REF-299 · MacIntosh BR, Robillard ME & Tomaras EK, 2012 · Applied Physiology, Nutrition, and Metabolism, · Paper · PubMed
Should Postactivation Potentiation Be the Goal of Your Warm-up?
Commentary: PAP dissipates over 4-6 min after the inducing contraction, so it cannot contribute to performance more than 5 min after the warm-up
Key Results
Athletes expect better high-intensity performance after warm-up and assume postactivation potentiation (PAP) contributes; the authors call the evidence for this assumption incomplete
PAP is a product of preceding muscle activation and should improve very brief maximal-effort contractions
PAP fades over the 4-6 min following the contraction that triggers it, so it should not add to performance beyond 5 min after the warm-up
Inference, not tested: because a conditioning activity strong enough to potentiate also fatigues, the net effect on the following effort depends on the balance of the two at the moment of the effort — a point the commentary argues rather than measures
Mechanism
PAP = transiently enhanced force production after a prior contraction (the classical mechanism is myosin regulatory light-chain phosphorylation). The commentary's argument: the potentiation is short-lived (gone within 4-6 min), while the fatigue produced by the same conditioning activity can outlast it — so warming up to "maximise PAP" and then waiting for the call-room, the start gate or a rider ahead removes the potentiation and keeps the fatigue.
Practical Application
Commentary (MacIntosh, Robillard & Tomaras 2012): PAP dissipates within 4-6 min of the inducing contraction, so any potentiation from the warm-up is gone if more than 5 min pass before the effort — a warm-up built around PAP only makes sense when the effort follows almost immediately
The primary, better-supported goals of a warm-up are the general ones (raising muscle temperature, metabolic readiness); PAP is a possible bonus, not the goal
Not from this paper; the base's own practice: test any PAP-style conditioning set in training before using it before a race, and keep the gap between the last hard warm-up effort and the start short
Simpler warm-ups are often as effective — see Tomaras 2011 REF-276
Limitations
Commentary format — not a systematic review; no new data
The abstract is four sentences; the entry's mechanism section is the authors' argument, not a tested result
How this entry was checked and changed
Why this level
regraded 2026-09-27 from B: expert commentary without systematic method
Content correction 2026-09-27
Added the commentary's actual central claim, missing from the entry: PAP dissipates over 4-6 min and should not contribute more than 5 min after the warm-up.
Level B -> C+ (expert commentary, no systematic method); Sport "sprint" -> general; "individual variation very large" and the four-step priority order rewritten as inference/house practice, since the abstract does not state them.