The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
The Henneman size principle is kind of a foundational principle within muscle physiology but many people have come to interpret it by saying that the way to recruit high threshold motor units, the ones that are hard to get to is to just use heavy weights.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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so what happens is when you do low velocity exercise or low velocity movement like right now right I'm doing all these things I'm using low threshold motor units and these tend to be slow switch ones so makes sense if I go to scratch my eyeball I don't want to be producing Max Force and not a good strategy right and so fact the best strategy is you start with the lowest Force output humanly possible and then you work your way up and that's because this principle another one called all or none which means when a muscle fiber contracts it contracts with a 100% effort you can't regulate it up and down there's no dimmer switch it goes on off on off so the only way you regulate Force production is to increase or decrease the total amount of motor units that are activated because when you activate a motor unit all the fibers get activated and all of them get activated at 100% contraction right