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Reliability of heart rate as a heatstroke indicator

💚 healthpersonal problemSingle report ●●●●● severity 4/5

A middle-aged amateur athlete is unsure if maintaining a low heart rate (Zone 1/2) is a reliable indicator that they are not overheating or at risk of heatstroke while running in high-heat and high-humidity conditions.

Who's affected: An experienced amateur athlete and possibly others who rely on heart rate monitors for safety during outdoor exercise in extreme heat.

⚠️ Single report. This is one person's account. We mark it so until more voices confirm it.

What people do today

🔧 Fix this

Ideas a builder, maker or community group could start on:

  1. A wearable sensor integration that calculates a 'heat stress index' by combining heart rate, skin temperature, and local humidity data.
  2. A mobile app that provides real-time, location-specific warnings when humidity levels make evaporative cooling ineffective for runners.
  3. An educational guide or checklist for athletes on physiological signs of heat exhaustion that occur independently of heart rate spikes.
I want to build this

Real voices

“is a low HR, i.e. in zones 1 or 2 (out of 5) a good indicator that we're not overheating in the current heat waves”

Source: Stack Exchange (fitness) · CC BY-SA 4.0, user-contributed content from Stack Exchange; summarized and modified

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