Chapter 19 Do Lengthening Contractions Represent a Case of Reversal in Recruitment Order?
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Cited by (30)
Effects of ageing on motor unit activation patterns and reflex sensitivity in dynamic movements
2010, Journal of Electromyography and KinesiologyCitation Excerpt :This would indirectly support Hennemans size principle on the orderly recruitment of MU’s (Henneman et al., 1965a,b), as the selective recruitment of larger units in ECC should have increased the mean spike amplitude either through new, larger, spikes, or through the derecruitment of spikes with smaller amplitudes. The preservation of size principle has been found in ECC contractions in several studies (Bawa and Jones, 1999; Garland et al., 1996; Kossev and Christova, 1998; Pasquet et al., 2006; Sogaard et al., 1996), while some evidence of a reversal of recruitment exists (Howell et al., 1995; Nardone et al., 1989). The present results of similar mean spike amplitudes in all contraction types would not imply a previously reported lower threshold of MU recruitment in dynamic contractions (Ivanova et al., 1997; Linnamo et al., 2003; Tax et al., 1989).
Distinct brain activation patterns for human maximal voluntary eccentric and concentric muscle actions
2004, Brain ResearchCitation Excerpt :A different motor unit recruitment pattern may reflect a unique nervous system control strategy for eccentric movements, and that strategy may need greater cortical activity to carry it out. However, other studies [6,45] suggested that selective recruitment of high-threshold motor units does not occur during human wrist flexor eccentric contractions. Studies [1,41] using transcranial magnetic stimulation (TMS) of the brain to examine excitability of corticospinal neurons also support the notion of different control strategies for eccentric and concentric muscle actions.
Recruitment of single human low-threshold motor units with increasing loads at different muscle lengths
2004, Journal of Electromyography and KinesiologyMotor unit activation patterns during isometric, concentric and eccentric actions at different force levels
2003, Journal of Electromyography and Kinesiology