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Budini, F; Gallasch, E; Christova, M; Rafolt, D; Rauscher, AB; Tilp, M.
One minute static stretch of plantar flexors transiently increases H reflex excitability and exerts no effect on corticospinal pathways.
Exp Physiol. 2017; 102(8):901-910 Doi: 10.1113/EP086374 [OPEN ACCESS]
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Co-Autor*innen der Med Uni Graz
Christova Monica
Gallasch Eugen

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What is the central question of this study? What mediates neural responses following static stretching, and how long do these influences last? What is the main finding and its importance? This study shows that 1 min of static stretching inhibits the tendon tap reflex and facilitates the H reflex without influencing motor-evoked potentials. The results indicate that at least two different mechanisms mediate neural responses after static stretching. The purpose of this study was to determine whether the neural responses observed after static stretching are mediated by sensitivity of muscle spindles, spinal excitability or cortical excitability and how long these influences last. Nineteen volunteers (25.7 ± 5.6 years old) were tested for the tendon tap reflex (T-reflex), H reflex and motor-evoked potentials on ankle flexors and extensors immediately, 5 and 10 min after 1 min static stretching applied at individual maximal ankle dorsiflexion, as well as immediately, 5 and 10 min after a control period of the same duration. Comparison of measurements collected immediately after stretching or control conditions revealed that the T-reflex was weaker after stretching than after control (-59.2% P = 0.000). The T-reflex showed a slow recovery rate within the first 150 s after stretching, but 5 min after the inhibition had disappeared. The H reflex increased immediately after stretching (+18.3%, P = 0.036), showed a quick tendency to recover and returned to control values within 5 min from stretching. Motor-evoked potentials were not affected by the procedure. These results suggest that 1 min of static stretching primarily decreases muscle spindle sensitivity and facilitates the H reflex, whereas effects on the motor cortex can be excluded. © 2017 The Authors. Experimental Physiology © 2017 The Physiological Society.
Find related publications in this database (using NLM MeSH Indexing)
Adult -
Ankle - physiology
Ankle Joint - physiology
Evoked Potentials, Motor - physiology
Female -
H-Reflex - physiology
Humans -
Male -
Motor Cortex - physiology
Muscle Contraction - physiology
Muscle Spindles - physiology
Muscle, Skeletal - physiology
Reflex, Stretch - physiology

Find related publications in this database (Keywords)
motor evoked potentials
reflex excitability
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