2015
DOI: 10.1002/mus.24598
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Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women

Abstract: No differential gender-related fatigue effects on EMD were shown. There were different fatigue-induced responses between leg extensors and flexors, with leg extensors exhibiting higher EMD immediately post-fatigue.

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Cited by 18 publications
(15 citation statements)
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“…In this regard, short EMD reflects fast force transmission from the musculotendinous unit to the bone (Ricci Hannah et al, 2012). In general, longer EMD of hamstring muscles suggests impaired neuromuscular control which again affects knee joint stability (Hannah et al, 2014; Conchola et al, 2015). More specifically, there is evidence that short EMD of the hamstring muscles is crucial to protect the ACL from any excessive mechanical overload by providing stability to the tibia and by mitigating anterior tibia translation (Yanagawa et al, 2002; Hannah et al, 2014).…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…In this regard, short EMD reflects fast force transmission from the musculotendinous unit to the bone (Ricci Hannah et al, 2012). In general, longer EMD of hamstring muscles suggests impaired neuromuscular control which again affects knee joint stability (Hannah et al, 2014; Conchola et al, 2015). More specifically, there is evidence that short EMD of the hamstring muscles is crucial to protect the ACL from any excessive mechanical overload by providing stability to the tibia and by mitigating anterior tibia translation (Yanagawa et al, 2002; Hannah et al, 2014).…”
Section: Discussionmentioning
confidence: 99%
“…Given the above, this study aimed at examining the effects of neuromuscular fatigue on knee flexor EMD during the performance of eccentric muscle actions in healthy young adults according to their training status (i.e., athletes vs. physically active vs. sedentary). Based on previous literature (Conchola et al, 2015; De Ste Croix et al, 2015b; Bachasson et al, 2016), we hypothesized that neuromuscular fatigue induces longer knee flexor EMDs, particularly in individuals with low training status (Mitchell et al, 2011). Findings from this study could be clinically relevant for monitoring injury risk and for the implementation of injury preventive programs (Ristanis et al, 2009; Hannah et al, 2014; Flevas et al, 2017).…”
Section: Introductionmentioning
confidence: 99%
“…The knee‐extensors and knee‐flexors MVC was used to individually tailor the fatiguing protocol. This consisted of a duty‐cycle of 6 s isometric knee extension or flexion and 4 s of recovery until exhaustion (Conchola, Thiele, Palmer, Smith, & Thompson, 2015). During the isometric exercise, the participants were required to hold a horizontal line corresponding to 70% of the knee‐extensors or knee‐flexors MVC on a monitor displaying the force exerted in real time, as previously used (Boccia, Coratella, et al., 2016; Boccia, Dardanello, et al., 2016; Boccia, Dardanello, Coratella, et al., 2015; Boccia, Dardanello, Rinaldo, et al., 2015).…”
Section: Methodsmentioning
confidence: 99%
“…The present study comes with some acknowledged limitations. Firstly, only two muscles (biceps 347 femoris and vastus lateralis) were selected to represent the knee-flexors and knee-extensors EMG 348 activity respectively (Conchola et al, 2015). Since the complex morphology in knee-flexors and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 In conclusion, a standardized intermittent sub-maximal isometric fatiguing protocol induced similar 361 decreases in isometric MVC in both knee-flexors and knee-extensors.…”
mentioning
confidence: 99%
“…For the current study to have 90% statistical power with an alpha level of 0.05, it would require at least 22 (same-sex) volunteers, according to data from a previous investigation on how neuromuscular fatigue impacts electromechanical delay (EMD) values. The power calculations were based on an effect size of 1.47 when investigating the impact of fatigue on EMD values for hip flexor muscles 33 . The inclusion criteria for athletes with CLBP and non-CLBP were: players ranging from 20 to 35 years old who have at least four years' history of playing in the Iranian super-league and first division league.…”
Section: Methodsmentioning
confidence: 99%