Linked Life Data

6313564

Source:http://linkedlifedata.com/resource/pubmed/id/6313564

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1983-12-20
pubmed:abstractText
Blood flows to fast-twitch red (FTR), fast-twitch white (FTW), and slow-twitch red (STR) fiber sections of the gastrocnemius-soleus-plantaris muscle group of sedentary and trained rats were determined using radiolabeled microspheres during the 1st and 10th min of in situ contractions at frequencies ranging from 7.5 to 90 tetani/min. Treadmill training increased the cytochrome c content of both FTW (6.0 +/- 0.13 nmol/g to 12.2 +/- 0.27) and FTR (22.2 +/- 0.32 to 26.7 +/- 0.25) muscle. Loss of tension, evident at 15 tetani/min and above, was less (P less than 0.001) in trained animals. Although steady-state blood flows (10th min) to FTR and STR fibers were not altered by training, initial flows (1st min) to the trained FTR section were greater (P less than 0.025). Overall initial flows to both red fiber types were excessively high at the easier contraction conditions, but subsequently declined to values more reflective of the expected energy demands. This time-dependent relative hyperemia was not found in either sedentary or trained FTW muscle. However, training increased the maximal blood flow in the FTW sections [60 +/- 3.2 (n = 36) vs. 88 +/- 5.2 ml X min X 100 g-1 (n = 36)]. This 40-50% increase in FTW blood flow would produce only a modest 10% increase in blood flow to a whole mixed-fiber muscle, since the flow capacity of the FTW muscle is only one third to one fourth that of FTR muscle. This overall increase in blood flow, however, is similar to changes in VO2max found in trained rats.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0161-7567
pubmed:author
pubmed:issnType
Print
pubmed:volume
55
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1072-8
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
Influence of training on blood flow to different skeletal muscle fiber types.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't