Attenuation of eccentric exercise-induced muscle damage by preconditioning exercises

Chen, Trevor Chung-Ching, Chen, Hsin-Lian, Pearce, Alan J. and Nosaka, Kazunori 2012, Attenuation of eccentric exercise-induced muscle damage by preconditioning exercises, Medicine and science in sports and exercise, vol. 44, no. 11, pp. 2090-2098, doi: 10.1249/MSS.0b013e31825f69f3.

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Title Attenuation of eccentric exercise-induced muscle damage by preconditioning exercises
Author(s) Chen, Trevor Chung-Ching
Chen, Hsin-Lian
Pearce, Alan J.
Nosaka, Kazunori
Journal name Medicine and science in sports and exercise
Volume number 44
Issue number 11
Start page 2090
End page 2098
Total pages 9
Publisher Lippincott Williams and Wilkins
Place of publication Philadelphia, Pa.
Publication date 2012-11
ISSN 0195-9131
Keyword(s) Arm
Creatine Kinase
Elbow Joint
Isometric Contraction
Muscle, Skeletal
Range of Motion, Articular
Resistance Training
Wounds and Injuries
Young Adult
Science & Technology
Life Sciences & Biomedicine
Sport Sciences
Summary PURPOSE: This study compared the effect of an initial exercise consisting of either low-intensity eccentric or maximal isometric contractions (ISOs) on protective effect against maximal eccentric contraction (MaxECC)-induced muscle damage.
METHODS: Untrained young men were placed into one of five groups (n = 13 per group): MaxECC, 10% ECC, 20% ECC, 90° ISO, and 20° ISO. The MaxECC, 10% ECC, and 20% ECC groups performed 30 ECCs of the elbow flexors using a dumbbell equivalent to 100%, 10%, and 20% of maximal voluntary isometric contraction strength, respectively. The 90° ISO and 20° ISO groups performed 30 ISOs at 90° and 20° of elbow flexion, respectively. Three weeks later, all subjects performed 30 MaxECCs with the arm used for the first bout. Changes in maximal voluntary isometric and concentric contraction strength, range of motion, upper arm circumference, plasma creatine kinase and myoglobin concentration, and muscle soreness before and for 5 d after the first and second exercise bouts were compared among groups by a two-way repeated-measure ANOVA.
RESULTS: Changes in all measures after the first bout were smaller (P < 0.05) for 10% ECC, 20% ECC, 90° ISO, and 20° ISO groups compared with MaxECC group, and the changes were smaller (P < 0.05) for 10% ECC and 90° ISO than 20° ISO and 20% ECC groups. When compared with the first bout of MaxECC group, changes in the measures after the second bout were smaller for 20% ECC and 20° ISO groups with greater protective effect evident for 20° ISO group, but the protective effect conferred by these was smaller (P < 0.05) compared with MaxECCs.
CONCLUSION: These results suggest that there is threshold intensity for ECCs to confer protective effect, and ISOs at a long muscle length provide preconditioning effect.
Language eng
DOI 10.1249/MSS.0b013e31825f69f3
Field of Research 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
1106 Human Movement And Sports Science
Socio Economic Objective 920499 Public Health (excl. Specific Population Health) not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2012, American College of Sports Medicine
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Document type: Journal Article
Collections: Faculty of Health
School of Psychology
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