Key result
Lengthening contractions showed a disproportionate early EMG increase compared to isometric contractions, with motor units recruited at greater force thresholds.
Population
20 decerebrate cats (soleus and medial gastrocnemius muscles)
Comparison
Lengthening (stretch reflex) contractions vs Isometric contractions
Design
Preclinical
Authors
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Highlights species-specific motor control; leaves open translation to human cardiovascular or neuromuscular function.
In decerebrate cats, motor-unit recruitment and rate modulation differ between lengthening and isometric contractions, with recruitment of new motor units likely being the most effective compensatory mechanism to prevent muscle yield at low to moderate initial force.
Cordo et al. (1982) studied this question. Lengthening (stretch reflex) contractions vs. Isometric contractions was evaluated on Motor-unit recruitment and rate modulation patterns. Lengthening contractions showed a disproportionate early EMG increase compared to isometric contractions, with motor units recruited at greater force thresholds.
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