Accession Number:

ADA167154

Title:

Electro-Mechanical Response Times and Rate of Force Development in Males and Females,

Descriptive Note:

Corporate Author:

DEFENCE AND CIVIL INST OF ENVIRONMENTAL MEDICINE DOWNSVIEW (ONTARIO)

Personal Author(s):

Report Date:

1986-01-01

Pagination or Media Count:

6.0

Abstract:

Muscle force development is influenced by both central pre-motor end plate and peripheral post-motor end plate components. Conflicting results are available concerning gender-related differences in the central component. This study compared males and females with regard to the following electro-mechanical response variables total reaction time, pre-motor time, electro-mechanical delay, and the rate of force development durig a maximal voluntary isometric contraction MVC of the elbow flexors. Forty-six males and 40 females performed MVCs against a bar attached to a force transducer. Subjects were instructed to attempt to flex the elbow with maximal force as rapidly as possible after perceiving a visual stimulus. Surface electromyographic activity was recorded from the biceps brachii and was sampled simultaneously with the force transducer data at 2 kHz and stored digitally. For data analyses the subjects were separated into four groups based on the force generated during the MVC weak females, weak males, strong females, and strong males. Neither total reaction time nor pre-motor time was significantly different across groups. The electro- mechanical delay for both male groups was significantly shorter than for both female groups. Electro-mechanical delay was weakly, but significantly, correlated with rate of force development and maximum force. Reprints

Subject Categories:

  • Psychology
  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE