Heart rate variations for a given intensity
A reduction in heart rate for a given intensity is usually due to an improvement in fitness but a number of other factors might explain why heart rates can vary for a given intensity:
- Dehydration can increase the heart rate by up to 7.5%
- Heat and humidity can increase the herat rate by 10 beats/minute
- Altitude can increase the heart rate by 10 to 20%, even when acclimatised
- Biological variation can mean the heart rate varies from day to day by 2 to 4 beats/minute
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