OK, if we go with Enoka as the definitive source on these matters I see that in a paper entitled The Steadiness of Lengthening Contractions by Christou, Tracy, and Enoka in 2001 they state:
Recent interest in the neural control of lengthening contractions was heightened by the observation (Nardone et al., 1989) that the recruitment order of motor units may deviate from that prescribed by the Size Principle (Henneman, 1957). Nardone et al. (1989) found that high-threshold motor units were selectively activated during lengthening contractions with the triceps surae muscles. Furthermore, when motor unit activity was recorded from the first dorsal interosseus while lifting and lowering a load, Howell et al. (1995) found that three high threshold motor units out of 21 recorded were selectively recruited during lengthening contractions. In contrast, a number of studies have failed to find evidence of selective activation of high-threshold motor units during lengthening contractions (Bawa & Jones,1999; Christova & Kossev, 2000; Kossev & Christova, 1998; Laidlaw et al., 2000; Sogaard et al.,1996). These results suggest that although recruitment order may be disrupted during lengthening contractions, the most common strategy is not to alter the recruitment order (Enoka & Fuglevand, 2001).
I am not clear from the last line whether Enoka has altered his position since his 1996 paper but clearly the exception to the size principle is not established beyond doubt and the more recent studies argue in favour of the principle.
Of course whether or not HTMU’s are preferentially recruited may not matter from a practical of view if the “drop catch” method is a superior method of recruitment.
I am however having difficulty in considering how this approach should be applied to hypertrophy.
RJ24 has suggested following I believe the work of Schroeder that we engage in an extended isometric following the drop catch method.
I wonder how many people have used this successfully. It has been around some time but perhaps tellingly has not become a mainstream method of training. Even if it works how many people would want to spend their time training like that?
Squattin600 you say:
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That the method is not an isometric at all rather a very slow eccentric (or yielding isometric as CT would call them) - My understanding is that what Schroeder proposes is an extended isometric but you or Roger may be able to clarify if we are talking about different methods here and comment on which you think is better for hypertrophy.
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That if the data that RJ provided is correct than the iso/slow ecc actually preferentially recruit the HTMU’s and increase their TUT, which should subsequently lead to greater hypertrophy-I am not sure if it is being argued that it is the isometric /slow eccentric which is preferentially recruiting the HTMU’s. My understanding is that it is argued that they simply extend TUT once the HTMU’s have been recruited. Roger will no doubt clarify.