Interval Throwing Programs of Various Duration for Baseball Players Based on Biomechanical Workload Data.
Michael M Reinold, Brittany Dowling, Glenn S Fleisig and 6 others
PMID 41939956WHAT IT FOUND
A modelling paper, not a trial: four interval throwing programs of 6 weeks, 12 weeks, 5 months and 7 months, built so throwing load stays inside the 0.7 to 1.3 ratio.
No athletes were followed, so none has been tested for return to play.
Key findings
01The 6-week program runs 42 days: 28 days of flat-ground throwing with 19 throwing days, then 14 days of mound work with 10 throwing days including four bullpens.
02The 12-week program runs 84 days and ends at a chronic workload of 7.9, with the ratio of recent to longer-term throwing load staying between 0.7 and 1.3 for 98% of the program.
03The 5-month program runs 140 days and ends at a chronic workload of 10.0, staying between 0.7 and 1.3 for 95% of the program.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
No athlete was followed through any of these four programs. The paper reports day counts and modelled workload ratios, not return-to-play rates, re-injury, or how many athletes complete the progression. The workload figures rest on estimated elbow varus torque derived from throwing distance in 34 healthy college players, so they may not reflect what an injured athlete at a different age, level or body size actually loads. The paper's statement that these programs return athletes without setbacks or re-injury comes from the authors' own experience, described in the text as anecdotal, not from data collected on it. The model is built on elbow loads; the authors note it does not necessarily apply to the shoulder, though they use it for shoulder and elbow injuries on the basis that throwing shoulder internal rotation torque is similar in size to elbow varus torque. The programs were not compared with each other or with any other return-to-throw approach, so the claim that they keep workload steadier than traditional programs is a design property, not a tested outcome.
Declared interests
Not reported in the text supplied. There is no funding statement and no conflict-of-interest declaration among the sentences given. The methods name the commercial wearable used to collect the throwing data (Driveline Pulse, Driveline Baseball), and its placement was verified by one of the authors throughout data collection.
The easy way to misread this
Do not read these four programs as tested treatments. No players were followed through any of them, and the authors' claim that athletes return without setbacks is described in the paper itself as their own experience, not a measured result. Every load figure comes from modelled throwing by healthy college players, not from injured athletes.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →