Holy confounders Batman.
Yes, someone who is unable to climb the stairs might not be long for this world but...making them sprint up a staircase is unlikely to prolong (rather than shorten) their lives.
Yes, someone who is unable to climb the stairs might not be long for this world but...making them sprint up a staircase is unlikely to prolong (rather than shorten) their lives.
The direction of causation could be reversed too. It might be that inactivity is a sign of deteriorating biological systems.
I think we could probably agree with this advice based on strong priors but this paper provides poor support for the advice since it's not an intervention, it's an observation of extreme sedentary "lifestyles" which are probably heavily skewed towards various forms of illness (or infirmity from old age).
The smartest way to do it is probably to increase both frequency and intensity progressively, which means your body can make small adaptations over time without putting undue stress on the joints, tendons, bones, cardio-vascular system etc.
Those can then cause a stroke when they obstruct blood flow to something critical. The stroke may be fatal, or maybe you just loose capabilities like motor control of half your body.
Either way, there's a reason many people are advised to consult with their physician before beginning an exercise regimen.
Stay active folks...
Also, I can't help wondering whether this study's results are applicable to what they call a "stress test" at your doctor's. Or is that beyond the regime they were examining.