Abstract
Hot-water immersion (HWI) is increasingly promoted as a simple, non-pharmacological strategy to improve cardiovascular health (Roxburgh et al., 2026). Acute laboratory studies consistently demonstrate substantial reductions in diastolic blood pressure during and immediately after heat exposure (Price et al., 2025); effects on systolic blood pressure appear more variable. However, whether any acute responses translate into meaningful changes in daily blood pressure regulation remains unclear. In this issue of Experimental Physiology, Leaney et al. (2026) provide a timely and methodologically robust examination of this question using 24 h ambulatory blood pressure monitoring in healthy adults.