Modulation of premovement H-reflex facilitation during step and ramp movements under reaction time and self-paced conditions

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Bibliographic Details
Title translated into German:Schwankungen in der bewegungsvorbereitenden H-Reflex-Aktivierung bei koerperlichen Belastungen von stufenfoermig oder gleichmaessig ansteigender Intensitaet unter fremd- oder selbstgesteuerten Bedingungen
Author:Kawai, Kazutake; Komiyama, Tomoyoshi; Furubayashi, Toshiaki
Published in:Japanese journal of physical fitness and sports medicine
Published:43 (1994), 5 , S. 352-360, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
Online Access:
Identification number:PU199504100917

Author's abstract

Premovement facilitation of spinal monosynaptic reflex was investigated under different movement modalities using both visually guided tracking movement and the H-reflex technique. Subjects performed fast step and slow ramp movements under reaction time (RT) conditions and self time determining (Self) conditions. For each of the conditions, the motor task was bilateral simultaneous dorsiflexion. Under both RT and Self conditions, the onset of premovement H-reflex facilitation (OPHF) was significantly prolonged in the slow ramp movement (RT, 24.4+/-6.2 ms; Self, 43.4+/-14.2 ms). In addition, OPHF was significantly prolonged under Self conditions in both the step and ramp movements. Movement time (MT) did not differ significantly under RT and Self conditions except in three subjects. The peak value of torque change (PV) was larger under Self conditions than under RT conditions in four out of ten subjects. From these results, we conclude that OPHF is modulated not only by changes in movement modality. It is suggested that this contextual dependency of OPHF might be controlled by the supraspinal motor center. Verf.-Referat