Increased vulnerability to eccentric exercise-induced dysfunction and muscle injury after concentric training

Archives of Physical Medicine and Rehabilitation
L L Ploutz-SnyderG A Dudley

Abstract

To test whether concentric (CON)-only resistance training increases the vulnerability to eccentric (ECC) exercise-induced dysfunction and muscle injury. Before-after trial. General community. Nine men (77 +/- 3 kg body weight) who were not trained in resistance exercise. Nine weeks of CON-only training of the left quadriceps femoris (QF); performance of 10 sets of 10 ECC actions with each QF using a load equivalent to 85% of the posttraining CON 1-repetition maximum (1RM). CON 1RM for the untrained and trained QF measured immediately after training, and again 1, 3, 8, and 10 days after the bout of ECC exercise; cross-sectional area and spin-spin relaxation time (T2) of each QF determined by magnetic resonance imaging (MRI) before and 3 days after the ECC exercise bout. As a result of the ECC bout, the CON 1RM was reduced by approximately 30% in the trained limb and 16% in the untrained limb. Strength did not return to normal in the trained limb even after 10 days of recovery; however, in the untrained limb strength was restored by day 8. As assessed by MRI, the trained limb showed a greater area of muscle injury compared with the untrained QF. The T2 of the injured area was similar in both limbs, suggesting that the intensity o...Continue Reading

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Citations

Jul 20, 2007·Inflammopharmacology·G A Dudley
Aug 7, 2001·The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences·A C BaldwinG A Dudley
Aug 29, 2001·The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences·L L Ploutz-SnyderA E Rosenbaum
Mar 29, 2003·British Journal of Sports Medicine·N GleesonM McHugh
Jan 7, 2004·Medicine and Science in Sports and Exercise·Robin J LundKathy D Browder
Aug 8, 2008·Medicine and Science in Sports and Exercise·Christopher D Black, Kevin K McCully
Jun 14, 2008·Journal of Strength and Conditioning Research·Michael J NewtonKazunori Nosaka
Feb 20, 2007·Scandinavian Journal of Medicine & Science in Sports·M KilgallonA Shafat
Nov 6, 2014·PloS One·C Martyn BeavenHans-Christer Holmberg
Oct 9, 1998·The Journal of Physiology·N P WhiteheadU Proske
Dec 15, 2015·Physiological Reports·Nikos V MargaritelisMichalis G Nikolaidis
Dec 15, 2007·Journal of Applied Physiology·Christopher D BlackGary A Dudley
Sep 17, 2019·Medicine and Science in Sports and Exercise·Wei-Chin TsengTrevor C Chen
Jan 10, 2002·Medicine and Science in Sports and Exercise·Kazunori Nosaka, Mike Newton
Nov 1, 2002·American Journal of Physical Medicine & Rehabilitation·Priscilla M Clarkson, Monica J Hubal

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