The validity of Keiser-M3 stationary bicycle with standard ergometer for physiological measurements associated with maximum effort

Abstract Aim: This study aims to investigate the concordance between two cycle ergometers for variables measured in the test of maximum incremental effort. Methods: This correlation study enrolled 15 inactive women (19,2 ± 4,0 years old). At random, the participants performed two maximal effort incremental tests (MEIT), using cycle ergometers (Keiser-M3 and Ergo-167) on different days with a minimum interval of 72 hours. The test had stages of two minutes, and two-step increments were carried out at the end of each stage. Lactate concentration ([LAC]), and rated perceived exertion (RPE) were collected, in addition to monitoring oxygen uptake (VO2) and heart rate (HR). The Paired t-test was carried out to compare physiologic variables, Lin's test was used for correlation, and Bland Altman was used to measuring concordances among variables. Results: The correlations between physiologic parameters were considered strong for HR on the anaerobic threshold (Keiser M3 = 146 ± 14 bpm; Ergo-167 = 149 ± 9 bpm; r = 0.762), greater blood lactate value (Keiser M3 = 9,97 ± 2,51 mmol/L; Ergo-167 = 9.71 ± 2.56 mmol/L; r = 0.820), VO2max (Keiser M3 = 38,37 ± 6,97 mL/kg/min; Ergo-167 = 36.06 ± 8.4 mL/kg/min; r = 0,806) and HRmax (Keiser M3 = 186 ± 53 bpm; Ergo-167 = 188 ± 11 bpm; r = 0.716). Conclusion: The results show the feasibility of using the cycle ergometer Keiser, model M3, to perform the maximal effort incremental test, whereas there was high concordance in the physiologic responses in both ergometers for inactive women.

研究目的：本研究旨在探讨两台功率自行车测力计（cycle ergometer）在最大递增负荷测试中所测各项指标的一致性。
方法：本项相关性研究纳入15名非活跃女性，年龄为19.2±4.0岁。受试者于不同日期随机完成两次最大递增负荷测试（maximal effort incremental test, MEIT），分别使用Keiser-M3与Ergo-167型功率自行车测力计，两次测试的最小间隔为72小时。该测试以2分钟为一个阶段，每个阶段结束后进行两级负荷递增。本研究采集了乳酸浓度（[LAC]）与自觉劳累分级（rated perceived exertion, RPE）数据，同时监测了摄氧量（oxygen uptake, VO2）与心率（heart rate, HR）。采用配对t检验比较生理指标，Lin相关检验用于相关性分析，Bland-Altman分析用于评估各指标间的一致性。
结果：各项生理参数的相关性分析显示，无氧阈处心率（Keiser M3：146±14次/分钟；Ergo-167：149±9次/分钟；r=0.762）、最大血乳酸值（Keiser M3：9.97±2.51 mmol/L；Ergo-167：9.71±2.56 mmol/L；r=0.820）、最大摄氧量（VO2max：Keiser M3为38.37±6.97 mL/kg/min，Ergo-167为36.06±8.4 mL/kg/min；r=0.806）以及最大心率（HRmax：Keiser M3为186±53次/分钟，Ergo-167为188±11次/分钟；r=0.716）的相关性均较强。
结论：研究结果表明，针对非活跃女性群体，使用Keiser M3型功率自行车测力计开展最大递增负荷测试具备可行性，且两台测力计所测得的生理响应具有较高一致性。