Effect of localized muscle fatigue on vertical ground reaction forces and ankle joint motion during running

Christina, Kathryn A; White, Scott C.; Gilchrist, Louise

doi:10.1016/s0167-9457(01)00048-3

Cited by 165 publications

(154 citation statements)

References 24 publications

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“…Reduced pushoff force of the stance leg reduces the transitional acceleration of the whole body COM and increases RCOF and risk of slip initiation [8]. The knee joint moment in the F session are contradictory to some studies in the past [26,27]. The discrepancies may be attributed to variation in fatigue patterns (i.e., general lower extremity fatigue, dorsiflexor fatigue) in the previous studies.…”

Section: Discussionmentioning

confidence: 89%

Effects of quadriceps fatigue on the biomechanics of gait and slip propensity

2008

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This study examines how lower extremity fatigue of the quadriceps alters gait variables related to slip propensity. Sixteen healthy young adults were recruited to walk across vinyl floor surfaces in states of fatigue and no fatigue. Kinematic and kinetic data were collected using a three-dimensional motion analysis system and force plates. The results indicated a significant increase in both the heel contact velocity and required coefficient of friction and a decrease in the transitional acceleration of the whole body center of mass and peak knee joint moment in the fatigue trials. Thus, suggesting that slip propensity could increase with fatigue. Additionally, there was increased knee flexion and reduced ankle dorsiflexion at the heel contact phase of the gait cycle during fatigue trials. These findings provide new insights into the biomechanical relationship between localized muscle fatigue and gait parameters associated with slip propensity. The present study concluded that localized muscle fatigue affects gait parameters and hence can be considered as a potential risk factor for slipinduced falls.

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Section: Discussionmentioning

confidence: 89%

Effects of quadriceps fatigue on the biomechanics of gait and slip propensity

2008

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“…TA fatigue influences the loading rate of the vertical GRF in steady-state running [30,31]. An increased loading rate is also one of the typical characteristics of the last steps before the (WRT) in a protocol with gradually increasing speed [4].…”

Section: Wrtmentioning

confidence: 99%

Influence of M. tibialis anterior fatigue on the walk-to-run and run-to-walk transition in non-steady state locomotion

et al. 2007

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The purpose of this study was to examine the influence of muscular fatigue of tibialis anterior (TA) on the walk-to-run transition (WRT) and run-to-walk transition (RWT) when speed is altered at different constant accelerations (a = 0.01, 0.07 and 0.05 m s À2 ). Twenty women (height: 168.9 AE 3.36 cm) performed WRTs and RWTs on a motor-driven treadmill, before and after a protocol inducing muscular fatigue of the TA.WRT-speed decreased after TA fatigue whereas RWT-speed did not change except during the intermediate deceleration. Integrated EMG (iEMG) of the activity burst of TA around heel contact was examined in the last steps before transition, the transition step and the first steps after transition. iEMG increased before WRT, then decreased after transition to running. In the RWT the opposite was observed: iEMG increased after RWT, then decreased with decreasing walking speed. After inducing fatigue in the TA, there was a decrease in iEMG in the WRT whereas no influence of fatigue was found on iEMG in the RWT.As a result of TA fatigue, WRT occurred at a lower speed, probably to avoid over-exertion of the TA. This indicates that the TA is a likely determinant of WRT as previously reported. The RWT, on the other hand, was not altered following TA fatigue, which would indicate that WRT and RWT are determined by different factors. #

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“…For this reason, the biomechanics of fatigued running have been thoroughly investigated. [10][11][12][13][14][15][16][17][18] The effects of fatigue on impact loading during running have been inconclusive, with some authors 10 reporting that fatigue increases impact forces and others 11,12 finding the opposite. However, exhaustive running is known to alter running cadence, step length, and lower extremity joint kinematics.…”

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confidence: 99%

Muscle Coactivation Before and After the Impact Phase of Running Following Isokinetic Fatigue

Kellis

Zafeiridis

Amiridis

2011

Journal of Athletic Training

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Context: The effects of fatigue on impact loading during running are unclear, with some authors reporting increased impact forces and others reporting decreased forces.Objective: To examine the effects of isokinetic fatigue on muscle cocontraction ratios about the knee and ankle during running.Design: Cross-sectional study. Setting: Neuromechanics laboratory.Patients or Other Participants: Female middle-distance runners (age 5 21.3 6 1.93 years) with at least 5 years of training experience.Intervention(s): Participants ran on the treadmill at 3.61 m/s before and immediately after the fatigue protocol, which consisted of consecutive, concentric knee extension-flexion at 1206/s until they could no longer produce 30% of the maximum knee-extension moment achieved in the familiarization session for 3 consecutive repetitions.Main Outcome Measure(s): Electromyographic (EMG) amplitude of the vastus medialis (VM), biceps femoris (BF), gastrocnemius (GAS), and tibialis anterior (TA) was recorded using surface electrodes. Agonist:antagonist EMG ratios for the knee (VM:BF) and ankle (GAS:TA) were calculated for the preactivation (PR), initial loading response (LR 1 ), and late loading response (LR 2 ) phases of running. Hip-, knee-, and ankle-joint angular displacements at initial foot contact were obtained from 3-dimensional kinematic tracings.Results: Fatigue did not alter the VM:BF EMG ratio during the PR phase (P . .05), but it increased the ratio during the LR 1 phase (P , .05). The GAS:TA EMG ratio increased during the LR 1 phase after fatigue (P , .05) but remained unchanged during the PR and LR 2 phrases (P . .05).Conclusions: The increased agonist EMG activation, coupled with reduced antagonist EMG activation after impact, indicates that the acute decrease in muscle strength capacity of the knee extensors and flexors results in altered muscleactivation patterns about the knee and ankle before and after foot impact.Key Words: biomechanics, muscle fatigue, joint stability Key PointsN After an isokinetic fatigue protocol for the knee-extensor and knee-flexor muscles, participants contacted the ground with a greater knee-flexion angle.N An antagonist inhibition strategy about the knee and ankle was noted, as was a quadriceps-dominant strategy during the preactivation and initial contact phases of running.

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Effect of localized muscle fatigue on vertical ground reaction forces and ankle joint motion during running

Cited by 165 publications

References 24 publications

Effects of quadriceps fatigue on the biomechanics of gait and slip propensity

Effects of quadriceps fatigue on the biomechanics of gait and slip propensity

Influence of M. tibialis anterior fatigue on the walk-to-run and run-to-walk transition in non-steady state locomotion

Muscle Coactivation Before and After the Impact Phase of Running Following Isokinetic Fatigue

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