Abstract
Purpose
This study aimed to determine whether the modulation of primary afferent depolarization (PAD) and homosynaptic post-activation depression (HPAD) are involved in the lower efficacy of Ia-afferent-α-motoneuron transmission commonly observed during lengthening compared to isometric and shortening conditions.
Methods
15 healthy young individuals participated in two experimental sessions dedicated to measurement in passive and active muscle states, respectively. In each session, PAD, HPAD and the efficacy of Ia-afferent-α-motoneuron transmission were evaluated during lengthening, shortening and isometric conditions. PAD was evaluated with D1 inhibition technique. Posterior tibial nerve stimulation was used to study HPAD and the efficacy of the Ia-afferent-α-motoneuron transmission through the recording of the soleus Hoffmann reflex (H reflex).
Results
PAD was increased in lengthening than shortening (11.2%) and isometric (12.3%) conditions regardless of muscle state (P < 0.001). HPAD was increased in lengthening than shortening (5.1%) and isometric (4.2%) conditions in the passive muscle state (P < 0.05), while no difference was observed in the active muscle state. H reflex was lower in lengthening than shortening (− 13.2%) and isometric (− 9.4%) conditions in both muscle states (P < 0.001).
Conclusion
These results highlight the specific regulation of PAD and HPAD during lengthening conditions. However, the differences observed during passive lengthening compared to shortening and isometric conditions seem to result from an increase in Ia-afferent discharge, while the variations highlighted during active lengthening might come from polysynaptic descending pathways involving supraspinal centres that could regulate PAD mechanism.
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Data availability statement
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- ANOVA:
-
Analysis of variance
- EMG:
-
Electromyography
- HPAD:
-
Homosynaptic post-activation depression
- H reflex:
-
Hoffmann reflex
- MVC:
-
Maximal voluntary contraction
- PSI:
-
Presynaptic inhibition
- PAD:
-
Primary afferent depolarization
- SOL:
-
Soleus
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All authors conceived and designed research. JC conducted the experiments and collected the data. JC analyzed the data. JC, JD, TC and MJ drafted the manuscript. All authors provided critical appraisal to the manuscript and approved the final version.
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Colard, J., Jubeau, M., Duclay, J. et al. Regulation of primary afferent depolarization and homosynaptic post-activation depression during passive and active lengthening, shortening and isometric conditions. Eur J Appl Physiol 123, 1257–1269 (2023). https://doi.org/10.1007/s00421-023-05147-x
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DOI: https://doi.org/10.1007/s00421-023-05147-x