Passive torque influences the Hoffmann reflex pathway during the loading and unloading phases of plantar flexor muscles stretching
| Autor: | Hasnae El Khalouqi, Charel Dahm, Stéphane Baudry, Mehdi Datoussaid, Nathalie Guissard |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Muscle fascicle
Male Reflex Stretch Physiology Muscle spindle 030204 cardiovascular system & hematology homosynaptic depression 03 medical and health sciences Young Adult 0302 clinical medicine Nuclear magnetic resonance Homosynaptic Depression Physiology (medical) medicine QP1-981 Humans Golgi tendon organ Muscle Skeletal Hoffmann reflex Chemistry ultrasound Interstimulus interval Neural Inhibition Original Articles musculoskeletal system Evoked Potentials Motor Passive torque medicine.anatomical_structure Torque Synapses Reflex Original Article Female muscle spindle 030217 neurology & neurosurgery Ib afferents Muscle Contraction |
| Zdroj: | Physiological Reports Physiological Reports, Vol 9, Iss 8, Pp n/a-n/a (2021) |
| ISSN: | 2051-817X |
| Popis: | This study investigated the influence of passive tension on Hoffmann reflex during the loading (muscle stretched by passive joint movement) and unloading phase (joint returned to initial position) of muscle stretching. The maximal H‐reflex amplitude (H max) was recorded in soleus in 19 young adults during the loading and unloading phases of a passive 30° dorsiflexion, from 90° ankle angle (reference position). H max was evoked at similar angles (protocol‐1) or similar passive torque (PT; protocol‐2) during the loading and unloading phases, or during two loading phases separated by a 5‐min stretch hold at 30° ankle dorsiflexion relative to the reference position (protocol‐3). Homosynaptic depression (HD) was assessed with paired H reflexes (0.5‐s interstimulus interval) during the loading and unloading phases (protocol‐4; n=13). In protocol‐1, PT was lesser and H max greater during the unloading than the loading phase (p Hypothetical mechanisms involved in the increase in the responsiveness of the H‐reflex pathway with the decrease in passive tension of the muscle‐tendon unit in response to acute stretching (PAD: primary afferent depolarisation interneurons). |
| Databáze: | OpenAIRE |
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