Skeletal muscle morphology and function in former elite distance runners : a 20 year follow-up

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dc.contributor.advisor Costill, David L. en_US Trappe, Scott W. en_US 2011-06-03T19:31:54Z 2011-06-03T19:31:54Z 1994 en_US 1994
dc.identifier LD2489.Z68 1994 .T7 en_US
dc.description.abstract The purpose of this investigation was to examine the effects of 20 years of distance running training on the morphological and functional characteristics of skeletal muscle. Sixty men (current age = 49.2 ± 2.4 yr.) were first studied between 1966-1974 when they were all highly trained. Based on their training regimens in the interim between testing, subjects were described as highly trained (HI), fitness trained (FIT) or untrained (UT). Gastrocnemius muscle biopsy samples revealed an increase (p<0.05) in the proportion of type I fibers of the FIT (52.9 ± 5.3 vs. 61.9 ± 5.2%) and UT (56.3 ± 2.9 vs. 65.4 ± 3.8%) groups, while the HI group, who was initially characterized by a high percentage (>70%) of type I muscle fibers, was unchanged. Among the elite distance runners who had continued high volume, high intensity running, succinate dehydrogenase (SDH) activity and type I and type II muscle fiber areas were similar between evaluations. In 1993, the HI group had higher (p<0.05) SDH and citrate synthase (CS) activities compared with the FIT and UT groups, whereas phosphorylase activity did not differ. Capillary density and capillary-to-fiber ratio were also greater (p<0.05) in the HI group compared with the other two groups. Isokinetic plantar flexion strength at 60°/s and 180°/s and cross-sectional area (CT scans) of the lower leg (gastrocnemius and soleus) were similar among groups. These data suggest that aging may have a significant effect upon the distribution of muscle fibers and may be dependent upon fiber composition as a young adult. In addition, sustained endurance training appears to maintain the oxidative characteristics of the skeletal muscle, but does not provide an advantage in absolute calf muscle strength compared with individuals who train considerably less or not at all. en_US
dc.description.sponsorship School of Physical Education
dc.format.extent viii, 104 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Older athletes -- Physiology. en_US
dc.subject.lcsh Muscle strength. en_US
dc.subject.lcsh Runners (Sports) -- Physiology. en_US
dc.subject.lcsh Aging -- Physiological aspects. en_US
dc.title Skeletal muscle morphology and function in former elite distance runners : a 20 year follow-up en_US Thesis (Ph. D.) en_US
dc.identifier.cardcat-url en_US

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  • Doctoral Dissertations [3248]
    Doctoral dissertations submitted to the Graduate School by Ball State University doctoral candidates in partial fulfillment of degree requirements.

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