Changes in timing of muscle contractions and running economy with altered stride pattern during running

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Changes in timing of muscle contractions and running economy with altered stride pattern during running. / Connick, Mark J; Li, Francois-Xavier.

In: Gait and Posture, Vol. 39, No. 1, 2014, p. 634-7.

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@article{cf007715c7e94d4db89a30fcb82c01f7,
title = "Changes in timing of muscle contractions and running economy with altered stride pattern during running",
abstract = "Large alterations to the preferred running stride decrease running economy, and shorter strides increase leg muscle activity. However, the effect of altered strides on the timing of leg muscle activation is not known. The aim of this study was to evaluate the impact of moderate alterations to the running stride on running economy and the timing of biceps femoris (BF), vastus lateralis (VL) and gastrocnemius (GAST) muscle contractions. The preferred stride pattern for eleven trained male runners was measured prior to a separate visit where participants ran for bouts of 5 min whilst synchronising foot contacts to a metronome signal which was tuned to (1) the preferred stride, and (2) frequencies which related to ± 8% and ± 4% of the preferred stride length. Running economy was measured at each stride pattern along with electromyography and three-dimensional kinematics to estimate onset and offset of muscle contractions for each muscle. Running economy was greatest at the preferred stride length. However, a quadratic fit to the data was optimised at a stride which was 2.9% shorter than preferred. Onset and offset of BF and VL muscle contractions occurred earlier with shorter than preferred strides. We detected no changes to the timing of muscle contractions with longer than preferred strides and no changes to GAST muscle contractions. The results suggest that runners optimise running economy with a stride length that is close to, but shorter than, the preferred stride, and that timing of BF and VL muscle contractions change with shorter than preferred strides.",
keywords = "Adult, Biomechanical Phenomena, Electromyography, Gait, Humans, Male, Muscle Contraction, Muscle, Skeletal, Quadriceps Muscle, Running, Young Adult",
author = "Connick, {Mark J} and Francois-Xavier Li",
note = "Copyright {\textcopyright} 2013 Elsevier B.V. All rights reserved.",
year = "2014",
doi = "10.1016/j.gaitpost.2013.07.112",
language = "English",
volume = "39",
pages = "634--7",
journal = "Gait and Posture",
issn = "0966-6362",
publisher = "Elsevier",
number = "1",

}

RIS

TY - JOUR

T1 - Changes in timing of muscle contractions and running economy with altered stride pattern during running

AU - Connick, Mark J

AU - Li, Francois-Xavier

N1 - Copyright © 2013 Elsevier B.V. All rights reserved.

PY - 2014

Y1 - 2014

N2 - Large alterations to the preferred running stride decrease running economy, and shorter strides increase leg muscle activity. However, the effect of altered strides on the timing of leg muscle activation is not known. The aim of this study was to evaluate the impact of moderate alterations to the running stride on running economy and the timing of biceps femoris (BF), vastus lateralis (VL) and gastrocnemius (GAST) muscle contractions. The preferred stride pattern for eleven trained male runners was measured prior to a separate visit where participants ran for bouts of 5 min whilst synchronising foot contacts to a metronome signal which was tuned to (1) the preferred stride, and (2) frequencies which related to ± 8% and ± 4% of the preferred stride length. Running economy was measured at each stride pattern along with electromyography and three-dimensional kinematics to estimate onset and offset of muscle contractions for each muscle. Running economy was greatest at the preferred stride length. However, a quadratic fit to the data was optimised at a stride which was 2.9% shorter than preferred. Onset and offset of BF and VL muscle contractions occurred earlier with shorter than preferred strides. We detected no changes to the timing of muscle contractions with longer than preferred strides and no changes to GAST muscle contractions. The results suggest that runners optimise running economy with a stride length that is close to, but shorter than, the preferred stride, and that timing of BF and VL muscle contractions change with shorter than preferred strides.

AB - Large alterations to the preferred running stride decrease running economy, and shorter strides increase leg muscle activity. However, the effect of altered strides on the timing of leg muscle activation is not known. The aim of this study was to evaluate the impact of moderate alterations to the running stride on running economy and the timing of biceps femoris (BF), vastus lateralis (VL) and gastrocnemius (GAST) muscle contractions. The preferred stride pattern for eleven trained male runners was measured prior to a separate visit where participants ran for bouts of 5 min whilst synchronising foot contacts to a metronome signal which was tuned to (1) the preferred stride, and (2) frequencies which related to ± 8% and ± 4% of the preferred stride length. Running economy was measured at each stride pattern along with electromyography and three-dimensional kinematics to estimate onset and offset of muscle contractions for each muscle. Running economy was greatest at the preferred stride length. However, a quadratic fit to the data was optimised at a stride which was 2.9% shorter than preferred. Onset and offset of BF and VL muscle contractions occurred earlier with shorter than preferred strides. We detected no changes to the timing of muscle contractions with longer than preferred strides and no changes to GAST muscle contractions. The results suggest that runners optimise running economy with a stride length that is close to, but shorter than, the preferred stride, and that timing of BF and VL muscle contractions change with shorter than preferred strides.

KW - Adult

KW - Biomechanical Phenomena

KW - Electromyography

KW - Gait

KW - Humans

KW - Male

KW - Muscle Contraction

KW - Muscle, Skeletal

KW - Quadriceps Muscle

KW - Running

KW - Young Adult

U2 - 10.1016/j.gaitpost.2013.07.112

DO - 10.1016/j.gaitpost.2013.07.112

M3 - Article

C2 - 23948332

VL - 39

SP - 634

EP - 637

JO - Gait and Posture

JF - Gait and Posture

SN - 0966-6362

IS - 1

ER -