2.50
Hdl Handle:
http://hdl.handle.net/2436/111077
Title:
Maximal voluntary quadriceps strength patterns in Olympic overtrained athletes.
Authors:
Koutedakis, Yiannis; Frischknecht, R.; Vrbová, G.; Sharp, N. C. Craig; Budgett, Richard
Abstract:
Peak torques were studied in 10 elite male overtrained athletes and 10 controls matched for sex, age, sport, and performance level. Isokinetic concentric (CON) and eccentric (ECC) maximal voluntary contractions (MVC) of quadriceps muscle were assessed at the angular velocities of 60 degrees, 120 degrees, and 180 degrees.s-1. Sustained isometric MVCs were also measured at knee angles of 10 degrees, 45 degrees, and 80 degrees of flexion. Six seconds after the beginning of each isometric MVC, a 40-Hz electrical stimulation was superimposed on the MVC for a further 6 s. The overtrained subjects developed significantly smaller CON peak torques at 180 degrees.s-1 (P < 0.001), although ECC torques were similar at all three velocities. ECC/CON ratios were higher in the overtrained subjects at 120 degrees.s-1 (P < 0.01) and 180 degrees.s-1 (P < 0.001) compared with the controls. Isometric MVCs at 10 degrees and 45 degrees knee flexion were lower in the overtrained at P < 0.01 and P < 0.05, respectively. Also in the overtrained subjects, at knee angle of 10 degrees, the addition of the electrical stimulation to the isometric MVC produced an increase (P < 0.05) in torque levels. It is suggested that impaired central drive may account for the present findings.
Affiliation:
School of Health Sciences, Wolverhampton University, Wolverhampton, England.
Citation:
Medicine and science in sports and exercise, 27(4): 566-72
Publisher:
American College of Sports Medicine
Journal:
Medicine and science in sports and exercise
Issue Date:
1995
URI:
http://hdl.handle.net/2436/111077
PubMed ID:
7791588
Type:
Article
Language:
en
ISSN:
0195-9131
Appears in Collections:
Sport, Exercise and Health Research Group

Full metadata record

DC FieldValue Language
dc.contributor.authorKoutedakis, Yiannisen
dc.contributor.authorFrischknecht, R.en
dc.contributor.authorVrbová, G.en
dc.contributor.authorSharp, N. C. Craigen
dc.contributor.authorBudgett, Richarden
dc.date.accessioned2010-09-13T13:51:15Z-
dc.date.available2010-09-13T13:51:15Z-
dc.date.issued1995-
dc.identifier.citationMedicine and science in sports and exercise, 27(4): 566-72en
dc.identifier.issn0195-9131-
dc.identifier.pmid7791588-
dc.identifier.urihttp://hdl.handle.net/2436/111077-
dc.description.abstractPeak torques were studied in 10 elite male overtrained athletes and 10 controls matched for sex, age, sport, and performance level. Isokinetic concentric (CON) and eccentric (ECC) maximal voluntary contractions (MVC) of quadriceps muscle were assessed at the angular velocities of 60 degrees, 120 degrees, and 180 degrees.s-1. Sustained isometric MVCs were also measured at knee angles of 10 degrees, 45 degrees, and 80 degrees of flexion. Six seconds after the beginning of each isometric MVC, a 40-Hz electrical stimulation was superimposed on the MVC for a further 6 s. The overtrained subjects developed significantly smaller CON peak torques at 180 degrees.s-1 (P < 0.001), although ECC torques were similar at all three velocities. ECC/CON ratios were higher in the overtrained subjects at 120 degrees.s-1 (P < 0.01) and 180 degrees.s-1 (P < 0.001) compared with the controls. Isometric MVCs at 10 degrees and 45 degrees knee flexion were lower in the overtrained at P < 0.01 and P < 0.05, respectively. Also in the overtrained subjects, at knee angle of 10 degrees, the addition of the electrical stimulation to the isometric MVC produced an increase (P < 0.05) in torque levels. It is suggested that impaired central drive may account for the present findings.en
dc.language.isoenen
dc.publisherAmerican College of Sports Medicineen
dc.subjectConcentric and eccentric isokinetic exerciseen
dc.subjectIsometric exerciseen
dc.subjectElectrical stimulationen
dc.subjectCentral driveen
dc.subjectMotoneuronesen
dc.subject.meshAdulten
dc.subject.meshAge Factorsen
dc.subject.meshElectric Stimulationen
dc.subject.meshFemaleen
dc.subject.meshHumansen
dc.subject.meshIsometric Contractionen
dc.subject.meshMaleen
dc.subject.meshMatched-Pair Analysisen
dc.subject.meshMuscle Contractionen
dc.subject.meshMuscle, Skeletalen
dc.subject.meshSex Factorsen
dc.subject.meshSportsen
dc.subject.meshThighen
dc.titleMaximal voluntary quadriceps strength patterns in Olympic overtrained athletes.en
dc.typeArticleen
dc.contributor.departmentSchool of Health Sciences, Wolverhampton University, Wolverhampton, England.en
dc.identifier.journalMedicine and science in sports and exerciseen
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