A new study of 425 Dutch recreational runners has added significant weight to the argument that sleep quality belongs alongside mileage, strength work and footwear on the list of variables runners should pay attention to if they want to stay injury free. Published in the peer-reviewed journal Applied Sciences, the paper found that participants who reported shorter sleep duration, lower sleep quality or frequent night-time disruption were almost twice as likely to have experienced a running-related injury as those with stable, good-quality sleep. For a community in which training-load monitoring still dominates the injury-prevention conversation, the finding is a pointed reminder that recovery sits on the other side of the same ledger.
The work was led by Professor Jan de Jonge, a work and sports psychologist at Eindhoven University of Technology and an Adjunct Professor at the University of South Australia. Surveying runners with an average age of 45 who had been running for an average of 12 years, the research team grouped respondents according to self-reported sleep profiles and then tracked injury histories over the preceding year. Those classed as poor sleepers were 1.78 times more likely to report an injury than the well-rested group, and had a 68 per cent likelihood of sustaining an injury over the 12-month window covered by the survey — a figure the authors describe as "clinically meaningful" rather than marginal.
The study identifies three patterns that correlated most closely with injury: difficulty falling asleep, frequent night-time waking and the simple absence of a rested feeling on waking. Runners who reported just one of those patterns had elevated risk; runners who reported more than one had risk that climbed sharply. Encouragingly, the research did not find a tight relationship between absolute sleep duration and injury, which suggests that the quality and continuity of sleep — rather than merely the total number of hours — is what the runner's repair systems are drawing on. That is a finding with practical implications for coaches who have historically fixated on seven- or eight-hour targets.
The paper lands at a moment when the injury-prevention field is interrogating its own orthodoxies. Last year an Aarhus University group argued that single-session distance spikes — rather than week-on-week mileage ratios — are the most reliable predictor of overuse injury, and warned that the Acute:Chronic Workload Ratio embedded in many commercial sports watches may mislead recreational runners. Together, the two lines of work suggest that injury risk in amateur running is mediated less by the spreadsheet training plan and more by the ragged edges of daily life: a session that runs longer than intended, or a series of nights in which a runner never quite catches up with rest.
The practical takeaway for runners, the authors argue, is to treat sleep hygiene as a trainable skill on the same footing as long runs or threshold sessions. That means consistent bedtimes, a pre-sleep wind-down that protects against late-night screen use, and a careful audit of caffeine and alcohol loading in the second half of the day — particularly in the marathon taper window, when nervous energy can compound disrupted sleep. For clinicians and physiotherapists, the study offers a free and high-impact question to add to a first consultation: not just how far the runner has been running, but how well they have been sleeping while they did it.