mild heat stress raises heart rate by ~16 bpm and amplifies cardiovascular effort during exercise
Exercise-induced hyperthermia (core body temperature reaching 39.6 ± 0.5°C) under moderate ambient heat stress (28–30°C) significantly increased heart rate by 16 bpm and rating of perceived exertion by 4 units compared to temperate conditions, reflecting amplified cardiovascular and sympathetic strain.
What this means for you
When your body works harder under heat, your cardiovascular system gets a more intense workout at the same physical effort level. This kind of amplified demand can support cardiovascular conditioning and help your body adapt to stress more efficiently over time — similar to how altitude training works for endurance.
The published research
Impact of moderate environmental heat stress during running exercise on circulating markers of gastrointestinal integrity in endurance athletes
Physiological Reports · 2025
This page describes a documented finding about the underlying wellness technology. It is not a marketing claim about any specific device. For information about HOCATT specifically, visit hocatt.com.