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dc.contributor.authorPaschalis, Vassilios
dc.contributor.authorKoutedakis, Yiannis
dc.contributor.authorJamurtas, Athanasios Z.
dc.contributor.authorMougios, Vassilis
dc.contributor.authorBaltzopoulos, Vassilios
dc.date.accessioned2010-09-20T13:18:42Z
dc.date.available2010-09-20T13:18:42Z
dc.date.issued2005
dc.identifier.citationJournal of strength and conditioning research, 19(1): 184-8
dc.identifier.issn1064-8011
dc.identifier.pmid15705032
dc.identifier.doi10.1519/R-14763.1
dc.identifier.urihttp://hdl.handle.net/2436/111440
dc.description.abstractWe examined differences in muscle damage and muscle performance perturbations in relation to the same volumes of high (HI) and low intensity (LI) of eccentric exercise. Untrained young healthy men (n = 12) underwent 2 isokinetic quadriceps eccentric exercise sessions, 1 on each randomly selected leg, separated by a 2-week interval. In the first session subjects performed HI exercise (i.e., 12 sets of 10 maximal voluntary efforts). In the second session, volunteers were subjected to continuous exercise of LI (50% of peak torque) until the total work done was approximately equal to that generated during HI. Muscle damage (serum creatine kinase concentration [CK], delayed onset of muscle soreness, and range of motion) and muscle performance (eccentric [EPT] and isometric peak torque [IPT]) indicators were assessed pre-exercise and 24, 48, 72, and 96 hours postexercise. Compared to baseline data, changes in muscle damage indicators were significantly different (p < 0.05) at almost all postexercise time points in both conditions. However, apart from the significant elevation of CK at 24 hours after HI (p < 0.05), no other significant differences were observed between the 2 exercise conditions (p > 0.05). The main finding in relation to muscle performance was that decrements following HI exercise were significantly greater (p < 0.05) compared to LI. Compared with baseline data, the EPT values following HI and LI exercise were as follows: 24 hours, 72.1% vs. 92%; 48 hours, 81.9% vs. 94.8%; 72 hours, 77.7% vs. 100.6%; 96 hours, 86.8% vs. 107.9%. The corresponding data for IPT were as follows: 24 hours, 86.4% vs. 102.8%; 48 hours, 84.2% vs. 107%; 72 hours, 84.8% vs. 109.2%; 96 hours, 86.8% vs. 114.4%. These results indicate that matching volumes of HI and LI eccentric exercise have similar effects on muscle damage, but HI has a more prominent effect on muscle performance.
dc.language.isoen
dc.publisherHuman Kinetics Publishers, Inc.
dc.relation.urlhttp://proquest.umi.com/pqdweb?RQT=572&TS=1284117236&clientId=53702&VType=PQD&VName=PQD&VInst=PROD&PMID=68236&PCID=15550201&SrtM=0&SrchMode=3&aid=5
dc.subjectIsokinetic dynamometry
dc.subjectPeak torque
dc.subjectCreatine kinase
dc.subjectDelayed onset muscle soreness
dc.subjectRange of motion
dc.subject.meshAdult
dc.subject.meshCreatine Kinase
dc.subject.meshExercise
dc.subject.meshHumans
dc.subject.meshLeg
dc.subject.meshMale
dc.subject.meshMuscle, Skeletal
dc.subject.meshRange of Motion, Articular
dc.subject.meshTime Factors
dc.subject.meshTorque
dc.titleEqual volumes of high and low intensity of eccentric exercise in relation to muscle damage and performance.
dc.typeJournal article
dc.identifier.journalJournal of strength and conditioning research / National Strength & Conditioning Association
html.description.abstractWe examined differences in muscle damage and muscle performance perturbations in relation to the same volumes of high (HI) and low intensity (LI) of eccentric exercise. Untrained young healthy men (n = 12) underwent 2 isokinetic quadriceps eccentric exercise sessions, 1 on each randomly selected leg, separated by a 2-week interval. In the first session subjects performed HI exercise (i.e., 12 sets of 10 maximal voluntary efforts). In the second session, volunteers were subjected to continuous exercise of LI (50% of peak torque) until the total work done was approximately equal to that generated during HI. Muscle damage (serum creatine kinase concentration [CK], delayed onset of muscle soreness, and range of motion) and muscle performance (eccentric [EPT] and isometric peak torque [IPT]) indicators were assessed pre-exercise and 24, 48, 72, and 96 hours postexercise. Compared to baseline data, changes in muscle damage indicators were significantly different (p < 0.05) at almost all postexercise time points in both conditions. However, apart from the significant elevation of CK at 24 hours after HI (p < 0.05), no other significant differences were observed between the 2 exercise conditions (p > 0.05). The main finding in relation to muscle performance was that decrements following HI exercise were significantly greater (p < 0.05) compared to LI. Compared with baseline data, the EPT values following HI and LI exercise were as follows: 24 hours, 72.1% vs. 92%; 48 hours, 81.9% vs. 94.8%; 72 hours, 77.7% vs. 100.6%; 96 hours, 86.8% vs. 107.9%. The corresponding data for IPT were as follows: 24 hours, 86.4% vs. 102.8%; 48 hours, 84.2% vs. 107%; 72 hours, 84.8% vs. 109.2%; 96 hours, 86.8% vs. 114.4%. These results indicate that matching volumes of HI and LI eccentric exercise have similar effects on muscle damage, but HI has a more prominent effect on muscle performance.


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