ArmandoChavezUNC wrote: ↑March 24th, 2022, 11:01 am
If your main focus is caloric burn, then you should focus on going as hard as you can for as long as you can. Higher duration = higher caloric burn just like higher intensity = higher caloric burn. Even at intensities that use carbs preferentially over fat as a fuel source the difference isn't that big to where it makes sense to exercise at a lower intensity that burns fewer total calories.
Ordinarily, I'd second this in a heartbeat. But, as I grow older, my older friends remind me with their consistent creaking and groaning that higher intensity comes at a cost. And, often that cost is a desire and/or physical need to either go more easily, or not go at all the following day. I'm by no means advocating a 2k+60s rowing effort, even if you're 100 years old. (if you're that advanced in years, you should be doing whatever you like, really.)
I'm just saying that going full steam for as long as you can, may result in being so drained the following day that you'll be hard pressed to do anything with intensity for a few days, depending on where you're starting.
So, let us assume your typical 30 minute 20 s/m row will burn about 300 calories. Alternatively, let's also assume that a 60 reps of 20 second full out sprints, with 20 seconds rest between each will burn 500.
The day after you've done the sprints, your body cannot repeat the process. But, with the 30/20, your body can. So, which is better?
Now, obviously, we are all different, and certainly in my youth, the sprints wouldn't require any recovery at all and could be repeated with perhaps a 5% reduction in power just an hour later. But, as I get older, with the crappy sleep I get, I'm just not up for anything max effort.
So, just my opinion, backed by nothing but my own anecdotal evidence, so take it for what little it may be worth - if it's calorie burn you're after, consistency is a better approach. Better to burn 300 a day than to burn 500 every other day. Again, that just depends on where you are in your fitness journey.
But, I definitely want to state that no matter where you are on the fitness bell curve, if you wish to improve your fitness on the rower, I would encourage you to keep your active recovery/lower tier rowing efforts to a minimum of 2k+20 to 2k +25, or keep your hr above 60%, but below 75%. No science behind that, just my own anecdotal experience. Opinions will vary, even among experts.