Programa de Pós-Graduação em Educação Física, Universidade Gama Filho, Rio de Janeiro, Brasil.
Braz J Med Biol Res. 2011 Jul;44(7):700-6. doi: 10.1590/s0100-879x2011007500073. Epub 2011 Jun 1.
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.
在心肺运动测试（CPET）中，可以通过 O(2)脉冲轮廓间接评估每搏输出量。然而，为了进行有效的解释，应该了解该变量随时间的稳定性。本研究旨在分析优秀运动员中，与体重相关的 O(2)脉冲曲线的稳定性。对 49 名足球运动员的 2 次最大 CPET 中，每隔 10%的跑步时间进行 VO(2)、心率（HR）和相对 O(2)脉冲的比较，这 2 次 CPET 的时间分别为 2005 年至 2010 年。最大 VO(2)（63.4±0.9 与 63.5±0.9 mL O(2)•kg(-1)•min(-1)）、HR（190±1 与 188±1 bpm）和相对 O(2)脉冲（32.9±0.6 与 32.6±0.6 mL O(2)•beat(-1)•kg(-1)）在 2 次 CPET 中相似（P>0.05），而跑步机的最终速度从 18.5±0.9 增加到 18.9±1.0 km/h（P<0.01）。相对 O(2)脉冲在两次评估中呈线性且相似地增加（r(2)=0.64 和 0.63），直至跑步时间的 90%。在跑步时间的 90%至 100%之间，数值的稳定性较差，多达 50%的运动员出现相对 O(2)脉冲趋于平台的趋势。在处于良好至优秀有氧条件的年轻健康男性中，相对 O(2)脉冲曲线的形态在接近 CPET 的峰值努力时是一致的。在这些运动员中，在峰值努力时相对 O(2)脉冲没有增加可能代表生理性的每搏输出量限制。
