REF-1207 · Chapman et al., 2014 · Journal of Applied Physiology · Paper · PubMed

How many days after an altitude camp should I race?

No settled answer: leading altitude researchers call it a key open question, likely set by how blood, breathing and mechanics de-acclimatise. Any day count is practice.

B+moderate evidenceMeasured on highly trained to world-class athletes

Chapman and colleagues start from the observation that, although many studies guide how to carry out altitude training, the proper timing of the return to sea level before a major competition remains unanswered.

From the evidence they review, they conclude that the de-acclimatisation of haematological, ventilatory and biomechanical factors after descent likely interacts to determine the best timing for competitive performance. That is the whole of the abstract: it gives no recommended window, does not say which factor dominates, and does not say how many studies it draws on.

The full text (American Physiological Society) was not retrievable for this entry, so any day window attributed to this review elsewhere must be checked against the full text before it is used.

Our reading: the abstract, from a leading altitude group, calls race timing after descent unresolved, which fits the base's silence on a post-camp race window (SYNTH-06); whether the full review proposes a window cannot be known from the abstract. Inference: if the three processes fade at different rates, the decision is a trade-off between them.

Protocol

Design: narrative review; search method, inclusion rules and the number of studies reviewed are not given in the abstract (n = not applicable).
Scope (from the abstract): de-acclimatisation after return from altitude training in three domains — haematological, ventilatory and biomechanical — and its bearing on when to compete at sea level.
Not given in the abstract: any time course, any study population, any performance data, and funding or conflicts.

Key Results

The timing of the return to sea level before major competitions is described as a key unanswered question, despite many published studies on how to carry out altitude training (abstract).
Three factors are named: the de-acclimatisation of haematological, ventilatory and biomechanical responses after descent, which "likely interact" to determine the best timing (abstract; the authors' hedge).
No window, no numbers: the abstract gives no number of days, no effect size and no study count.

Mechanisms

Authors' interpretation (abstract): the blood, breathing and movement adaptations to altitude each decay after descent, and their combined course sets when sea-level performance is best.
Inference: if the three processes do not share one time course, a single "race N days after coming down" rule is necessarily a compromise between them, and the best day may differ between athletes and events. Which process dominates, and when, cannot be read from the abstract.

Practical Application

How many days after an altitude camp should I race? No settled answer: leading altitude researchers call it a key open question, likely set by how blood, breathing and mechanics de-acclimatise. Any day count is practice.
What the base can say: a live-high-train-low camp can be worth a few per cent at sea level with a wide individual spread (REF-210, A; REF-209, B+ for the dose), and 1 g of haemoglobin mass is worth about 4 mL/min of VO2max (REF-464, B+); how fast that gain fades after descent is not in any entry (SYNTH-06, "After the camp").
Not from a study; the base's own practice: pick the race date with the athlete's own record after earlier camps if there is one, keep the taper unchanged (SYNTH-34), and log how the first races after a camp went so the next decision rests on this athlete's data.
Heat is the better-measured analogue: heat-acclimation decay and re-induction have been pooled (REF-1197); altitude has no equivalent synthesis in the base.
For the periodisation around camps (when in the season, how they meet the peak), see the companion narrative review by Mujika, Sharma and Stellingwerff (REF-1208, B+).

Limitations

Abstract only. The full text at the publisher was blocked to automated retrieval and is not in PubMed Central; the review's evidence, any time windows it proposes, and the authors' conflicts and funding could not be read.
Narrative review. No systematic search is described in the abstract, and the conclusion is hedged ("likely interact").
No data in this entry. Nothing here supports a specific number of days; quoting one from this refId would be quoting something this entry has not seen.
How this entry was checked and changed
Why this level

authoritative narrative review from a leading altitude group (Chapman, Levine, Lundby), the rubric's line, as for REF-1208 and REF-1196, also read from the abstract only; its two-sentence abstract carries one qualitative claim and no method, studies or numbers, so nothing quantitative may be cited from this entry