Lower limb suspension induces threshold-specific alterations of motor units properties that are reversed by active recovery.

It should be noted, however, that tracked MUs showed a trend similar to that observed in the total pool, suggesting that significant alteration of DR modulation might become apparent with longer-term unloading or more severe models of disuse, as previously suggested. 5 Indeed, the work of Duchateau and Hainaut 5 on hand muscles reported a larger reduction in DR modulation for lower- compared to higher-threshold MUs after 6–8 weeks of hand cast immobilization.

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