Differential control of H-reflex amplitude in different weight-bearing conditions in young and elderly subjects

Highlights ► The soleus (SOL) maximum evoked H-reflex (H-max) was associated with the corresponding background EMG (bEMG) activity for the elderly subjects who increased the bEMG activity as they increased their body-weight-bearing conditions. ► The young subjects had an ability to modulate their de...

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Bibliographic Details
Published in:Clinical neurophysiology 2012-10, Vol.123 (10), p.2018-2024
Main Authors: Tsuruike, Masaaki, Kitano, Koichi, Koceja, David M, Riley, Zachary A
Format: Article
Language:English
Subjects:
Adult
Adult and adolescent clinical studies
Age Factors
Aged
Aging - physiology
Biological and medical sciences
Depression
Elderly
Electrodiagnosis. Electric activity recording
Electromyography
Female
Femoral Nerve - physiology
H-reflex
H-Reflex - physiology
Humans
Investigative techniques, diagnostic techniques (general aspects)
Male
Medical sciences
Middle Aged
Mood disorders
Motor Neurons - physiology
Muscle, Skeletal - physiology
Nervous system
Neurology
Posture - physiology
Presynaptic inhibition
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Weight bearing
Weight-Bearing - physiology
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Summary:Highlights ► The soleus (SOL) maximum evoked H-reflex (H-max) was associated with the corresponding background EMG (bEMG) activity for the elderly subjects who increased the bEMG activity as they increased their body-weight-bearing conditions. ► The young subjects had an ability to modulate their descending tonic ongoing presynaptic inhibition imposed on the Ia afferents of the femoral nerve (FN) from non-weight-bearing condition to weight-bearing condition, whereas the elderly subjects did not. ► In the elderly group, it is considered that input from the vestibulospinal tract is insufficient to induce presynaptic inhibition upon Ia fibre connection to the motoneuron.
ISSN:1388-2457
1872-8952
DOI:10.1016/j.clinph.2012.03.006