How is the acute:chronic workload ratio used to monitor injury risk in athletes?

• A. Compare chronic to acute; spikes reduce risk
• B. Compare recent acute to longer-term chronic; spikes indicate higher injury risk
• C. Ignore workload
• D. Only consider rest days

Answer: (B)

The key idea is that injury risk is best understood by how current short-term demand compares to what the body has already adapted to over a longer period. Acute workload captures the recent stress, while chronic workload reflects the longer-term training history. When recent work suddenly increases relative to that longer-term baseline, the ratio climbs, signaling a spike in load that the athlete’s tissues may not be prepared for yet. This mismatch—high acute relative to chronic—has consistently been linked to a higher risk of injury because fatigue and micro-damage accumulate faster than the body can adapt. So, monitoring the ratio helps teams adjust training to keep spikes in check and maintain safer loading. The other ideas ignore this mechanism or misstate the direction of risk: workload shouldn’t be ignored, rest days alone don’t address the relative change in load, and reversing the comparison (chronic to acute) would imply spikes reduce risk, which isn’t correct.