Abstract
Research in movement science aims at unravelling mechanisms and designing methods for restoring and maximizing human functional capacity, and many techniques provide access to neural adjustments (acute changes) or long-term adaptations (chronic changes) underlying changes in movement capabilities. First described by Paul Hoffmann over a century ago, when an electrical stimulus is applied to a peripheral nerve, this causes action potentials in afferent axons, primarily the Ia afferents of the muscle spindles, which recruit homonymous motor neurons, thereby causing an electromyographic response known as the Hoffmann (H) reflex. This technique is a valuable tool in the study of the neuromuscular function in humans and has provided relevant information in the neural control of movement. The large use of the H reflex in motor control research on humans relies in part to its relative simplicity. However, such simplicity masks subtleties that require rigorous experimental protocols and careful data interpretation. After highlighting basic properties and methodological aspects that should be considered for the correct use of the H-reflex technique, this brief narrative review discusses the purpose of the H reflex and emphasizes its use as a tool to assess the effectiveness of Ia afferents in discharging motor neurones. The review also aims to reconsider the link between H-reflex modulation and Ia presynaptic inhibition, the use of the H-reflex technique in motor control studies, and the effects of ageing. These aspects are summarized as recommendations for the use of the H reflex in motor control research on humans.
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Abbreviations
- EMG:
-
Electromyography
- EPSP:
-
Excitatory postsynaptic potential
- H reflex:
-
Hoffmann reflex
- H max :
-
Maximal amplitude of the Hoffmann reflex
- IPSP:
-
Inhibitory postsynaptic potential
- MN:
-
Motor neurone
- M wave:
-
Compound muscle action potential
- M max :
-
Maximal amplitude of the compound muscle action potential
- PAD:
-
Primary afferent depolarisation interneurones
- PICs:
-
Persistent inward currents
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Theodosiadou, A., Henry, M., Duchateau, J. et al. Revisiting the use of Hoffmann reflex in motor control research on humans. Eur J Appl Physiol 123, 695–710 (2023). https://doi.org/10.1007/s00421-022-05119-7
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DOI: https://doi.org/10.1007/s00421-022-05119-7