But, does it matter? Unless you’re doing something that requires lifting a weight or object (like a powerlifter or strongman) for a full ROM, static training or partials will stimulate or help maintain lean body mass.
Pete Sisco pointed out years ago – and this still makes perfect sense – that when we push or move something in real life, we naturally do it in our ‘strongest’ range if possible. Our body instinctively uses this range and it is where the highest % of muscle fibers are engaged.
John Janquish’s X3 Bar videos, articles – while a +$500 product – takes advantage of this – not too different from the Nautilus cam design/approach. (Less expensive options are available, obviously.) On the pressing movement, the most resistance is takes place at the strongest point of the movement and the resistance falls off as the bar is lowered whether with bands or a Nautilus cam.
And that was the big complaint with Nautilus: it wasn’t 1:1 with a barbell – eg you couldn’t train the “weak” part of your lifts, but, Jones acknowledged this and explained the efficiencies and design of the cam and why overload was optimized at the optimal range where the most muscle was involved with those machines.
Same thing with statics. Personally, I’ve incorporated more partials, more isometrics into my training as there’s no point in going through full ROM and putting my joints through the grind. (Lighter weights, bodyweight? No worries there.) Anyone remember one of the first SuperSlow gym owners, Steve Maxwell? He talks about his return to slow reps and isometrics for this reason.