Before revision:  Methods: We conducted a prospective cohort study using data from 1670 Danish schoolchildren measured over 5.5 years  . Coupled 4-week, uncoupled 4-week, and uncoupled 5-week ACWRs were calculated using activity frequency in the past week as the acute load  and average weekly activity frequency in the past 4 or 5 weeks as the chronic load .
After revision:  Methods: We conducted a prospective cohort study using data from 1670 Danish schoolchildren measured over 5.5 years (2008 to 2014) . Coupled 4-week, uncoupled 4-week, and uncoupled 5-week ACWRs were calculated using activity frequency in the past week as the acute load and average weekly activity frequency in the past 4 or 5 weeks as the chronic load .