| Kinetics of estimated human muscle capillary blood flow during recovery from exercise. | |
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MedLine Citation:
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PMID: 15908509 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The kinetic characteristics of muscle capillary blood flow (Qcap) during recovery from exercise are controversial (e.g. one versus two phases). Furthermore, it is not clear how the overall Qcap kinetics are temporally associated with muscle oxygen uptake (VO2m) kinetics. To address these issues, we examined the kinetics of Qcap estimated from the rearrangement of the Fick equation (Qcap=VO2m/C(a-v)O2) using the kinetics of pulmonary VO2 (VO2p, primary component) and deoxy-haemoglobin concentration ([HHb]) as indices of VO2m and C(a - v)O2 (arterio-venous oxygen difference) kinetics, respectively. VO2p (l min-1) was measured breath by breath and [HHb] (microm) was measured by near infrared spectroscopy during moderate (M; below lactate threshold, LT) and heavy exercise (H, above LT) in nine subjects. The kinetics of Qcap were biphasic, with an initial fast phase (tauI; M=9.3+/-4.9 s and H=6.0+/-3.8 s) followed by a slower phase 2 (tauP; M=29.9+/-8.6 s and H=47.7+/-26.0 s). For moderate exercise, the overall kinetics of Qcap (mean response time [MRT], 36.1+/-8.6 s) were significantly slower than the kinetics of VO2p (tauP; 27.8+/-5.3 s) and [HHb] (MRT for [HHb]; 16.2+/-6.3 s). However, for heavy exercise, there was no significant difference between MRT-[HHb] (34.7+/-10.4 s) and tauP for VO2p (32.3+/-6.7 s), while MRT for Qcap (48.7+/-21.8 s) was significantly slower than MRT for [HHb] and tauP for VO2p. In conclusion, during recovery from exercise the estimated Qcap kinetics were biphasic, showing an early rapid decrease in blood flow. In addition, the overall kinetics of Qcap were slower than the estimated VO2m kinetics. |
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Authors:
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Leonardo F Ferreira; Allison J Harper; Dana K Townsend; Barbara J Lutjemeier; Thomas J Barstow |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2005-05-20 |
Journal Detail:
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Title: Experimental physiology Volume: 90 ISSN: 0958-0670 ISO Abbreviation: Exp. Physiol. Publication Date: 2005 Sep |
Date Detail:
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Created Date: 2005-09-22 Completed Date: 2005-11-01 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9002940 Medline TA: Exp Physiol Country: England |
Other Details:
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Languages: eng Pagination: 715-26 Citation Subset: IM |
Affiliation:
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Department of Anatomy and Physiology, Kansas State University, Manhattan, KA 66506-0302, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Flow Velocity Capillaries / physiology* Exercise / physiology* Exercise Test Female Hemoglobins / metabolism Humans Kinetics Male Muscle, Skeletal / blood supply* Oxygen Consumption / physiology Regional Blood Flow* |
| Chemical | |
Reg. No./Substance:
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0/Hemoglobins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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