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  • Muscle fiber types  (1)
  • inheritance and joint segregation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Genetic variation, inheritance, and quaternary structure of malic enzyme in brook trout (Salvelinus fontinalis) (1979)
    Springer
    Biochemical genetics 17 (1979), S. 599-619 
    Details
    ISSN: 1573-4927
    Keywords: malic enzyme ; inheritance and joint segregation ; brook trout ; quaternary structure ; interspecies hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electrophoretic variation is described for malic enzyme (ME) for the first time in brook trout (Salvelinus fontinalis). Since the quaternary structure of ME was not clear from examination of banding patterns in brook trout alone, ME phenotypes in rainbow trout (Salmo gairdneri) × brook trout hybrids as well as in esocid species demonstrated that ME is tetrameric. A model of two duplicated loci is proposed to account for the observed variation. One locus (ME-2) is fixed and one locus (ME-1) is variable with three electrophoretically distinct alleles; the protein products of ME-1 are reduced in activity relative to the protein products of ME-2. Joint segregation was examined between ME-1 and ten other biochemical loci in brook trout, and between ME-1, ME-2, and nine other biochemical loci in a splake—lake trout (Salvelinus namaycush) × brook trout hybrid—backcross. All pairwise examinations showed random assortment except ME-2 with an isocitrate dehydrogenase locus (IDH-3), which showed complete linkage in the splake backcross. This may be due to a chromosomal aberration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502121
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Recovery from short term intense exercise: Its relation to capillary supply and blood lactate concentration (1983)
    Springer
    European journal of applied physiology 52 (1983), S. 98-103 
    Details
    ISSN: 1439-6327
    Keywords: Fatigue ; Mean fiber area ; Muscle fiber types ; Capillary density ; Peak torque
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Muscle force recovery from short term intense exercise was examined in 16 physically active men. They performed 50 consecutive maximal voluntary knee extensions. Following a 40-s rest period five additional maximal contractions were executed. The decrease in torque during the 50 contractions and the peak torque during the five contractions relative to initial torque were used as indices for fatigue and recovery, respectively. Venous blood samples were collected repeatedly up to 8 min post exercise for subsequent lactate analyses. Muscle biopsies were obtained from m. vastus lateralis and analysed for fiber type composition, fiber area, and capillary density. Peak torque decreased 67 (range 47–82%) as a result of the repeated contractions. Following recovery, peak torque averaged 70 (47–86%) of the initial value. Lactate concentration after the 50 contractions was 2.9±1.3 mmol·l−1 and the peak post exercise value averaged 8.7±2.1 mmol·l−1. Fatigue and recovery respectively were correlated with capillary density (r=−0.71 and 0.69) but not with fiber type distribution. A relationship was demonstrated between capillary density and post exercise/peak post exercise blood lactate concentration (r=0.64). Based on the present findings it is suggested that lactate elimination from the exercising muscle is partly dependent upon the capillary supply and subsequently influences the rate of muscle force recovery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429033
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    Paper (German National Licenses)
    Fulltext
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