Key result
Increasing the stimulus rate applied to cat single motor units to levels used during spike-triggered averaging decreased contraction time, half-relaxation time, and twitch amplitude.
Population
Cat single motor units (slow versus fast twitch)
Comparison
Increasing stimulus rates to those typically… vs Lower stimulus rates (unfused twitch)
Design
Preclinical
Authors
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Technique may confound twitch analysis in slow units via fusion; leaves open validity of prior motor unit data in animals and humans.
The spike-triggered averaging technique alters the mechanical characteristics of observed twitches due to fusion of tension, particularly in slow-contracting motor units.
Calancie et al. (1986) studied this question. Increased stimulus rate vs. Lower stimulus rates was evaluated on Changes in contraction time, half-relaxation time, and twitch amplitude. Increasing the stimulus rate applied to cat single motor units to levels used during spike-triggered averaging decreased contraction time, half-relaxation time, and twitch amplitude.
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