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Titolo:
MR measurements of muscle damage and adaptation after eccentric exercise
Autore:
Foley, JM; Jayaraman, RC; Prior, BM; Pivarnik, JM; Meyer, RA;
Indirizzi:
Michigan State Univ, Dept Kinesiol, E Lansing, MI 48824 USA Michigan StateUniv E Lansing MI USA 48824 esiol, E Lansing, MI 48824 USA Michigan State Univ, Dept Physiol, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 ysiol, E Lansing, MI 48824 USA Michigan State Univ, Dept Radiol, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 adiol, E Lansing, MI 48824 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 6, volume: 87, anno: 1999,
pagine: 2311 - 2318
SICI:
8750-7587(199912)87:6<2311:MMOMDA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
SKELETAL-MUSCLE; INDUCED INJURY; INTENSITY; SORENESS; STRENGTH; RELAXATION; STIFFNESS; INDEXES; FIBERS; IMAGES;
Keywords:
magnetic resonance imaging; delayed-onset muscle soreness; repeated-bout effect;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Foley, JM Michigan State Univ, Dept Kinesiol, Rm 3 IM Sports Circle, E Lansing, MI 48824 USA Michigan State Univ Rm 3 IM Sports Circle E Lansing MI USA 48824
Citazione:
J.M. Foley et al., "MR measurements of muscle damage and adaptation after eccentric exercise", J APP PHYSL, 87(6), 1999, pp. 2311-2318

Abstract

The purposes of this study were, first, to clarify the long-term pattern of T2 relaxation times and muscle volume changes in human skeletal muscle after intense eccentric exercise and, second, to determine whether the T2 response exhibits an adaptation to repeated bouts. Six young adult men performed two bouts of eccentric biceps curls (5 sets of 10 at 110% of the 1-repetition concentric maximum) separated by 8 wk. Blood samples, soreness ratings, and Ta-weighted axial fast spin-echo magnetic resonance images of the upper arm were obtained immediately before and after each bout; at 1, 2, 4, 7, 14, 21, and 56 days after bout 1; and at 2, 4, 7 and 14 days after bout 2. Resting muscle T2 [27.6 +/- 0.2 (SE) ms] increased immediately postexercise by 8 +/- 1 ms after both bouts. T2 peaked 7 days after bout 1 at 47 +/- 4 ms and remained elevated by 2.5 ms at 56 days. T2 peaked lower (37 +/- 4 ms) and earlier (2-4 days) after bout 2, suggesting an adaptation of the T2response. Peak serum creatine kinase values, pain ratings, and flexor muscle swelling were also significantly lower after the second bout (P < 0.05). Total volume of the imaged arm region increased transiently after bout 1 but returned to preexercise values within 2 wk. The exercised flexor compartment swelled by over 40%, but after 2 wk it reverted to a volume 10% smaller than that before exercise and maintained this volume loss through 8 wk, consistent with partial or total destruction of a small subpopulation of muscle fibers.

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Documento generato il 27/11/20 alle ore 01:52:44