Quadriceps muscle blood flow and oxygen availability during repetitive bouts of isometric exercise in simulated sailing

Ioannis Vogiatzis, Vasileios Andrianopoulos, Zafeiris Louvaris, Evgenia Cherouveim, Stavroula Spetsioti, Maroula Vasilopoulou, Dimitrios Athanasopoulos

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

In this study, we wished to determine whether the observed reduction in quadriceps muscle oxygen availability, reported during repetitive bouts of isometric exercise in simulated sailing efforts (i.e. hiking), is because of restricted muscle blood flow. Six national-squad Laser sailors initially performed three successive 3-min hiking bouts followed by three successive 3-min cycling tests sustained at constant intensities reproducing the cardiac output recorded during each of the three hiking bouts. The blood flow index (BFI) was determined from assessment of the vastus lateralis using near-infrared spectroscopy in association with the light-absorbing tracer indocyanine green dye, while cardiac output was determined from impedance cardiography. At equivalent cardiac outputs (ranging from 10.3+/-0.5 to 14.8+/-0.86 L . min(-1)), the increase from baseline in vastus lateralis BFI across the three hiking bouts (from 1.1+/-0.2 to 3.1+/-0.6 nM . s(-1)) was lower (P = 0.036) than that seen during the three cycling bouts (from 1.1+/-0.2 to 7.2+/-1.4 nM . s(-1)) (Cohen's d: 3.80 nM . s(-1)), whereas the increase from baseline in deoxygenated haemoglobin (by similar to 17.0+/-2.9 mu M) (an index of tissue oxygen extraction) was greater (P = 0.006) during hiking than cycling (by similar to 5.3+/-2.7 mu M) (Cohen's d: 4.17 mu M). The results suggest that reduced vastus lateralis muscle oxygen availability during hiking arises from restricted muscle blood flow in the isometrically acting quadriceps muscles.
Original languageEnglish
Pages (from-to)1041-1049
Number of pages9
JournalJournal of Sports Sciences
Volume29
Issue number10
DOIs
Publication statusPublished - 2011
Externally publishedYes

Keywords

  • Sailing
  • muscle blood flow
  • near-infrared spectroscopy

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