Quadriceps oxygenation during isometric exercise in sailing

I. Vogiatzis, D. Tzineris, D. Athanasopoulos, O. Georgiadou, N. Geladas

Research output: Contribution to journalArticle

Abstract

The aim of the present study was to investigate why blood lactate after prolonged quadriceps contraction during hiking is only marginally increased. Eight sailors performed five 3-min hiking bouts interspersed with 5-s recovery periods. Whole body oxygen uptake, heart rate and lactate were recorded, along with continuous-wave near-infrared spectroscopy measures of quadriceps oxygenation. The time for 50% re-oxygenation was also assessed as an indication of the degree of localized oxygen delivery stress. Hiking elicited a significant (p=0.001) increase in mean (+/- SD) heart rate (124 +/- 10 beats.min(-1)) which was accompanied by a disproportionately low oxygen uptake (12 +/- 2 ml.kg(-1).min(-1)). Lactate was significantly (p=0.001) increased throughout hiking manoeuvres, though post-exercise it remained low (3.2 +/- 0.9 mmol.l(-1)). During the hiking bouts mean quadriceps oxygenation was significantly (p=0.001) reduced compared to baseline (by 33 +/- 5%), indicating an imbalance between muscle oxygen accessibility and oxygen demand. During rest intervals quadriceps oxygenation was partially restored. After the end of the final bout the time for 50% re-oxygenation was only 8 +/- 2 s, whereas recovery of quadriceps oxygenation and oxygen uptake was completed within 3 min. We conclude that the observed low lactate could be attributed to the small oxygen and energy deficits during hiking as the muscles' oxygen accessibility is presumably partially restored during the brief rest intervals.
Original languageEnglish
Pages (from-to)11-15
Number of pages5
JournalInternational Journal of Sports Medicine
Volume29
Issue number1
DOIs
Publication statusPublished - Jan 2008
Externally publishedYes

Keywords

  • tissue oxygenation
  • sailing
  • lactate concentration

Cite this

Vogiatzis, I. ; Tzineris, D. ; Athanasopoulos, D. ; Georgiadou, O. ; Geladas, N. / Quadriceps oxygenation during isometric exercise in sailing. In: International Journal of Sports Medicine. 2008 ; Vol. 29, No. 1. pp. 11-15.
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Vogiatzis, I, Tzineris, D, Athanasopoulos, D, Georgiadou, O & Geladas, N 2008, 'Quadriceps oxygenation during isometric exercise in sailing' International Journal of Sports Medicine, vol. 29, no. 1, pp. 11-15. https://doi.org/10.1055/s-2007-964993

Quadriceps oxygenation during isometric exercise in sailing. / Vogiatzis, I.; Tzineris, D.; Athanasopoulos, D.; Georgiadou, O.; Geladas, N.

In: International Journal of Sports Medicine, Vol. 29, No. 1, 01.2008, p. 11-15.

Research output: Contribution to journalArticle

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T1 - Quadriceps oxygenation during isometric exercise in sailing

AU - Vogiatzis, I.

AU - Tzineris, D.

AU - Athanasopoulos, D.

AU - Georgiadou, O.

AU - Geladas, N.

PY - 2008/1

Y1 - 2008/1

N2 - The aim of the present study was to investigate why blood lactate after prolonged quadriceps contraction during hiking is only marginally increased. Eight sailors performed five 3-min hiking bouts interspersed with 5-s recovery periods. Whole body oxygen uptake, heart rate and lactate were recorded, along with continuous-wave near-infrared spectroscopy measures of quadriceps oxygenation. The time for 50% re-oxygenation was also assessed as an indication of the degree of localized oxygen delivery stress. Hiking elicited a significant (p=0.001) increase in mean (+/- SD) heart rate (124 +/- 10 beats.min(-1)) which was accompanied by a disproportionately low oxygen uptake (12 +/- 2 ml.kg(-1).min(-1)). Lactate was significantly (p=0.001) increased throughout hiking manoeuvres, though post-exercise it remained low (3.2 +/- 0.9 mmol.l(-1)). During the hiking bouts mean quadriceps oxygenation was significantly (p=0.001) reduced compared to baseline (by 33 +/- 5%), indicating an imbalance between muscle oxygen accessibility and oxygen demand. During rest intervals quadriceps oxygenation was partially restored. After the end of the final bout the time for 50% re-oxygenation was only 8 +/- 2 s, whereas recovery of quadriceps oxygenation and oxygen uptake was completed within 3 min. We conclude that the observed low lactate could be attributed to the small oxygen and energy deficits during hiking as the muscles' oxygen accessibility is presumably partially restored during the brief rest intervals.

AB - The aim of the present study was to investigate why blood lactate after prolonged quadriceps contraction during hiking is only marginally increased. Eight sailors performed five 3-min hiking bouts interspersed with 5-s recovery periods. Whole body oxygen uptake, heart rate and lactate were recorded, along with continuous-wave near-infrared spectroscopy measures of quadriceps oxygenation. The time for 50% re-oxygenation was also assessed as an indication of the degree of localized oxygen delivery stress. Hiking elicited a significant (p=0.001) increase in mean (+/- SD) heart rate (124 +/- 10 beats.min(-1)) which was accompanied by a disproportionately low oxygen uptake (12 +/- 2 ml.kg(-1).min(-1)). Lactate was significantly (p=0.001) increased throughout hiking manoeuvres, though post-exercise it remained low (3.2 +/- 0.9 mmol.l(-1)). During the hiking bouts mean quadriceps oxygenation was significantly (p=0.001) reduced compared to baseline (by 33 +/- 5%), indicating an imbalance between muscle oxygen accessibility and oxygen demand. During rest intervals quadriceps oxygenation was partially restored. After the end of the final bout the time for 50% re-oxygenation was only 8 +/- 2 s, whereas recovery of quadriceps oxygenation and oxygen uptake was completed within 3 min. We conclude that the observed low lactate could be attributed to the small oxygen and energy deficits during hiking as the muscles' oxygen accessibility is presumably partially restored during the brief rest intervals.

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KW - sailing

KW - lactate concentration

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DO - 10.1055/s-2007-964993

M3 - Article

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JO - International Journal of Sports Medicine

JF - International Journal of Sports Medicine

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