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Knee Pain Gone and Perceived Exertion Low but Heart Rate High?

  • 34M 6'0 SW 345, CW:287, GW: 185, Desk job, working from home father of 3

Since dropping a good junk a weight one thing that I have started to noticed is that cardio no longer feels like such a chore. It felt like such an abrupt change so when I really thought about it I realized that not only did my knees not hurt with every step but also the arches of my feet did not ache as well. Previously I almost exclusively did elliptical at the gym (I walk outside) but when I was at my highest even that felt like a lot of work because of the pain.

However, I have noticed change to my heart rate as measured by the machine. When I realized that my perceived exertion was low but my output (measured by watts, I was at 275 for about 5 mins) was high I decided to check my heart rate expecting to see something around the 130-140 BPM range and was looking to gloat to myself about the positive changes to my cardio. I was really surprised to see it at 174. I was not out of breath and I did not notice my heart rate like I would in the past. I know this is technically still in a safe range for my age, and that if I am actually concerned I should speak with a doctor. Recently I have started phentermine and I am wondering if maybe this could be a side effect since phentermine is a CNS. Since starting phen. I have decreased caffeine intake just to be safe so that is why I was so surprised. I have now noticed it on multiple different cardio machines of different brands so I dont think it was an anomaly related to that particular machine. Wondering if anyone has experienced this in the past and especially if they were on phentermine?

IN CASE HELPFUL:

  • Recently started phentermine
  • Usually high caffeine user and have reduced since starting phentermine
  • Resting heart rate is around 60-64 BPM
  • Blood pressure 116/74
  • Perceived exertion is low when machine is measuring these results
  • Respiration rate was comfortable and low when HR measured, but I am not measuring this
submitted by /u/TheMexicanLeprechaun
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from loseit - Lose the Fat https://www.reddit.com/r/loseit/comments/pxvfqp/knee_pain_gone_and_perceived_exertion_low_but/

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