Premotor Reaction Time Changes as a Function of Initial Muscle Length and Movement Acceleration: A Research Note

Grabiner, Mark D.

doi:10.1080/02701367.1988.10605476

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…The electromechanical delay is aected by mechanical factors that change the rate of series elastic component shortening, such as the initial muscle length (Grabiner 1986;1988) and muscle loading (Ives et al 1993;Simmons and Richardson 1993). Fatiguing exercise lengthens the electromechanical delay (Zhou 1996).…”

Section: Introductionmentioning

confidence: 99%

Effects of repetitive dynamic contractions upon electromechanical delay

Gabriel

Boucher

1998

European Journal of Applied Physiology

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The effect of repeated maximal effort isotonic contractions on electromechanical delay was studied. Over 4 days, 17 male subjects performed 400 rapid elbow flexion trials. The kinematics and surface electromyographic (EMG) activity of the biceps brachii of these subjects were recorded. The period from the onset of the EMG until the beginning of movement was defined as the electromechanical delay. The period from the beginning of movement until the end of the EMG was defined as the second component of the contraction. Over the 4 day period there was an increase in the speed of limb movement. The mean power frequency and the duration of the EMG during the electromechanical delay did not change, while the root-mean-square amplitude increased. The duration of the EMG during the second component of the contraction remained stable. The mean power frequency and the root-mean-square amplitude of the EMG during the second component of the contraction increased with the speed of limb movement. We conclude that the faster contractions were a result of changes in motor unit recruitment during the second component of the contraction, rather than in the electromechanical delay.

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Section: Introductionmentioning

confidence: 99%

Effects of repetitive dynamic contractions upon electromechanical delay

Gabriel

Boucher

1998

European Journal of Applied Physiology

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Influence of initial forearm position on premotor times (PMTs) of the biceps brachii during an elbow flexion task

Furubayashi¹,

Kasai²

1990

Human Movement Science

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Fractionated Premotor, Motor, and Ankle Dorsiflexion Reaction Times in Hemiplegia

et al. 1998

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Ten hemiplegic subjects completed 20 rapid dorsiflexions of their afflicted and nonafflicted limbs. Electrodes were attached to the tibialis anterior and the gastrocnemius muscles and electromyograms were recorded for their premotor time, motor time, and simple reaction time during ankle dorsiflexion and plantar flexion of their lower limbs. The fractionated components of reaction time, namely, premotor time and motor time, of both legs were statistically compared. It was found that the premotor time of the subject's stroke-affected limb was significantly slower than the premotor time of the nonaffected limb (control), with no differences between their associated mean motor times. These results supported the hypothesis that a stroke has a deleterious affect upon the central, premotor time processing centers and has no disruptive influence upon the peripheral motor time. Comparing the fractionated components of reaction time (premotor time and motor time), with simple reaction time, the former provided a more sensitive and valid method to detect possible injurious side effects of a stroke upon the brain's neuromotor transmission centers and subcenters, and their peripheral, stimulus, response network.

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Premotor Reaction Time Changes as a Function of Initial Muscle Length and Movement Acceleration: A Research Note

Cited by 3 publications

References 8 publications

Effects of repetitive dynamic contractions upon electromechanical delay

Effects of repetitive dynamic contractions upon electromechanical delay

Influence of initial forearm position on premotor times (PMTs) of the biceps brachii during an elbow flexion task

Fractionated Premotor, Motor, and Ankle Dorsiflexion Reaction Times in Hemiplegia

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