Linked Life Data

16337226

Source:http://linkedlifedata.com/resource/pubmed/id/16337226

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2006-5-30
pubmed:abstractText
We hypothesised that the fundamental (Phase II) component of pulmonary oxygen uptake (VO(2)) kinetics would be significantly slower when step transitions to severe intensity cycle exercise were initiated from elevated baseline metabolic rates, and that this would be associated with evidence for a greater activation of higher-order (i.e. type II) muscle fibres. Seven male subjects (age 22-34 years) completed repeat step transitions to a severe (S) work rate, estimated to require 100% VO(2) peak, from a baseline of: (1) 3 min of unloaded cycling (L-->S); (2) 6 min of moderate exercise (M-->S); (3) 6 min of heavy exercise (H-->S). Pulmonary gas exchange and the electromyogram (EMG) of the m. vastus lateralis were measured throughout all exercise tests. The Phase II VO(2) kinetics became progressively slower at higher baseline metabolic rates (tau was 37 +/- 6, 59 +/- 23, and 93 +/- 50 s for L-->S, M-->S, and H-->S, respectively; P < 0.05 between L-->S and H-->S). Both the integrated EMG and the mean power frequency were significantly higher immediately before the step transition to severe exercise when it was initiated from higher metabolic rates. Although indirect, these data suggest that the slower Phase II VO(2) kinetics observed at higher baseline metabolic rates was related to alterations in muscle activation and fibre recruitment patterns.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1569-9048
pubmed:author
pubmed:issnType
Print
pubmed:volume
152
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
204-19
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Influence of initial metabolic rate on pulmonary O2 uptake on-kinetics during severe intensity exercise.
pubmed:affiliation
Department of Exercise and Sport Science, Manchester Metropolitan University, UK.
pubmed:publicationType
Journal Article, Clinical Trial, Comparative Study