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- W2019423968 abstract "Modulation of soleus H-reflex magnitudes during pedalling, and their approximation when seated with appropriate joint positions and contractile activity was demonstrated in the previous paper. The present study investigated the modulation of H-reflexes during (A) pedalling movement in the absence of contractile activity, (B) different movement velocities and (C) movement of a single limb. Using a customized tandem cycle ergometer, seated subjects with trunk supported relaxed their leg muscles and allowed their legs to be rotated. Their feet were supported on the pedals with the ankle braced. Reflexes were collected at four phases in the movement cycle (with some at 13 phases) and with speeds of 5–60 revolutions per min (cycle times from 12 to 1 s). The results showed that (i) reflex magnitude substantially decreased with limb rotation(P < 0.05). The degree of inhibition was dependent on the phase position. (ii) Increasing speed of passive rotation increased the inhibition at all positions, but was most pronounced near the fullest flexion of hip and knee. When subjects actively pedalled, the relationship between speed and inhibition remained. (iii) When the contralateral leg was moved and the target leg was stationary, crossed projection of reflex inhibition was clear. (iv) The reflex gain measured during active pedalling of one leg was similar to that observed during two legged pedalling. Again, a crossed effect from the contralateral leg could be observed. We conclude that the net influence of discharge from movement-elicited afference is inhibitory on this reflex path and that the reflex modulation during pedalling arises from overlaid sources. From the two papers in this present set of studies, we suggest that tonic inhibition over the whole movement cycle is relieved by overlaid reflex excitation during active pedalling, particularly during the phase when the leg extends. Each component, inhibition and excitation, is multisourced with overlap of effects from peripheral discharge." @default.
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- W2019423968 date "1992-06-01" @default.
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- W2019423968 title "Movement features and H-reflex modulation. II. Passive rotation, movement velocity and single leg movement" @default.
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- W2019423968 doi "https://doi.org/10.1016/0006-8993(92)90320-9" @default.
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