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This Article Full Text Full Text (PDF) All Versions of this Article: 90/5/715    most recent expphysiol.2005.030189v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Ferreira, L. F Articles by Barstow, T. J Search for Related Content PubMed PubMed Citation Articles by Ferreira, L. F Articles by Barstow, T. J Related Collections Human, Environmental & Exercise

Departments of ¹ Anatomy and Physiology² Kinesiology, Kansas State University, Manhattan, KA 66506-0302, USA

The kinetic characteristics of muscle capillary blood flow during recovery from exercise are controversial (e.g. one versus two phases). Furthermore, it is not clear how the overall kinetics are temporally associated with muscle oxygen uptake kinetics. To address these issues, we examined the kinetics of estimated from the rearrangement of the Fick equation using the kinetics of pulmonary (, primary component) and deoxy-haemoglobin concentration ([HHb]) as indices of and C_{(a – v)O2} (arterio-venous oxygen difference) kinetics, respectively. (l min^–1) was measured breath by breath and [HHb] (µm) 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 were biphasic, with an initial fast phase (_I; M = 9.3 ± 4.9 s and H = 6.0 ± 3.8 s) followed by a slower phase 2 (_P; M = 29.9 ± 8.6 s and H = 47.7 ± 26.0 s). For moderate exercise, the overall kinetics of (mean response time [MRT], 36.1 ± 8.6 s) were significantly slower than the kinetics of (_P; 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 _P for (32.3 ± 6.7 s), while MRT for (48.7 ± 21.8 s) was significantly slower than MRT for [HHb] and _P for . In conclusion, during recovery from exercise the estimated kinetics were biphasic, showing an early rapid decrease in blood flow. In addition, the overall kinetics of were slower than the estimated kinetics.

(Received 31 January 2005; accepted after revision 18 May 2005; first published online 20 May 2005)
Corresponding author T. J. Barstow: Department of Kinesiology, 1A Natatorium, Kansas State University, Manhattan, KA 66506-0302, USA. Email: tbarsto{at}ksu.edu

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