Adaptation to chronic eccentric exercise in humans: the influence of contraction velocity

Paddon-Jones, D., Leveritt, M., Lonergan, A. and Abernethy, P. (2001) Adaptation to chronic eccentric exercise in humans: the influence of contraction velocity. European Journal of Applied Physiology, 85 5: 466-471. doi:10.1007/s004210100467


Author Paddon-Jones, D.
Leveritt, M.
Lonergan, A.
Abernethy, P.
Title Adaptation to chronic eccentric exercise in humans: the influence of contraction velocity
Journal name European Journal of Applied Physiology   Check publisher's open access policy
ISSN 1439-6319
Publication date 2001-01-01
Year available 2001
Sub-type Article (original research)
DOI 10.1007/s004210100467
Open Access Status DOI
Volume 85
Issue 5
Start page 466
End page 471
Total pages 6
Editor P.E. di Prampero
Place of publication New York
Publisher Springer Verlag
Language eng
Subject C1
321401 Exercise Physiology
730199 Clinical health not specific to particular organs, diseases and conditions
Abstract We compared changes in muscle fibre composition and muscle strength indices following a 10 week isokinetic resistance training programme consisting of fast (3.14 rad(.)s(-1)) or slow (0.52 rad(.)s(-1)) velocity eccentric muscle contractions. A group of 20 non-resistance trained subjects were assigned to a FAST (n = 7), SLOW (n = 6) or non-training CONTROL (n = 7) group. A unilateral training protocol targeted the elbow flexor muscle group and consisted of 24 maximal eccentric isokinetic contractions (four sets of six repetitions) performed three times a week for 10 weeks. Muscle biopsy samples were obtained from the belly of the biceps brachii. Isometric torque and concentric and eccentric torque at 0.52 and 3.14 rad(.)s(-1) were examined at 0, 5 and 10 weeks. After 10 weeks, the FAST group demonstrated significant [mean (SEM)] increases in eccentric [29.6 (6.4)%] and concentric torque [27.4 (7.3) %] at 3.14 rad(.)s(-1), isometric torque [21.3 (4.3)%] and eccentric torque [25.2 (7.2) %] at 0.52 rad(.)s(-1). The percentage of type I fibres in the FAST group decreased from [53.8 (6.6)% to 39.1 (4.4)%] while type lib fibre percentage increased from [5.8 (1.9)% to 12.9 (3.3)%; P < 0.05]. In contrast. the SLOW group did not experience significant changes in muscle fibre type or muscle torque. We conclude that neuromuscular adaptations to eccentric training stimuli may be influenced by differences in the ability to cope with chronic exposure to relatively fast and slow eccentric contraction velocities. Possible mechanisms include greater cumulative damage to contractile tissues or stress induced by slow eccentric muscle contractions.
Keyword Physiology
Sport Sciences
Muscle
Histochemistry
Specificity
Strength
Training
Muscle Strength
Resistance
Fibers
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Human Movement and Nutrition Sciences Publications
 
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Created: Wed, 15 Aug 2007, 01:52:35 EST