Muscle Oxygenation during Incremental Arm and Leg Exercise in Professional Rugby Union Players Silvia Pogliaghi, Gabriela De Roia. Faculty of Motor Sciences, University of Verona, Italy PURPOSE: The study was aimed to compare modifications of muscle oxygenation during arm and leg incremental exercise in rugby players. METHODS: 22 male players from a single professional team of the Italian senior A championship (25 ± 5 years; body mass 89 ± 14 Kg; high 177 ± 6 cm; Body fat 15 ± 7 %) performed incremental exercises to exhaustion on arm crank (ARM) and cycle ergometer (CYC). Ventilation, gas exchange and heart rate (HR) were measured breath by breath with a metabolic chart. Changes in concentration of deoxygenaed hemoglobin ([deoxyHb], an index of the ratio between O2 utilization and O2 delivery, that is conceptually similar to O2 extraction, were monitored non-invasively by near infrared spectroscopy at the vastus lateralis (for CYC) and at the biceps brachii (for ARM) and data were expressed as % of the values obtained during limb ischemia. Submaximal and maximal values were calculated as an average of the last 10s of each work load and upon exhaustion and data were compared by paired t test. RESULTS: VO2 increased as a function of power output (W), with a significantly higher slope in ARM test compared to CYC test. Oxygen pulse (O2p) and O2 extraction also increased as a function of workload in both ARM and CYC tests. At equal submaximal levels of VO2, O2p was significantly lower and O2 extraction was significantly higher in ARM compared to CYC exercise. Upon exhaustion maximal values of HR (overall average 176 ± 14 b*min-1) and respiratory quotient (1,11 ± 0,07) were reached, with no significant differences between testing modalities. Significantly higher values of maximal power W (172 ± 13 watt vs 263 ± 21) and VO2 (36 ± 6 ml*kg-1*min-1 vs 46 ± 6) were reached in CYC vs ARM, ARM VO2max representing 799% of CYC value. Maximal O2p was lower (18 ± 3 ml*b-1 vs 23 ± 3) and O2 extraction was significantly higher (81 8 % of ischemia vs 70 19%) in ARM compared to CYC exercise. CONCLUSION: Our data suggest, at both maximal and submaximal exercise intensity, a higher O2 extraction compared to O2 delivery in ARM vs CYC exercise in rugby players.
Muscle oxygenation during incremental arm and leg exercise in professional rugby union players
POGLIAGHI, Silvia;DE ROIA, Gabriela Fernanda
2007-01-01
Abstract
Muscle Oxygenation during Incremental Arm and Leg Exercise in Professional Rugby Union Players Silvia Pogliaghi, Gabriela De Roia. Faculty of Motor Sciences, University of Verona, Italy PURPOSE: The study was aimed to compare modifications of muscle oxygenation during arm and leg incremental exercise in rugby players. METHODS: 22 male players from a single professional team of the Italian senior A championship (25 ± 5 years; body mass 89 ± 14 Kg; high 177 ± 6 cm; Body fat 15 ± 7 %) performed incremental exercises to exhaustion on arm crank (ARM) and cycle ergometer (CYC). Ventilation, gas exchange and heart rate (HR) were measured breath by breath with a metabolic chart. Changes in concentration of deoxygenaed hemoglobin ([deoxyHb], an index of the ratio between O2 utilization and O2 delivery, that is conceptually similar to O2 extraction, were monitored non-invasively by near infrared spectroscopy at the vastus lateralis (for CYC) and at the biceps brachii (for ARM) and data were expressed as % of the values obtained during limb ischemia. Submaximal and maximal values were calculated as an average of the last 10s of each work load and upon exhaustion and data were compared by paired t test. RESULTS: VO2 increased as a function of power output (W), with a significantly higher slope in ARM test compared to CYC test. Oxygen pulse (O2p) and O2 extraction also increased as a function of workload in both ARM and CYC tests. At equal submaximal levels of VO2, O2p was significantly lower and O2 extraction was significantly higher in ARM compared to CYC exercise. Upon exhaustion maximal values of HR (overall average 176 ± 14 b*min-1) and respiratory quotient (1,11 ± 0,07) were reached, with no significant differences between testing modalities. Significantly higher values of maximal power W (172 ± 13 watt vs 263 ± 21) and VO2 (36 ± 6 ml*kg-1*min-1 vs 46 ± 6) were reached in CYC vs ARM, ARM VO2max representing 799% of CYC value. Maximal O2p was lower (18 ± 3 ml*b-1 vs 23 ± 3) and O2 extraction was significantly higher (81 8 % of ischemia vs 70 19%) in ARM compared to CYC exercise. CONCLUSION: Our data suggest, at both maximal and submaximal exercise intensity, a higher O2 extraction compared to O2 delivery in ARM vs CYC exercise in rugby players.
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