Trunk Angle Modulates Feedforward and Feedback Control during Single-Limb Squatting

Kristin A. Johnson; Shojiro Nozu; Richard K. Shields

doi:10.3390/jfmk6040082

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Trunk Angle Modulates Feedforward and Feedback Control during Single-Limb Squatting

Kristin A. Johnson, Shojiro Nozu and Richard K. Shields

Journal of functional morphology and kinesiology, Vol.6(4), p.82

10/07/2021

DOI: 10.3390/jfmk6040082

PMCID: PMC8544525

PMID: 34698186

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Abstract

Trunk positioning and unexpected perturbations are high-risk conditions at the time of anterior cruciate ligament injury. The influence of trunk positioning on motor control responses to perturbation during dynamic performance is not known. We tested the influence of trunk position on feedforward and feedback control during unexpected perturbations while performing a novel single-limb squatting task. We also assessed the degree that feedforward control was predictive of feedback responses. In the flexed trunk condition, there were increased quadriceps (p < 0.026) and gluteus medius long-latency reflexes (p < 0.001) and greater quadriceps-to-hamstrings co-contraction during feedforward (p = 0.017) and feedback (p = 0.007) time bins. Soleus long-latency reflexes increased more than 100% from feedforward muscle activity regardless of trunk condition. Feedforward muscle activity differentially predicted long-latency reflex responses depending on the muscle (R2: 0.47–0.97). These findings support the concept that trunk positioning influences motor control responses to perturbation and that feedback responses may be invariant to the feedforward control strategy.

Details

Title: Subtitle: Trunk Angle Modulates Feedforward and Feedback Control during Single-Limb Squatting
Creators: Kristin A. Johnson - Roy J. and Lucille A. Carver College of Medicine
Shojiro Nozu - Juntendo University
Richard K. Shields - Roy J. and Lucille A. Carver College of Medicine
Resource Type: Journal article
Publication Details: Journal of functional morphology and kinesiology, Vol.6(4), p.82
DOI: 10.3390/jfmk6040082
PMID: 34698186
PMCID: PMC8544525
NLM abbreviation: J Funct Morphol Kinesiol
ISSN: 2411-5142
eISSN: 2411-5142
Grant note: DOI: 10.13039/100000002, name: National Institutes of Health, award: 5R01-HD082109-03, 5R01-HD084645-12; DOI: 10.13039/100009713, name: Foundation for Physical Therapy, award: Promotion of Doctoral Studies I Scholarship
Language: English
Date published: 10/07/2021
Academic Unit: Orthopedics and Rehabilitation; Physical Therapy and Rehabilitation Science; Injury Prevention Research Center
Record Identifier: 9984295054702771

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