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Search: WFRF:(PloutzSnyder LL)

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  • PLOUTZSNYDER, LL, et al. (author)
  • Effect of unweighting on skeletal muscle use during exercise
  • 1995
  • In: Journal of applied physiology (Bethesda, Md. : 1985). - : American Physiological Society. - 8750-7587 .- 1522-1601. ; 79:1, s. 168-175
  • Journal article (peer-reviewed)abstract
    • Exercise-induced spin-spin relaxation time (T2) shifts in magnetic resonance (MR) images were used to test the hypothesis that more muscle would be used to perform a given submaximal task after 5 wk of unweighting. Before and after unilateral lower limb suspension (ULLS), 7 subjects performed 5 sets of 10 unilateral concentric actions with the quadriceps femoris muscle group (QF) at each of 4 loads: 25, 40, 55, and 70% of maximum. T2-weighted MR images of the thigh were collected at rest and after each relative load. ULLS elicited a 20% decrease in strength of the left unweighted QF and a 14% decrease in average cross-sectional area (CSA) with no changes in the right weight-bearing QF. Average CSA of the left or right QF showing exercise-induced T2 shift increased as a function of exercise intensity both before and after ULLS. On average, 12 +/- 1, 15 +/- 2, 18 +/- 2, and 22 +/- 1 cm2 of either QF showed elevated T2 for the 25, 40, 55, and 70% loads, respectively, before ULLS. Average CSA of the left but not the right QF, showing elevated T2 after ULLS, was increased to 16 +/- 2, 23 +/- 3, 31 +/- 7, and 39 +/- 5 cm2, respectively. The results indicated that unweighting increased exercise-induced T2 shift in MR images, presumably due to greater muscle mass involvement in exercise after than before unweighting, suggesting a change in motor control.
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  • Result 1-3 of 3
Type of publication
journal article (3)
Type of content
peer-reviewed (3)
Author/Editor
PloutzSnyder, LL (3)
Tesch, P.A (1)
Tesch, PA (1)
Nyren, S (1)
Dudley, G.A (1)
Hather, B.M (1)
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Cooper, TG (1)
Potchen, EJ (1)
Dudley, GA (1)
Ploutz-Snyder, L.L (1)
Meyer, RA (1)
CRITTENDEN, DJ (1)
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University
Karolinska Institutet (3)
Mid Sweden University (1)
Language
English (3)
Research subject (UKÄ/SCB)
Medical and Health Sciences (1)

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