Eli5 the relationship between heart rate and fitness level/stamina

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I (38f) was hiking with my partner (49m). I was feeling fine and would have liked to go faster but he was huffing and puffing and needed lots of breaks. His heart rate was around 130, while mine was up around 160. I have always heard that having a slower heart rate is a sign of better cardio fitness, but I work out more and have much better stamina during exercise than he does. What’s that about?

(Edited because I forgot how old I am)

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4 Answers

Anonymous 0 Comments

Lower heart rate for the same amount of work (amount of force required to move a certain distance) means your cardiovascular system is good/efficient. You are transporting oxygen to your muscles with a combination of breathing and heart rate. Him beign winded probably had more to do with a male is heavier and has more mass to move, which requires more force, which requires more oxygen to feed the muscles to do so. If you wore a weighted vest that made you as heavy as he was, you would probably be breathing heavily as well, and you might even have a higher heart rate than what you had. Youd need more oxygen to feed your muscles to push the extra mass.

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