Many running-related injuries that look like overuse on the surface have a more sudden onset than the gradual-accumulation model suggests, often triggered by an identifiable training error in the prior week.

In plain English

Many running injuries do not creep up slowly. A lot of them start in a single run or a single week, often right after a sudden jump in distance or speed.

Why it works

Tissue tolerance has thresholds; a single session that exceeds tissue capacity can cause acute injury that the runner perceives as 'overuse' because the activity is repetitive.

What it means in practice

When a runner reports new pain, ask about the prior 1-2 weeks of training: was there a long run that was too long, a hill workout, a faster session, a return after a rest week? Treat sudden volume/intensity changes as the prime suspect, not just chronic overuse.

The evidence

• Abrahamson, J., Jacobsen, P.A., Nielsen, R.O. et al. (2024). Using Self-Reported Training Characteristics to Better Understand Who Is More Likely to Sustain Running-Related Injuries Than Others: The Garmin-RUNSAFE Running Health Study. Scandinavian Journal of Medicine & Science in Sports.

  Runners not following a structured running program sustained more RRIs (61%) than runners who did (57%, p=0.023) — a small but statistically significant difference. Two specific risk pathways are emphasized: (1) Insufficient recovery between sessions (more weekly running sessions, higher running frequency, longer maximum runs each compress recovery time, increasing RRI risk). (2) Excessively steep or rapid increases in workload — large weekly changes in workload (intensity, frequency, and duration) significantly increase RRI risk. The authors argue that following a structured program enables better workload monitoring, fatigue recognition, and recovery assessment, and is therefore associated with lower injury risk.

• Fokkema, T., de Vos, R.-J., van Ochten, J.M. et al. (2020). Enhanced injury prevention programme for recreational runners (the SPRINT study): design of a randomised controlled trial. BMJ Open Sport & Exercise Medicine.

  Establishes the ACWR>1.5 threshold as the operational cutoff for 'too much, too fast' training increases in the SPRINT trial design, drawing on Hulin and Gabbett's team-sport literature and Johnston 2019's endurance-athlete validation. Cites the supporting evidence: weekly running distance >30 km associated with increased injury risk; weekly increase in distance >30% associated with increased injury risk; large sudden changes in training load increase injury risk in team sports. Strength training has a positive effect on running performance (energy cost, running economy) and decreases the risk of both acute and overuse sport injuries.

Why we call confidence medium

Garmin RUNSAFE (Abrahamson 2024) and the JOSPT 2023 paper on the same dataset are reframing the gradual-onset assumption with prospective data showing sudden symptom onset is common. This is an emerging view; older literature emphasizes gradual accumulation.

Where it applies

Adult recreational runners using wearables to track training.

Does not apply to: clearly-progressive overuse cases like classic stress reactions evolving over months.

Related claims

• Rapid volume jumps raise injury risk
• Higher chronic load is protective