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Titolo:
Biarticular and monoarticular muscle activation and injury in human quadriceps muscle
Autore:
Prior, BM; Jayaraman, RC; Reid, RW; Cooper, TG; Foley, JM; Dudley, GA; Meyer, RA;
Indirizzi:
Univ Missouri, Dept Vet Biomed Sci, Columbia, MO 65211 USA Univ Missouri Columbia MO USA 65211 et Biomed Sci, Columbia, MO 65211 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 Kinesiol, E Lansing, MI 48824 USA Michigan StateUniv E Lansing MI USA 48824 esiol, 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 Univ Georgia, Dept Exercise Sci, Athens, GA 30602 USA Univ Georgia AthensGA USA 30602 Dept Exercise Sci, Athens, GA 30602 USA
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1-2, volume: 85, anno: 2001,
pagine: 185 - 190
SICI:
1439-6319(200107)85:1-2<185:BAMMAA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE IMAGES; CONTRACTION-INDUCED INJURY; RAT SOLEUS MUSCLE; SKELETAL-MUSCLE; ECCENTRIC EXERCISE; SORENESS; FORCE; MECHANISMS; ADAPTATION; INTENSITY;
Keywords:
delayed-onset muscle soreness (DOMS); eccentric exercise; MRI; quadriceps femoris; transverse relaxation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Prior, BM Univ Missouri, Dept Vet Biomed Sci, E102 Vet Med Bld,1600 Rollins Rd, Columbia, MO 65211 USA Univ Missouri E102 Vet Med Bld,1600 Rollins RdColumbia MO USA 65211
Citazione:
B.M. Prior et al., "Biarticular and monoarticular muscle activation and injury in human quadriceps muscle", EUR J A PHY, 85(1-2), 2001, pp. 185-190

Abstract

We hypothesized that activation of the quadriceps femoris muscle group during eccentric exercise is related to the increase in magnitude of several markers of muscle injury that developed during the next week. Fourteen male subjects performed six to eight sets of five to ten repetitions of single-leg eccentric-only seated knee extension exercise. Magnetic resonance (MR) images were collected before and immediately after exercise and on days 2-4 and 6 after eccentric exercise. Changes in maximal voluntary contraction (MVC), perceived soreness, muscle volume and muscle transverse relaxation of water protons (T-2) were determined for the quadriceps femoris muscle groupeach day. Changes in muscle volume and T-2 were determined every day for each muscle [vastus lateralis (VL), vastus medialis (VM), vastus intermedius(VI), rectus femoris (RF)] of the quadriceps femoris group. Post-exercise T-2 was greater than pre-exercise T-2 (P < 0.05) for all muscles. The acute<Delta>T-2 (Post-Pre) was similar (P > 0.05) among VL, VM, VI, and RF [5.5(0.3) ms], suggesting that the four muscles were equally activated during eccentric exercise. In the week after eccentric exercise, subjects experienced delayed-onset muscle soreness (DOMS) and all muscles demonstrated a delayed increase in T-2 above pre-exercise values (P < 0.05), suggesting that muscle injury had occurred. For the quadriceps femoris muscle group, there was no correlation between acute <Delta>T-2 and delayed (peak T-2 during days 2, 3, 4, 6 minus pre-exercise T-2) DeltaT(2) (r = -0.04, P > 0.05). Similar results were obtained when VL, VM, VI and RF were examined separately. Of the four muscles in quadriceps femoris, the biarticular RF experienced greater muscle injury [delayed DeltaT(2) = 15.2 (2.0) ms] compared to the three monoarticular vasti muscles [delayed DeltaT(2) = 7.7 (1.3) ms; P < 0.05]. We propose that the disproportionate muscle injury to RF resulted from an ineffective transfer of torque from the knee to hip joint during seated eccentric knee extension exercise, thus causing RF to dissipate greater energy than normal. We conclude that in humans, muscle activation is not a unique determinant of muscle injury.

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Documento generato il 27/11/20 alle ore 02:08:48