aussie nick wrote: ↑November 3rd, 2021, 12:45 am
I can only offer my own experience with rowing this year, which may be a little helpful to the original question.
I hadn't done any conditioning work for years prior to Jan when I started rowing 3x per week....an interval , a 5-10k and a time trial. my RHR averaged about 68 when I started and within a few months it dropped to an average of 63/64 where it stayed til about July.
at that point, I added more steady distance to my training and an extra day/two days of training per week. So I was doing 1-2 intervals/AT type sessions and then 2-3 longer steady rows of 50-80 mins. Almost immediately, my RHR dropped to where it is now which is 57/58 ish. So my experience would be that the longer steady stuff and just more time in general training was what contributed.
I would also caution a little against using RHR as the be all and end all. When I was playing rugby, I used to win every beep test and other conditioning tests that my clubs held and never had a RHR below 55, whereas people with far lower RHR couldn't compete. I'm sure it's an excellent guide, but my guess would be that it's an indicator and not 'proof'. But again...I'm not an expert and haven't done any research on the subject
Let me make a comment about your rugby experience and aerobic fitness in general. The body tries to adapt to the stimulus it regularly sees. If the body sees the need for.a lot of strength it develops muscle fibers to facilitate that effort. If there is a lot of constant low intensity efforts (chasing down animals for instance) then it develops capillaries to deliver more oxygen to those muscles improving that ability. The muscles do not have enough room to have more muscle fibers and more capillaries so it is not possible to optimize both.
It is generally considered that the minimum effort to see any aerobic benefit is 20-30 minutes constant effort 3 X per week. The fitness tests for rugby players I suspect focused more on strength and speed and not traditional endurance (10k or longer run). I consider Rugby a burst sport, not much aerobic effort involved.
So, we are all a bit different. But, as you reported, as you have increased your aerobic training your RHR has come down. Continue what you are doing for another year it should come down some more a ibt. If you were to increase those long efforts to 5 days a week with 1 long row (2-2.5 hrs) with one rest day you would see it come down more.
The problem, of course, is few of us train to simply see how low we can get our RHR. We train to feel better, look better, or our races last 10 minutes. RHR has some usefulness to everyone to monitor overtraining or sleep for instance but it isn't an endpoint per say.