Faculty Collaboration Database

Spinal and supraspinal motor control predictors of rate of torque development. Scand J Med Sci Sports 2015 Oct;25(5):623-9

Date

07/22/2014

Pubmed ID

25039746

DOI

10.1111/sms.12283

Scopus ID

2-s2.0-84941743800 (requires institutional sign-in at Scopus site)   24 Citations

Abstract

During explosive movements and potentially injurious situations, the ability to rapidly generate torque is critical. Previous research has suggested that different phases of rate of torque development (RTD) are differentiately controlled. However, the extent to which supraspinal and spinal mechanisms predict RTD at different time intervals is unknown. RTD of the plantarflexors across various phases of contraction (i.e., 0-25, 0-50, 0-100, 0-150, 0-200, and 0-250 ms) was measured in 37 participants. The following predictor variables were also measured: (a) gain of the resting soleus H-reflex recruitment curve; (b) gain of the resting homonymous post-activation depression recruitment curve; (c) gain of the GABAergic presynaptic inhibition recruitment curve; (d) the level of postsynaptic recurrent inhibition at rest; (e) level of supraspinal drive assessed by measuring V waves; and (f) the gain of the resting soleus M wave. Stepwise regression analyses were used to determine which variables significantly predicted allometrically scaled RTD. The analyses indicated that supraspinal drive was the dominant predictor of RTD across all phases. Additionally, recurrent inhibition predicted RTD in all of the time intervals except 0-150 ms. These results demonstrate the importance of supraspinal drive and recurrent inhibition to RTD.

Author List

Johnson ST, Kipp K, Norcross MF, Hoffman MA

Author

Kristof Kipp BS,MS,PhD Assistant Professor in the Physical Therapy department at Marquette University

MESH terms used to index this publication - Major topics in bold

Adolescent
Adult
Brain
Electric Stimulation
Electromyography
Female
H-Reflex
Humans
Male
Motor Neurons
Muscle Contraction
Muscle, Skeletal
Neurons, Afferent
Spine
Time Factors
Torque
Young Adult
gamma-Aminobutyric Acid