Layered clothing during cold endurance training as a practical strategy to mitigate perceptual strain in the heat: strengths and limitations.

Yamaguchi et al. demonstrate that five days of endurance cycling in the cold (10 °C) with layered clothing elevates thermal strain during training and selectively reduces perceptual strain (RPE and TS) during subsequent exercise in the heat. This letter highlights the practical value of the approach while discussing limitations related to thermoregulatory adaptations, performance testing, and generalizability.