The recent article by Drs. Bejder and Nordsborg (http://doi.org/10.1249/JES.0000000000000144) on the weakness of scientific evidences supporting that the hypobaric or normobaric "live high-train low" (LHTL) method improves sport-specific exercise performance has the merit of recalling the importance of careful methodological design for future altitude-related research. Although we agree that double blinding, inclusion of a normoxic control group, implementation of a lead-in period, adequate sample size, and statistical power are paramount to minimize the potential biases (e.g., placebo or nocebo effect, training content or trainability influence), several comments would merit consideration. Response by Bejder and Nordsborg : http://doi.org/10.1249/JES.0000000000000165
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