alt Hacker NewsReally depends on how you define high-intensity.
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.
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This is what I do. When I was beginning with weight training, I followed other's recommendations back then and pushed hard. Had quite often minor issues or injuries in the joints which set me back for weeks or even months, my tendons seem to be my weak spot and it does get worse with age, both limits and recovery.
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.
Maybe with older adults the baseline goal should be to merely maintain or slow the loss of the muscle, mobility, and cardiovascular capacity they already have? It's not realistic for a 50 year old to think they could build muscle year-after-year for the next 30 years.