TY  - JOUR
AU  - Kawai, Kazutake
A2  - Kawai, Kazutake
A2  - Komiyama, Tomoyoshi
A2  - Furubayashi, Toshiaki
DB  - BISp
DP  - BISp
KW  - Bewegungsfrequenz
KW  - Erregbarkeit, neuromuskuläre
KW  - H-Reflex
KW  - Nervensystem
KW  - Neurophysiologie
KW  - Reaktionszeit
KW  - Sportmedizin
LA  - jpn
TI  - Modulation of premovement H-reflex facilitation during step and ramp movements under reaction time and self-paced conditions
TT  - Schwankungen in der bewegungsvorbereitenden H-Reflex-Aktivierung bei koerperlichen Belastungen von stufenfoermig oder gleichmaessig ansteigender Intensitaet unter fremd- oder selbstgesteuerten Bedingungen
PY  - 1994
N2  - 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
SP  - S. 352-360
SN  - 0039-906X
JO  - Japanese journal of physical fitness and sports medicine
IS  - 5
VL  - 43
M3  - Gedruckte Ressource
ID  - PU199504100917
ER  -