Organization of the motor-unit pool for different directions of isometric contraction of the first dorsal interosseous muscle.

Abstract:

INTRODUCTION:Muscle force generation involves recruitment and firing rate modulation of motor units (MUs). The control of MUs in producing multidirectional forces remains unclear. METHODS:We studied MU recruitment and firing properties, recorded from the first dorsal interosseous muscle, for 3 different directions of contraction: abduction; abduction/flexion combination; and flexion. RESULTS:MUs were recruited systematically at higher threshold force during flexion. Larger MUs were recruited and firing rates of MUs were lower during abduction. There was an orderly recruitment of MUs according to MU size regardless of contraction direction, obeying the "size principle." Firing rates of earlier-recruited MUs were consistently higher than later-recruited MUs, affirming the "onion-skin" property. DISCUSSION:Our findings suggest that the size principle and onion-skin organization together provide a general description of MU recruitment patterns and firing properties. The directional alternations of MU control properties likely reflect changes in neural drive to the muscle. Muscle Nerve 57: E85-E93, 2018.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Lei Y,Suresh NL,Rymer WZ,Hu X

doi

10.1002/mus.25963

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

E85-E93

issue

1

eissn

0148-639X

issn

1097-4598

journal_volume

57

pub_type

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