Relevance of the EMG/Grip Relationship in Isometric Anisotonic Conditions

Claudon, Laurent

doi:10.1080/10803548.2003.11076558

Cited by 13 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As reported previously (Claudon 1998(Claudon , 2003Duque et al 1995;Li 2002;Mogk and Keir 2003a, b), MGF was also present at medium wrist extension in this study. Because range of motion for wrist Xexion/extension direction was diVerent among individuals, there is a possibility that optimal wrist angle at MGF appeared at more than one wrist angle.…”

Section: Maximal Gripping Force and Wrist Anglesupporting

confidence: 81%

“…It is thought that this decreased force at wrist Xexion is associated with the muscle lengthtension relationship of agonist (Wnger Xexors) and tension development in the antagonists (Wnger extensors) (Li 2002). These studies have suggested that extensor activation for maintaining optimal wrist position is important in order to achieve greater gripping force eVectively (Claudon 1998(Claudon , 2003Duque et al 1995;Li 2002;Mogk and Keir 2003a, b;O'Driscoll et al 1992) and gripping force is produced by the complex activation of forearm muscles. However, forearm muscles have a complex function (Johnston et al 2005;Winges and Santello 2004), and the neurophysiological mechanisms of strength gains of maximal gripping force have remained elusive.…”

Section: Introductionmentioning

confidence: 94%

“…Although the wrist can move in extension/Xexion and radial/ulnar deviation, Li (2002) indicated that the eVect of wrist deviation in Xexion/extension motion was more remarkable than in radial/ulnar deviation (Li 2002). O'Driscoll et al (1992) has reported that maximal gripping force appears at approximately 35° of wrist extension and many investigators have demonstrated that maximal gripping force was obtained in the range of 20° to 45° extension and reduced as the wrist is Xexed (Claudon 1998(Claudon , 2003Duque et al 1995;Li 2002;Mogk and Keir 2003a, b). It is thought that this decreased force at wrist Xexion is associated with the muscle lengthtension relationship of agonist (Wnger Xexors) and tension development in the antagonists (Wnger extensors) (Li 2002).…”

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

Effect of submaximal isometric wrist extension training on grip strength

2010

View full text Add to dashboard Cite

Gripping force is produced by co-contraction of forearm flexors and extensors. Activation of extensors is important for stabilizing the wrist during gripping. However, forearm muscle function is complicated and the neurophysiological mechanism responsible for the gain in gripping force is unclear. Therefore, the purpose of this study was to investigate whether increasing forearm extensor activation with isometric wrist extension training has an effect on gripping force. Thirteen healthy subjects participated in this study. Maximal voluntary contraction of gripping was measured using a piezosensor (MVC(grip)) and EMG of forearm muscles at every wrist angle (from 70° flexion to 80° extension with 10° intervals) were measured simultaneously at baseline, 4 weeks, and 8 weeks after training. Training consisted of 30 repetitions equal to 70% MVC of isometric wrist extension for 8 weeks (5/week) on the right side. Gripping force was measured on both sides using a grip dynamometer without wrist angle restriction. Gripping force, EMG, maximal wrist extension force, and wrist angle-gripping force curve were investigated after training. After training, maximal wrist extension force increased significantly. Gripping force on the trained side also increased significantly. The training changed wrist angle at peak of MVC(grip). EMG activation of forearm extensors increased and that of flexors decreased during gripping. These results suggest that wrist extension training leads to an increase in gripping force and changes the balance of EMG activation between forearm flexors and extensors during gripping. Therefore, this training method should be useful as a therapeutic strategy for increasing grip strength.

show abstract

Section: Maximal Gripping Force and Wrist Anglesupporting

confidence: 81%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Effect of submaximal isometric wrist extension training on grip strength

2010

View full text Add to dashboard Cite

show abstract

“…Investigations have shown that the optimal wrist position to generate grip force occurs between a range of 20° to 45° extension (Claudon, 1998(Claudon, , 2003Duque, Masset, & Malchaire, 1995;Li, 2002), with a maximal grip force achieved at 35° wrist extension (O'Driscoll et al, 1991). Grip force at angles other than this optimal position has been shown to be significantly weaker (Claudon, 1998(Claudon, , 2003Volz, Lieb, & Benjamin, 1980). In a flexed wrist position, the maximal grip force is reduced by approximately 50%, despite greater electromyography of the extensor muscles (Duque et al, 1995;Mogk & Keir, 2003b).…”

Section: Importance Of Human Gripmentioning

confidence: 99%

“…On the basis of the presence of potential muscles synergies which might be altered with pain and the sensorimotor system changes identified in individuals with LE discussed above, it is unknown whether muscle synergies are altered in individuals with LE compared to a pain-free control (Study 5, see Chapter 9). Investigations have shown that the optimal wrist position to generate grip force occurs between a range of 20° to 45° extension (Claudon, 1998(Claudon, , 2003Duque, Masset, & Malchaire, 1995;Li, 2002), with a maximal grip force achieved at 35° wrist extension (O'Driscoll et al, 1991). Grip force at angles other than this optimal position has been shown to be significantly weaker (Claudon, 1998(Claudon, , 2003Volz, Lieb, & Benjamin, 1980).…”

Section: Importance Of Human Gripmentioning

confidence: 99%

Towards an understanding of motor system impairments in individuals with unilateral lateral epicondylalgia

Heales¹

View full text Add to dashboard Cite

Human grip is commonly used in sport and recreational activities and involves the coordinated activation of forearm muscles. Lateral epicondylalgia (LE) is a common musculoskeletal disorder that involves pathology of the tendon of extensor carpi radialis brevis (ECRB) at its insertion onto the lateral epicondyle of the humerus. LE presents clinically as pain provoked by gripping activities and has a major impact on function. This results in days off work and time off sport. Despite considerable research into the pathophysiology of LE, it remains poorly understood whether forearm muscles activity is altered during gripping in individuals with LE. This thesis aimed to comprehensively understand the extent of current knowledge and provide new data of activity of the wrist/forearm muscles in LE.Study 1 clarifies the current understanding of muscle activity in LE by way of systematic review with quantitative analysis. This review identified that studies of individuals with LE revealed altered motor unit morphology, abnormal patterns of muscle activity during resisted wrist extension and tennis strokes, fewer cortical peaks and less distance between cortical representation of muscles (mapped with transcranial magnetic stimulation), and delayed activation of wrist extensor muscles during gripping, when contrasted to pain-free controls. The latter finding was also present on the asymptomatic limb.Importantly, this systematic review identified limited understanding of gripping despite the clinical importance of this task in provocation of LE. The only study that had investigated muscle activity during this task had severe limitations that compromise the interpretation of the results. Limitations included the use of surface electromyography (which does not record from individual muscles), and performance of sustained contraction with high grip force (50% maximum voluntary contraction), which is likely to be provocative of pain in some individuals with LE.On the basis of some evidence of sensorimotor changes in the asymptomatic limb of individuals with unilateral LE, Study 2 was conducted as a systematic review with meta-analysis to determine the extent bilateral differences in sensorimotor function between individuals with unilateral tendinopathy and pain-free controls. Study 2 identified evidence for several sensory and motor system differences, ii and evidence for tendon pathology in the asymptomatic limb of individuals with other unilateral tendinopathies (Achilles tendinopathy) but not LE when contrasted to pain-free controls.On the foundation that tendon pathology was present in asymptomatic limb of individuals with Achilles tendinopathy, Study 3 investigated whether there was a greater prevalence of tendon pathology of the asymptomatic common extensor tendon of individuals with LE than pain-free controls. Unlike the findings in the Achilles tendon, Study 3 did not identify greater tendon pathology in the asymptomatic limb of individuals with unilateral LE than that present in the tendons of pain-free individ...

show abstract

Biomechanics and Physical Ergonomics

Lee

Jung

2013

Handbook of Loss Prevention Engineering

View full text Add to dashboard Cite

Relevance of the EMG/Grip Relationship in Isometric Anisotonic Conditions

Cited by 13 publications

References 8 publications

Effect of submaximal isometric wrist extension training on grip strength

Effect of submaximal isometric wrist extension training on grip strength

Towards an understanding of motor system impairments in individuals with unilateral lateral epicondylalgia

Biomechanics and Physical Ergonomics

Contact Info

Product

Resources

About