"Strong" isn't very specific. Would that be 1.5 G, 2G, 3G or more?
The ability to function for long periods would probably be influenced by the individual's age, their amount of experience in the high G environment and their physical fitness. I would expect animal tests in centrifuges before humans were exposed to such conditions.
Even healthy adults might need some assistance getting blood back up to the heart from the feet with more than marginally stronger gravity.
I'm not aware of any place in this
solar system with higher surface gravity than Earth other than the gas giants, where gravity is so strong human survival would probably be impossible.