Differential effects of stimulus characteristics during knee joint perturbation on hamstring and quadriceps reflex responses

Bruhn, Sven; Leukel, Christian; Gollhofer, Albert

doi:10.1016/j.humov.2011.07.015

Cited by 8 publications

(31 citation statements)

References 57 publications

(74 reference statements)

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“…experiments that measured anterior knee laxity while subjects were relaxed [31]–[33], should be viewed with caution. Furthermore, a study by Bruhn et al [23] has revealed that hamstring reflex responses are modulated according to the stimulus characteristics, i.e. stretch velocity vs. stimulus amplitude.…”

Section: Discussionmentioning

confidence: 99%

“…During the experiment, participants were examined with regard to reflex responses and TT before and after a fatiguing jumping task. The measurements were performed using a knee arthrometer [16], [21]–[23] (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

“…the beginning of EMG deflection (average EMG baseline value measured over 100 ms ± 3 standard deviations). Muscle activity was analyzed according to Bruhn et al [23], that is, the TT signal indicated the onset of perturbation and muscle activity was calculated over different time intervals relative to the onset of TT, i.e. 20–40, 40–60 and 60–95 ms (Fig.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Fatigue on Hamstring Reflex Responses and Posterior-Anterior Tibial Translation in Men and Women

et al. 2013

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Anterior cruciate ligament (ACL) rupture ranks among the most common injuries in sports. The incidence of ACL injuries is considerably higher in females than in males and the underlying mechanisms are still under debate. Furthermore, it has been suggested that muscle fatigue can be a risk factor for ACL injuries.We investigated gender differences in hamstring reflex responses and posterior-anterior tibial translation (TT) before and after fatiguing exercise. We assessed the isolated movement of the tibia relative to the femur in the sagittal plane as a consequence of mechanically induced TT in standing subjects. The muscle activity of the hamstrings was evaluated. Furthermore, isometric maximum voluntary torque (iMVT) and rate of torque development (RTD) of the hamstrings (H) and quadriceps (Q) were measured and the MVT H/Q as well as the RTD H/Q ratios were calculated.After fatigue, reflex onset latencies were enhanced in women. A reduction of reflex responses associated with an increased TT was observed in females. Men showed no differences in these parameters. Correlation analysis revealed no significant associations between parameters for TT and MVT H/Q as well as RTD H/Q.The results of the present study revealed that the fatigue protocol used in this study altered the latency and magnitude of reflex responses of the hamstrings as well as TT in women. These changes were not found in men. Based on our results, it is conceivable that the fatigue-induced decrease in neuromuscular function with a corresponding increase in TT probably contributes to the higher incidence of ACL injuries in women.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of Fatigue on Hamstring Reflex Responses and Posterior-Anterior Tibial Translation in Men and Women

et al. 2013

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“…The EMG onset latencies were defined as the time between onset of TT and onset of significant muscular activity, e.g., the beginning of EMG deflection (average EMG baseline value measured over 100 ms ± 3 standard deviations). Muscle activity was analyzed as described previously . Briefly, the deflection of the TT signal indicated the onset of perturbation and muscle activity was calculated over different time intervals relative to the onset of TT, i.e., 20–40, 40–60, and 60–95 ms using the root mean square of the EMG signal (RMS‐EMG).…”

Section: Methodsmentioning

confidence: 99%

“…1). 2,4,12,24 Measurement of Posterior-Anterior Tibial Translation Participants were examined in bipedal stance with the knees in 30˚flexion (0˚¼ full extension). In order to standardize the stance position between the trials, subjects stood on a force plate (sampling frequency: 40 Hz, GKS 1000 1 , IMM Holding GmbH, Mittweida, Germany).…”

Section: Subjects and Study Designmentioning

confidence: 99%

Repetitive jumping and sprinting until exhaustion alters hamstring reflex responses and tibial translation in males and females

Behrens

Mau-Moeller²,

Wassermann

et al. 2015

Journal Orthopaedic Research

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The incidence of anterior cruciate ligament injuries is considerably higher in females than in males and the underlying mechanisms are still under debate. Research indicates that the neuromuscular system of females and males might respond differently to the same fatigue protocol due to differences in muscle activation during movement tasks. This study analyzed sex differences in hamstring reflex responses and posterior-anterior tibial translation (TT) before and after fatiguing exercise. We measured the isolated movement of the tibia relative to the femur as a consequence of mechanically induced TT in standing subjects as well as muscle activity of the hamstrings before and after repetitive jumping and sprinting until exhaustion. Muscle fatigue delayed reflex onset latencies in females and males. A reduction in reflex responses associated with an increased TT was observed after fatiguing exercise for both sexes. Data indicate that the used fatigue protocol altered the latency and magnitude of reflex responses as well as TT in females and males. Based on the results of previous research and the outcome of this study, it might be that sex-specific effects of fatigue on reflex activity and mechanical stability of the knee depend on the kind of fatiguing exercise.

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Bilateral neuromuscular control in patients one year after unilateral ACL rupture or reconstruction. A cross-sectional study

Blasimann,

Busch,

Henle

et al. 2024

Heliyon

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Differential effects of stimulus characteristics during knee joint perturbation on hamstring and quadriceps reflex responses

Cited by 8 publications

References 57 publications

Effect of Fatigue on Hamstring Reflex Responses and Posterior-Anterior Tibial Translation in Men and Women

Effect of Fatigue on Hamstring Reflex Responses and Posterior-Anterior Tibial Translation in Men and Women

Repetitive jumping and sprinting until exhaustion alters hamstring reflex responses and tibial translation in males and females

Bilateral neuromuscular control in patients one year after unilateral ACL rupture or reconstruction. A cross-sectional study

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