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Influence of Lumbar Mobilizations During the Nordic Hamstring Exercise on Hamstring Measures of Knee Flexor Strength, Failure Point, and Muscle Activity: A Randomized Crossover Trial

Chesterton, Paul, Evans, Will, Wright, Matthew, Richardson, Mark, Loli, Lorenzo and Atkinson, Greg (2021) Influence of Lumbar Mobilizations During the Nordic Hamstring Exercise on Hamstring Measures of Knee Flexor Strength, Failure Point, and Muscle Activity: A Randomized Crossover Trial. Journal of Manipulative and Physiological Therapeutics. ISSN 0161-4754

Item Type: Article

Abstract

Objective: The aims of this study were to quantify the effects of unilateral posterior-anterior mobilization on force production, failure point and muscle activity of the hamstrings during the Nordic hamstring exercise (NHE) and explore individual differences in responses.
Methods: In a replicated randomized crossover trial, twenty-four participants (age [mean ± SD]: 27 ± 6 y, body mass: 82 ± 17 kg, stature: 181 ± 8 cm) completed two standardized intervention (L4/5 zygapophyseal mobilizations) and two control conditions. The failure point of the Nordic hamstring exercise was determined with 3D motion capture. Peak force, knee flexor torque and electromyography (EMG) of the Biceps Femoris were measured. Data analyses were undertaken to quantify mean intervention response and explore any individual response heterogeneity.
Results: Mean (95% confidence interval) left limb force was higher in intervention vs control by 18.7 (4.6–32) N. Similarly, right limb force was higher by 22.0 (3.4–40.6) N, left peak torque by 0.14 (0.06–0.22) Nm and right peak torque by 0.14 (0.05–0.23) Nm/Kg. Downward Force (DWF) angle was decreased in intervention vs control by 4.1° (0.5–7.6) on the side of application. Both peak EMG activity (p=.002), and EMG at the DWF (Right) (p= .020) increased in the intervention condition by 16.8 (7.1–26.4) and 8.8 (1.5–16.1) (mV), respectively. Mean downward acceleration angle changed by only 0.3° (-8.9–9.4) in intervention vs control. A clear response heterogeneity was indicated only for force right (participant x intervention interaction: P=.044; Response heterogeneity SD = 34.5 (5.7–48.4) N). Individual response heterogeneity was small for all other outcomes.
Conclusions: Following UPA mobilization, immediate changes in bilateral hamstring force production and peak torque occurred during the NHE. The effect on the NHE failure point was unclear. EMG activity increased on the ipsilateral side. Response heterogeneity was generally similar to the random trial-to-trial variability inherent in the measurement of the outcomes.

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More Information

Depositing User: Will Evans

Identifiers

Item ID: 12548
Identification Number: https://doi.org/10.1016/j.jmpt.2020.09.005
ISSN: 0161-4754
URI: http://sure.sunderland.ac.uk/id/eprint/12548
Official URL: https://www.sciencedirect.com/science/article/pii/...

Users with ORCIDS

ORCID for Paul Chesterton: ORCID iD orcid.org/0000-0002-9432-0675
ORCID for Will Evans: ORCID iD orcid.org/0000-0003-2111-5408

Catalogue record

Date Deposited: 14 Sep 2020 13:32
Last Modified: 10 Sep 2021 02:38

Contributors

Author: Paul Chesterton ORCID iD
Author: Will Evans ORCID iD
Author: Matthew Wright
Author: Mark Richardson
Author: Lorenzo Loli
Author: Greg Atkinson

University Divisions

Faculty of Health Sciences and Wellbeing > School of Nursing and Health Sciences > Department of Sport and Excercise Sciences

Subjects

Sciences > Health Sciences
Sciences > Sport Sciences

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