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I get the feeling some commenters here are misunderstanding this as a lot of the discussions seems to center about weightlifting.
Additionally from what I understood the biggest difference was that the HIIT group lost less muscle while fat loss was roughly the same.
High intensity does border on leading to injury — just making the wrong move — and you’re back to zero intensity?
Where are you getting this? The study was about various intensities of cardio - I didn't see it noted, but I'm guessing the high- and medium-intensity groups were on a treadmill, elliptical, or similar. Pretty small chance of injury for the durations they mention, especially as the subjects were monitored while exercising.
And I'm not really surprised by the study - building lean muscle mass takes resistance training, which wasn't part of the study. The study results appear to be inline with what was common knowledge/experience.
And if you're injuring yourself regularly during weight training or other gym activities, I'd suggest you might hire a good coach/trainer for guidance and programming, because that shouldn't happen either.
After a certain age, it's difficult to train somewhat intensely without risking injury. You can always find some exercises that work and maintain a physical activity, but this may not be enough to maintain your muscle mass or your stamina.
I love me some adult coed soccer. And it can be very high intensity intermittently if you feel like it.
To build muscle, you need to push yourself to a limit. You can reduce the weight and increase the repetitions. This approach is just as effective and lowers the risk of injury.
It's not that unusual for people to pick up e.g. powerlifting past 50 and still get to levels well beyond what most younger adults can lift.
I'm 51, and recently back into powerlifting after many years out of it, and I certainly expect to build back muscle and improving week over week for many years before I can't stem the decline any more, as long as avoid injury or health issues that takes me out of the gym - avoiding time off exercise is the biggest challenge with getting older.
Lowered the load, increased repetitions and basically nothing for a decade. I can still go almost to the failure, I don't even want to reach it since I don't care about that extra bit. Squats or deadlifts are hard even when not at limits, one feels used body parts for a day or two.
I still add cardio on top of that, its just basic logic of moving around a lot is very good for the body, even if effects are not immediately obvious.
That’s just regular ‘ol DOMS and not a problem.
Tendons tend to respond well to both heavy load or high reps, albeit adaptation in either case is very slow.
This is such a strange thing to hear, as someone who also has gone to the gym a couple times per week for my life with a lot of different gym buddies.
I would suggest considering a reset of your gym routine and gym knowledge, possibly with the help of a physical therapist to see what you’re doing wrong.
If you’re going to one of those gyms that encourage dumb things like doing heavy lifts in a timed competition format or other bad ideas that were trendy in the 2010s, I really recommend getting out of those environments.
Some people believe "high intensity" means lifting as much as possible as fast as possible, I'd say more reps and deliberately slow movements are as intense for the purpose of staying in shape/healthy.
Most body weight exercises are virtually impossible to fuck up to the point of injury, done properly they'll keep you fitter than 99% of the population
My son is and once subluxed his shoulder while running
I think the bigger problem is that, as far as I can tell, very few people have the appropriate personality type for high intensity exercise. Most people seem to experience it just as pointless discomfort.
https://www.tandfonline.com/doi/full/10.2147/OAJSM.S394044
Body composition is a factor in health and long life. However there are many confounding factors if that is your goal and so you cannot draw any conclusions unless the sample size is very large, and the study runs over a very long time. Thus we get a lot of small studies that study something easy and hope that this is a good proxy for what we really care about. Sometimes science eventually figures the proxy is good, sometimes not, but often we still don't know. (meta studies have been really helpful here)
Large sample sizes are very expensive to study, a grad student without large grants can study 50-100[1] people alone, which makes the study cheap enough that they can do it. This was a 6 month study, again making it something a grad student could do leaving plenty of time to then write the paper and get it published. (Each subject was studied for 6 months, I'm not clear if they were all studied at once, or if different subjects had different start/end dates). All respect for the grad students who do this - despite all the problems I've pointed out[2], they still did a lot of work.
[1] I've never been a grad student, much less one in a field where you would study this. The 50-100 number feels right in my uneducated opinion, but if someone with more knowledge says something I accept their correction in advance.
[2] I wonder what other problems someone in this field could point out.
That is a conclusion.
general prescription these days for Hypertrophy is 10 sets per muscle group per week 0-3 RIR.
And on a slightly more technical note, recovering from higher volume becomes harder as you age, so focusing on a smaller number (5ish) of reps at higher weight gives you adaptation without quite as much stress.
But I should be clear, when I said real lifting, I don't mean to exclude any form of well calibrated progressive overload, whether that's strength focused or hypertrophy focused. I do mean to exclude the "go to the gym and lift a 10 lb weight the same number of reps each time" BS
According to google: "typical range for total heartbeats is 86,400 to 115,200 beats per day"
I run every day which would add a lot of beats, but my resting HR is 36 (pushed down by exercise i presume) with a daily average of 50 BPM. So in total a trained person may spend less of their heart beats.
But it is very wrong otherwise, joints for example will suffer if not moved. Blood will only flow into all the areas of the joints if they are moved. And if you don't move, your muscles will be gone and without muscles to hold your joints, loss of stability, great risk of injury, etc.
I don't believe the limited heartbeats theory, but it does support the idea of exercise.
If people work out, or play sports, without knowing proper form, without using protection or precautions, they'll get injured and then worse off than before. Realistically, manual laborers should be in real good shape, but often their jobs are so low-wage, and they're so interchangeable, that safety precautions are ignored and must be regulated/enforced.
I took up roller skating and was rewarded with a broken leg. I took up gym exercise and was repaid with a hernia. Both required surgery. No regrets! Only wished I could've better understood how to exercise safely!
I once encountered a FB group that was for people to discuss "sports injuries sustained while we were in bed" and I could totally relate, having done weird stuff to my shoulder overnight, rather than pitching a baseball game...