Modeling Oxygen Dynamics under Variable Work Rate
Modeling Oxygen Dynamics under Variable Work Rate
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可变工作率下的氧气动力学建模
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
D. Saupe
中科院分区：
文献类型：
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作者：
Alexander Artiga Gonzalez;Raphael Bertschinger;Fabian Brosda;Thorsten Dahmen;Patrick Thumm;D. Saupe
摄氧量和血乳酸含量的测量是评估运动员身体素质和耐力能力的核心方法。从增量运动试验的这些数据中提取的两个重要参数是最大摄氧量和临界功率。在恒定工作速率下的运动期间的氧摄取的动力学的普遍接受的模型包括恒定基线氧摄取、指数快速分量和用于重和剧烈工作速率的另一指数缓慢分量。我们推广这个模型的可变负载协议的微分方程，自然对应于标准模型的恒定工作速率。这提供了用于预测对可变负荷曲线（包括恢复阶段）的氧摄取响应的手段。从自行车测力计测试的个体受试者的模型参数进行了拟合。通过在单独测试中收集的数据验证了模型预测。我们的研究结果表明，可变运动负荷的氧动力学可以使用广义的数学标准模型进行预测，但是，高估了缓慢的组成部分。这种模型允许在恒定工作速率假设通常无效的领域中应用。
Measurements of oxygen uptake and blood lactate content are central to methods for assessment of physical fitness and endurance capabilities in athletes. Two important parameters extracted from such data of incremental exercise tests are the maximal oxygen uptake and the critical power. A commonly accepted model of the dynamics of oxygen uptake during exercise at constant work rate comprises a constant baseline oxygen uptake, an exponential fast component, and another exponential slow component for heavy and severe work rates. We generalized this model to variable load protocols by differential equations that naturally correspond to the standard model for constant work rate. This provides the means for prediction of oxygen uptake response to variable load profiles including phases of recovery. The model parameters were fitted for individual subjects from a cycle ergometer test. The model predictions were validated by data collected in separate tests. Our findings indicate that oxygen kinetics for variable exercise load can be predicted using the generalized mathematical standard model, however, with an overestimation of the slow component. Such models allow for applications in the field where the constant work rate assumption generally is not valid.