TRAINING STRESS BALANCE
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Managing training load is crucial in injury prevention and treatment.
A 2013 paper, introduced the concept of "Training-Stress Balance":
Spikes in acute workload are associated with increased injury risk in elite cricket fast bowlers. (Billy T Hulin, Tim J Gabbett, Peter Blanch, Paul Chapman, David Bailey, John W Orchard, 2013.)
The authors measured the acute workload of the last 7 days (and call it “fatigue”) and compare that to the chronic workload of the previous 4 weeks (which they call “fitness”).
We can accurately account for a mixed training program, that may include a variety of hills / sprints / cross training etc, by giving each session a rate of perceived exertion (RPE) out of 10, and multiply that score by the number of training minutes:
Training load = session RPE x duration (minutes)
This is called a Foster’s Score, and provides a simple method for quantifying training loads from a variety of different training modalities.
The research subtracted the current one-week average from the previous 4-week average and called this number the “training-stress balance”.
A negative training-stress balance increases the risk of injury by 4 times.
To summarise:
[Last 7 days’ session RPE x duration (minutes)] - ([Last 4 weeks’ session RPE x duration (minutes)] / 4) = TRAINING-STRESS BALANCE
Negative balance = 4 times risk of injury
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