Lectures and Symposia Peer-Reviewed Abstracts

James, Roger; Dufek, Janet S.; Bates, Barry T.

doi:10.1080/02701367.2006.10599346

Cited by 5 publications

(2 citation statements)

References 42 publications

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“…To be consistent with the landing mode under a prefatigue condition, appropriate control of the landing posture is required as a protective behavior in terms of maintaining the impact force and LR [30]. However, James et al also found a greater peak GRF/LR during a DL task using the fatigue protocol of stretch shortening cycle exercise [18]. Therefore, whether the characteristics of the GRF/LR would change with the development of fatigue still needs further investigation.…”

Section: Discussionmentioning

confidence: 99%

“…However, previous studies on the effects of fatigue during landing activities have demonstrated different responses in ground reaction force (GRF) characteristics [16–19]. Smith et al and Kellis and Kouveliod found a decrease in peak GRF under fatigued conditions during DL [16, 17], but no differences were observed in peak GRF between nonfatigued and fatigued conditions during the same landing task [18, 19]. The causes of these different responses are multifactorial.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Two Fatigue Protocols on Impact Forces and Lower Extremity Kinematics during Drop Landings: Implications for Noncontact Anterior Cruciate Ligament Injury

Xia

Zhang

Wang

et al. 2017

Journal of Healthcare Engineering

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The purpose of the study was to determine the effects of fatigue on the impact forces and sagittal plane kinematics of the lower extremities in a drop landing task. 15 male collegiate athletes were recruited. Five successful trials of a drop landing task were obtained during prefatigue and postfatigue in two fatigue protocols (constant speed running fatigue protocol [R-FP] and shuttle running + vertical jumping fatigue protocol [SV-FP]). Duration time, maximal heart rate, and RPE of each protocol were measured separately. Kinematic measures of the hip, knee, and ankle joints at different times coupled with peak impact force and loading rate were acquired. Our results showed a more flexed landing posture due to an increase in hip and knee flexion angles in the postfatigue condition. However, no differences in peak impact force and loading rate were found between pre- and postfatigue conditions. The changes were similar between protocols, but the SV-FP showed a significantly shorter exercise duration time than the R-FP. Fatigued athletes in this study demonstrated altered motor control strategies during a drop landing task, which may be an intentional or unintentional protective strategy for preventing themselves from potential ACL injury.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Two Fatigue Protocols on Impact Forces and Lower Extremity Kinematics during Drop Landings: Implications for Noncontact Anterior Cruciate Ligament Injury

Xia

Zhang

Wang

et al. 2017

Journal of Healthcare Engineering

View full text Add to dashboard Cite

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Impact Attenuation and Variability during Running in Females: A Lifespan Investigation

Dufek¹,

Mercer²,

Teramoto³

et al. 2008

Journal of Sport Rehabilitation

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The effect of force sensation on the ability to control muscle force during fatigue condition

Kiyama

Kawada

Tokunaga

et al. 2014

IES

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BACKGROUND AND OBJECTIVE: Proprioceptive information from muscle receptors is important in force control and disturbed sensation due to fatigue may reduce the precision of force control. The aim of this study was to clarify the relationship between force sensation and force control ability in knee extensor muscles during fatigue. METHODS: Eighteen healthy young volunteers participated in this study. Force matching tasks with and without feedback were performed immediately before and after the fatigue protocol consisting of 20 s isometric contractions. The target force was 10% and 30% of the maximal voluntary contraction force in the pre-fatigue protocol. The accuracy of force control ability was estimated by the root mean square error (RMS error) and average difference (average error) between the target and output force. Surface electromyograms were recorded simultaneously from the quadriceps. RESULTS: In the 30% task, there was a significant interaction effect of fatigue and feedback condition in RMS error and average error. RMS error and average error were degenerated significantly by fatigue in the feedback removal condition, but not in the feedback condition. Though the activation of quadriceps was increased by fatigue, increase of muscle activation was lower in the feedback removal condition than that in the feedback conditions. CONCLUSION: Since participants controlled their force output depending on the force sensation in the feedback removal condition, these results indicate that the decline in force sensation may be a significant factor in the decreases of accuracy in force output during fatigue.

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Lectures and Symposia Peer-Reviewed Abstracts

Cited by 5 publications

References 42 publications

Effects of Two Fatigue Protocols on Impact Forces and Lower Extremity Kinematics during Drop Landings: Implications for Noncontact Anterior Cruciate Ligament Injury

Effects of Two Fatigue Protocols on Impact Forces and Lower Extremity Kinematics during Drop Landings: Implications for Noncontact Anterior Cruciate Ligament Injury

Impact Attenuation and Variability during Running in Females: A Lifespan Investigation

The effect of force sensation on the ability to control muscle force during fatigue condition

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