Rhonda Patrick· PhD
So the more vigorous exercise you're engaging in just even if it's just chores, even if it's if you pick up a box, you're engaging type two fibers depending on how heavy that box is.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
So the more vigorous exercise you're engaging in just even if it's just chores, even if it's if you pick up a box, you're engaging type two fibers depending on how heavy that box is.
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Um, but it is important to point out that um as you're getting older as you mentioned you know the muscle mass engaging the type 2 fibers because they're really going uh your cardiorespiratory fitness is is decreasing. I mean all of these things there's so much I would say um there's so many reasons why older adults should be trying to engage in some form of vigorous intensity activity and not just following the moderate intensity aspect of the guidelines.
So most people will be aware that muscle fibers are categorized into different types. We have type one which are referred to as slow twitch muscle fibers. Then we have type two. ... type two or fast twitch, type one or slow twitch fibers. ... type two fibers are the type of fibers that will atrophy first and lose strength first with with age.