Abstract
Objectives
Firstly, to investigate the longitudinal associations between accelerometer-derived
physical activity (PA) intensities and physical fitness (PF) at 24-month follow-up
in adolescents. Secondly, to examine how substituting time spent in low or moderate
PA intensities with vigorous PA at baseline was related to PF at 24-month follow-up.
Design
Longitudinal observational study
Method
The DADOS (Deporte, ADOlescencia y Salud) study is a 3-year longitudinal research
project carried out between years 2015–2017. The analyses included 189 adolescents
(91 girls) aged 13.9 ± 0.3 years at baseline. PA was assessed by a wrist-worn GENEActiv triaxial accelerometer
and expressed as minutes/day of light, moderate and vigorous PA. Cardiorespiratory,
musculoskeletal and motor fitness were assessed by field tests and a global fitness
z-score was calculated as the mean of the z-scores values of each fitness test. Association
between PA intensities and PF were determined using linear regression. Isotemporal
analyses estimating the association of reallocating PA intensities with PF were performed.
Results
Baseline vigorous PA was positively associated with cardiorespiratory fitness and
global fitness score at follow-up in boys (β = 0.234;p = 0.002, β = 0.340;p < 0.001) and girls (β = 0.184;p = 0.043, β = 0.213;p = 0.004). In boys, baseline vigorous PA was also positively associated with musculoskeletal
and motor fitness (β = 0.139;p = 0.035, β = 0.195;p = 0.021). The substitution of 10 min/day of light PA or moderate PA with 10 min/day of vigorous PA at baseline was positively associated with all PF components
and global fitness score in boys (p < 0.001), and with global fitness score girls (p < 0.05).
Conclusion
These findings highlight the need of promoting vigorous PA due to its specific influence
on adolescent's PF.
Keywords
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Article Info
Publication History
Published online: April 17, 2020
Accepted:
April 8,
2020
Received in revised form:
March 11,
2020
Received:
September 29,
2019
Identification
Copyright
© 2020 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
