Key result
In professional soccer players, the maximal relative O2 pulse remained stable during repeated cardiopulmonary exercise testing within a 1-year period (32.9 vs 32.6 mL O2/beat/kg; P > 0.05).
Why the study?
Does the relative O2 pulse curve remain stable during repeated maximal cardiopulmonary exercise testing in professional soccer players?
Observational (n=49)
Does the relative O2 pulse curve remain stable during repeated maximal cardiopulmonary exercise testing in professional soccer players?
Absolute Event Rate: 32.6% vs 32.9%
p-value: p=> 0.05
The morphology of the relative O2 pulse curve is consistent up to close to peak effort for CPETs repeated within a 1-year period in elite athletes, suggesting its reliability for assessing stroke volume indirectly.
May support serial O2 pulse reliability in elite athletes; hypothesis-generating for other populations.
During cardiopulmonary exercise testing (CPET), stroke volume can be indirectly assessed by O(2) 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 O(2) pulse curve relative to body mass in elite athletes. VO(2), heart rate (HR), and relative O(2) 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 VO(2) (63.4 ± 0.9 vs 63.5 ± 0.9 mL O(2)•kg(-1)•min(-1)), HR (190 ± 1 vs188 ± 1 bpm) and relative O(2) pulse (32.9 ± 0.6 vs 32.6 ± 0.6 mL O(2)•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 O(2) pulse increased linearly and similarly in both evaluations (r(2) = 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 O(2) pulse. In young healthy men in good to excellent aerobic condition, the morphology of the relative O(2) pulse curve is consistent up to close to the peak effort for a CPET repeated within a 1-year period. No increase in relative O(2)pulse 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 cardiopulmonary exercise testing 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 during repeated cardiopulmonary exercise testing within a 1-year period (32.9 vs 32.6 mL O2/beat/kg; P > 0.05).
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