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• W2209314573 endingPage "276" @default.
• W2209314573 startingPage "265" @default.
• W2209314573 abstract "The purpose of the study was to quantify the effect of motor-unit synchronization on the spike-triggered average forces of a population of motor units. Muscle force was simulated by defining mechanical and activation characteristics of the motor units, specifying motor neuron discharge times, and imposing various levels of motor-unit synchronization. The model comprised 120 motor units. Simulations were performed for motor units 5-120 to compare the spike-triggered average responses in the presence and absence of motor-unit synchronization with the motor-unit twitch characteristics defined in the model. To synchronize motor-unit activity, selected motor-unit discharge times were adjusted; this kept the number of action potentials constant across the three levels of synchrony for each motor unit. Because there was some overlap of motor-unit twitches even at minimal discharge rates, the simulations indicated that spike-triggered averaging underestimates the twitch force of all motor units and the contraction time of motor units with contraction times longer than 49 ms. Although motor-unit synchronization increased the estimated twitch force and decreased the estimated contraction time of all motor units, spike-triggered average force changed systematically with the level of synchrony in motor units 59-120 (upper 90% of the range of twitch forces). However, the reduction in contraction time was similar for moderate and high synchrony. In conclusion, spike-triggered averaging appears to provide a biased estimate of the distribution of twitch properties for a population of motor units because twitch fusion causes an underestimation of twitch force for slow units and motor-unit synchronization causes an overestimation of force for fast motor units." @default.
• W2209314573 created "2016-06-24" @default.
• W2209314573 creator A5015886370 @default.
• W2209314573 creator A5050274704 @default.
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• W2209314573 date "2002-07-01" @default.
• W2209314573 modified "2023-10-15" @default.
• W2209314573 title "Motor-Unit Synchronization Alters Spike-Triggered Average Force in Simulated Contractions" @default.
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• W2209314573 doi "https://doi.org/10.1152/jn.2002.88.1.265" @default.
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