Knee joint neuromuscular activation performance during muscle damage and superimposed fatigue

Minshull, Claire; Eston, Roger G.; Rees, David; Gleeson, Nigel

doi:10.1080/02640414.2012.682084

Cited by 11 publications

(11 citation statements)

References 39 publications

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“…The increased EMD is similar to the findings of previous studies that also showed fatigue‐inducing increases in EMD for leg extensors, leg flexors, adductor pollicis, plantar flexors, and biceps brachii muscles. Because EMD is a function of both the structural components of the muscle–tendon unit (i.e., SEC, tendon properties) and muscle membrane action potential propagation and EC‐C, the fatigue‐inducing increases in EMD we observed may be a consequence of alterations or impairments in these physiological mechanisms. For example, Toumi et al .…”

Section: Discussionmentioning

confidence: 90%

“…suggested that neuromuscular fatigue may elicit an increased injury risk due to inability of the muscles to contract properly to stabilize the knee joint during critical periods of mechanical loading. Because leg extensors and flexors are both critically important for sport performance and for knee stabilization to prevent anterior cruciate ligament and other lower extremity injuries, numerous research studies have focused on examining the effects of fatigue on EMD of leg extensor and flexor muscle groups . However, aside from Conchola et al ., who assessed voluntary fatigue on EMD for both the leg extensors and flexors in young and elderly men, previous studies have only assessed EMD for either the extensors or flexors .…”

mentioning

confidence: 99%

“…Because leg extensors and flexors are both critically important for sport performance and for knee stabilization to prevent anterior cruciate ligament and other lower extremity injuries, numerous research studies have focused on examining the effects of fatigue on EMD of leg extensor and flexor muscle groups. 2,3,6,16,17,19 However, aside from Conchola et al, 6 who assessed voluntary fatigue on EMD for both the leg extensors and flexors in young and elderly men, previous studies have only assessed EMD for either the extensors 9,16,20 or flexors. 2,3,17 Moreover, although Conchola et al 6 observed different recovery patterns between muscles, further research is warranted as to whether differences in the time-course effects of fatigue on EMD exist between these large locomotor muscles.…”

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confidence: 99%

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Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women

et al. 2015

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confidence: 90%

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Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women

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“…We believe that one of the reasons for this finding is the type of exercise performed. Previous studies have indicated that highintensity contractions induced fatigue and alterations in EMD [15,16,18,34]. However, downhill running involvesthe stretch-shortening cycle and was based on moderate volumes of low-intensity eccentric contractions of the KE.…”

Section: Discussionmentioning

confidence: 99%

“…It has been suggested that both fatigue and exerciseinduced muscle damage lengthen EMD [15][16][17][18]. In fact, Conchola et al [17] showed that fatigue induced by intermittent isometric contractions lengthened both the KF and KE EMD.…”

Section: Introductionmentioning

confidence: 99%

Moderate intensity and volume downhill run does not impair knee joint stability at early and late phases of quadriceps/hamstrings contraction

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et al. 2014

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BACKGROUND AND OBJECTIVE: Muscle strength imbalance can be an important factor in hamstrings muscle strain. The main purpose of this study was to investigate the effects of downhill running on hamstrings/quadriceps torque (H/Qtorque) and the electromechanical delay (H/QEMD) ratios. METHODS: Fifteen active male individuals performed two maximal voluntary isometric contractions of the knee extensors and knee flexors, from which the maximal muscle torque, EMD and H/Qtorque and H/QEMD ratios were extracted. Thereafter, the participants performed a 30-minute downhill run (−16%) at 70% VO2max. Dependent variables were assessed immediately before, immediately following and 48 hours after the effort. RESULTS: Maximal isometric torque decreased significantly immediately after the downhill run for both the extensors (pre: 271.8 ± 45.9 N·m; post: 235.5 ± 55.7 N·m) and flexors (pre: 112.2 ± 26.3 N·m; post: 97.7 ± 27.2 N·m). No significant difference was identified over time for the EMD of the vastus lateralis and biceps femoris muscles. The H/Qtorque and H/QEMD ratios were not influenced by the downhill run. CONCLUSION: We have demonstrated that moderate intensity and volume downhill run does not impair knee joint stability at early (H/QEMD) and late phases (H/Qtorque) of quadriceps/hamstrings contraction.

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A Systematic Review of the Role of Vitamin D on Neuromuscular Remodelling Following Exercise and Injury

et al. 2015

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to systematically review the available evidence of the role of vitamin D on neuromuscular remodelling following exercise conditioning, exercise- or experimentally induced injury. We searched Medline (OVID platform), PubMed, Embase and Web of Science for randomised controlled trials (RCTs) including measures of neuromuscular function, injury and/or inflammation; a physiologically stressful intervention involving exercise conditioning, exercise- or experimentally induced injury and; vitamin D supplementation. Nine RCTs met the inclusion criteria. Significant heterogeneity of methodological approaches and outcomes meant that meta-analysis of data was limited. Qualitative findings indicated that vitamin D may be an effective accelerant of neuromuscular remodelling in animal models (24-140 % improved recovery vs. control); the effects in humans are inconclusive and likely influenced by baseline vitamin D and supplementation strategy. Results of the meta-analyses indicated no effect of vitamin D supplementation on muscle strength adaptation following resistance training [standardised mean difference (SMD): 0.74, P = 0.42] or muscle damage (SMD: -0.03, P = 0.92), although inflammatory markers were elevated in the latter (SMD: 0.56, P = 0.04). Data from animal models offer promising and plausible mechanisms for vitamin D as an agent for neuromuscular adaptation. Further high-quality research is needed to offer clearer insight into the influential role of vitamin D in human populations.

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Knee joint neuromuscular activation performance during muscle damage and superimposed fatigue

Cited by 11 publications

References 39 publications

Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women

Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women

Moderate intensity and volume downhill run does not impair knee joint stability at early and late phases of quadriceps/hamstrings contraction

A Systematic Review of the Role of Vitamin D on Neuromuscular Remodelling Following Exercise and Injury

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