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Experimental Physiology 90.5 pp 715-726
DOI: 10.1113/expphysiol.2005.030189
© The Physiological Society 2005
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Kinetics of estimated human muscle capillary blood flow during recovery from exercise

Leonardo F Ferreira1, Allison J Harper2, Dana K Townsend1, Barbara J Lutjemeier1 and Thomas J Barstow2

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

The kinetic characteristics of muscle capillary blood flow {eph_162_mu1} during recovery from exercise are controversial (e.g. one versus two phases). Furthermore, it is not clear how the overall {eph_162_mu2} kinetics are temporally associated with muscle oxygen uptake {eph_162_mu3} kinetics. To address these issues, we examined the kinetics of {eph_162_mu4} estimated from the rearrangement of the Fick equation {eph_162_mu5} using the kinetics of pulmonary {eph_162_mu6} ({eph_162_mu7}, primary component) and deoxy-haemoglobin concentration ([HHb]) as indices of {eph_162_mu8} and C(a – v)O2 (arterio-venous oxygen difference) kinetics, respectively. {eph_162_mu9} (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 {eph_162_mu10} were biphasic, with an initial fast phase ({tau}I; M = 9.3 ± 4.9 s and H = 6.0 ± 3.8 s) followed by a slower phase 2 ({tau}P; M = 29.9 ± 8.6 s and H = 47.7 ± 26.0 s). For moderate exercise, the overall kinetics of {eph_162_mu11} (mean response time [MRT], 36.1 ± 8.6 s) were significantly slower than the kinetics of {eph_162_mu12} ({tau}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 {tau}P for {eph_162_mu13} (32.3 ± 6.7 s), while MRT for {eph_162_mu14} (48.7 ± 21.8 s) was significantly slower than MRT for [HHb] and {tau}P for {eph_162_mu15}. In conclusion, during recovery from exercise the estimated {eph_162_mu16} kinetics were biphasic, showing an early rapid decrease in blood flow. In addition, the overall kinetics of {eph_162_mu17} were slower than the estimated {eph_162_mu18} 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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