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The objective of this study was to determine if youth ice-hockey players who perform more moderate and vigorous physical activity (MVPA) during recovery take longer to achieve medical clearance to return to play (RTP).Cohort study.Sport Medicine Centre, Alberta, Canada.Thirty youth ice-hockey players [25 males, 5 females, median age 14 years (range 12–17)] presenting to a sport medicine clinic within 4 days (range 2–20 days) of sustaining a sport-related concussion diagnosed by a sport medicine physician.Participants MVPA during the first three days following their initial appointment was measured using a waist worn Actigraph accelerometer. MVPA was dichotomized into high (≥45 minutes) and low (<45 minutes) activity based on the median daily MVPA.The primary outcome was time (days) to medical clearance to RTP.All thirty participants performed at least some MVPA over the first three days, despite physician instruction to initially rest following the concussion. Players performing low levels of MVPA reached medical clearance in a median of 15 days (range: 10–30 days). Players performing high levels of MVPA reached medical clearance in a median of 19 days (range: 12–55 days). The low level MVPA group reached medical clearance significantly sooner than the high activity group (log-rank chi2=5.27, p=0.02).More time in MVPA during the first three days after initial assessment is significantly associated with greater time to medical clearance to RTP. Future research is needed to better understand the optimal amount and timing of MVPA for concussion recovery.None.