Key result
In professional soccer players, the maximal relative O2 pulse remained stable between two cardiopulmonary exercise tests (32.9 vs 32.6 mL O2•beat-1•kg-1; P > 0.05).
Why the study?
Is the relative oxygen pulse curve stable during repeated maximal cardiopulmonary testing in professional soccer players?
Observational (n=49)
Is the relative oxygen pulse curve stable during repeated maximal cardiopulmonary testing in professional soccer players?
Absolute Event Rate: 32.6% vs 32.9%
p-value: p=> 0.05
The relative O2 pulse curve during maximal CPET is highly reproducible in elite athletes when repeated within a 1-year period, supporting its use for indirect stroke volume assessment.
Supports O2 pulse reproducibility for indirect stroke volume assessment in athletes; leaves open prospective validation before clinical adoption.
During cardiopulmonary exercise testing (CPET), stroke volume can be indirectly assessed by O2 pulse profile. However, for a valid interpretation, the stability of this variable over time should be known. The objective was to analyze the stability of the O2 pulse curve relative to body mass in elite athletes. VO2, heart rate (HR), and relative O2 pulse were compared at every 10% of the running time in two maximal CPETs, from 2005 to 2010, of 49 soccer players. Maximal values of VO2 (63.4 ± 0.9 vs 63.5 ± 0.9 mL O2•kg-1•min-1), HR (190 ± 1 vs188 ± 1 bpm) and relative O2 pulse (32.9 ± 0.6 vs 32.6 ± 0.6 mL O2•beat-1•kg-1) were similar for the two CPETs (P > 0.05), while the final treadmill velocity increased from 18.5 ± 0.9 to 18.9 ± 1.0 km/h (P < 0.01). Relative O2 pulse increased linearly and similarly in both evaluations (r² = 0.64 and 0.63) up to 90% of the running time. Between 90 and 100% of the running time, the values were less stable, with up to 50% of the players showing a tendency to a plateau in the relative O2 pulse. In young healthy men in good to excellent aerobic condition, the morphology of the relative O2 pulse curve is consistent up to close to the peak effort for a CPET repeated within a 1-year period. No increase in relative O2pulse at peak effort could represent a physiologic stroke volume limitation in these athletes.
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Perim et al. (2011) conducted an observational in Professional soccer players (n=49). Repeated maximal cardiopulmonary exercise testing vs. Initial test was evaluated on Maximal relative O2 pulse (mL O2•beat-1•kg-1) (p=> 0.05). In professional soccer players, the maximal relative O2 pulse remained stable between two cardiopulmonary exercise tests (32.9 vs 32.6 mL O2•beat-1•kg-1; P > 0.05).
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