Interesting heart rate anomaly; Joint support; Poison ivy.
I had an interesting indoor cardio session yesterday. I kept the same cadence/RPM as I usually do when I do fasted LISS cardio, but my heart rate was much lower than normal.
On August 29, 2012 I did 14 miles in 46:31, and my average heart rate on that ride was 136 BPM. That’s a pretty normal LISS cardio session for me. Yesterday I did 14 miles in 46:43, but my average heart rate was just 122 BPM.
By the way, my Garmin Edge 500 heart rate monitor matched the built-in heart rate monitor on my recumbent bike, so the data is not an error.
Here’s the August 29, 2012 session compared to yesterday’s session:
I’ve done about a million fasted LISS cardio sessions on this bike, and so I’m very familiar with what cadence I need to ride at a particular level of resistance to get my heart rate where I want it. Specifically, a cadence between 90-100 RPM on resistance level 5 will reliably produce an average heart rate between 135-140 BPM.
So what was different about yesterday’s session? The only thing I can think of is Sunday’s 42 mile ride, during which my average heart rate was 171 BPM (~85% of my max) over a period of more than 4 hours (moving time).
While 42 miles of mountain biking is a distance personal record for me, for a long time I was doing 26-30 mile mountain biking rides an average of 3 times per week. My average heart rate on those ~30 mile rides was generally about the same as it was this past Sunday, perhaps even higher. I was not doing any indoor training at that time, and so I have no way to make the comparison. I wonder if I would have seen similar reduction in heart rate on the trainer during that time?
I’m not really going anywhere with this, I just thought it was interesting. Any theories?
As regular readers know, my supplement intake is very, very limited (for an in-depth look at what I think of supplements and the supplement industry, please check out my March 14, 2012 article “My Take on Supplements“). Right now pretty much the only supplement I take is a multi-vitamin, but I’ve decided to start taking Glucosamine/Condroition/MSM again. I used to take that combo for many years, but at some point I stopped taking it to see if I noticed any difference. I didn’t notice any difference at all, and so I never resumed taking it. Well, after Sunday’s ride I noticed a lot of joint pain, and so I’m going to see if the Glucosamine/Condroition/MSM combo helps on future long rides.
I picked up a little poison ivy on my right leg over the weekend. Thankfully it’s just a small patch near my shin, and it’s not too bad at all. I must fell into a little of it during one of my, um, graceful dismounts. :p