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Title: Equal volumes of high and low intensity of eccentric exercise in relation to muscle damage and performance.
Authors: Paschalis, Vassilios
Koutedakis, Yiannis
Jamurtas, Athanasios Z.
Mougios, Vassilis
Baltzopoulos, Vassilios
Citation: Journal of strength and conditioning research, 19(1): 184-8
Publisher: Human Kinetics Publishers, Inc.
Journal: Journal of strength and conditioning research / National Strength & Conditioning Association
Issue Date: 2005
DOI: 10.1519/R-14763.1
PubMed ID: 15705032
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Abstract: We 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.
Type: Article
Language: en
Keywords: Isokinetic dynamometry
Peak torque
Creatine kinase
Delayed onset muscle soreness
Range of motion
MeSH: Adult
Creatine Kinase
Muscle, Skeletal
Range of Motion, Articular
Time Factors
ISSN: 1064-8011
Appears in Collections: Sport, Exercise and Health Research Group

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