Davis & Gruber 2020, Injured runners do not replace lost running time

Year-long prospective cohort of 49 recreational runners wearing wrist activity monitors, published in Medicine & Science in Sports & Exercise. During weeks scored as injured (at least three planned running sessions cancelled or reduced), runners did about 14.1 fewer minutes of moderate-to-vigorous physical activity per day (95% CI −22.5 to −6.0) than in uninjured weeks, and the lost time was taken up mostly by sedentary behaviour rather than cross-training. Self-reported pain level on its own was not associated with the drop. The practical reading: injured runners tend not to substitute other activity of their own accord, so substitution has to be deliberately prescribed.