adolescence: Findings from the QUALITY cohort