Iyriboz Y, Powers S, Morrow J, Ayers D, Landry G
Exercise Physiology Laboratory, Louisiana State University, Baton Rouge.
Br J Sports Med. 1991 Sep;25(3):162-4. doi: 10.1136/bjsm.25.3.162.
Pulse oximeters are being widely used for non-invasive, simultaneous assessment of haemoglobin oxygen saturation. They are reliable, accurate, relatively inexpensive and portable. Pulse oximeters are often used for estimating heart rate at rest and during exercise. However, at present the data available to validate their use as heart rate monitors are not sufficient. We evaluated the accuracy of two oximeters (Radiometer, ear and finger probe; Ohmeda 3700, ear probe) in monitoring heart rate during incremental exercise by comparing the pulse oximeters with simultaneous ECG readings. Data were collected on eight men (713 heart rate readings) during graded cycle ergometer and treadmill exercise to volitional fatigue. Analysis by linear regression revealed that general oximeter readings significantly correlated with those of ECG (r = 0.91, P less than 0.0001). However, comparison of heart rate at each level of work showed that oximeter readings significantly (P less than 0.05) under-estimated rates above 155 beats/min. These results indicate that the use of pulse oximeters as heart rate monitors during strenuous exercise is questionable. This inaccuracy may well originate from the instability of the probes, sweating, other artefacts during exercise, and measurement of different components in the cardiovascular cycle.
脉搏血氧仪正被广泛用于对血红蛋白氧饱和度进行无创、同步评估。它们可靠、准确、相对便宜且便于携带。脉搏血氧仪常用于估计静息和运动时的心率。然而，目前可用于验证其作为心率监测器用途的数据并不充分。我们通过将脉搏血氧仪与同步心电图读数进行比较，评估了两种血氧仪（Radiometer，耳部和手指探头；Ohmeda 3700，耳部探头）在递增运动期间监测心率的准确性。在分级自行车测力计和跑步机运动至自愿疲劳期间，收集了8名男性的713次心率读数数据。线性回归分析显示，一般血氧仪读数与心电图读数显著相关（r = 0.91，P < 0.0001）。然而，对每个工作水平的心率比较表明，血氧仪读数在心率高于155次/分钟时显著（P < 0.05）低估了心率。这些结果表明，在剧烈运动期间将脉搏血氧仪用作心率监测器存在疑问。这种不准确性很可能源于探头的不稳定性、出汗、运动期间的其他伪像以及心血管周期中不同成分的测量。
