Rogers Bruce, Murias Juan M, Fleitas-Paniagua Pablo R
College of Medicine, University of Central Florida, Orlando, Florida.
College of Health and Life Sciences, Hamad Bin Khalifa University, Doha, Qatar; and.
J Strength Cond Res. 2025 Jul 9. doi: 10.1519/JSC.0000000000005196.
Rogers, B, Murias, JM, and Fleitas-Paniagua, PR. Prediction of the maximal metabolic steady state from heart rate variability using a submaximal incremental ramp test. J Strength Cond Res XX(X): 000-000, 2025-Recent studies have demonstrated that the metabolic rate at the heavy-severe exercise intensity boundary can be determined by identifying the respiratory compensation point (RCP) and the second heart rate variability threshold (HRVT2) from incremental ramp testing. This study examined whether the HRVT2 could be extrapolated from submaximal portions of the incremental test. Fifteen subjects (5 men, 10 women, age 23 ± 4 years, V̇o2max 42.6 ± 8.0 ml·kg-1·min-1) underwent incremental cycling ramp testing measuring gas exchange variables along with an open-source application recording detrended fluctuation analysis (DFA a1) and RR intervals. RR data from ramp start to the point at which DFA a1 reached 0.75 were used for HRVT2 extrapolation. Comparisons were made between the V̇o2 and HR at the RCP and HRVT2. Mean values for RCP vs. HRVT2 V̇o2 and HR were not statistically different, 39.0 ± 9.7 vs. 38.8 ± 11.1 ml·kg-1·min-1 and 168 ± 9 vs. 168 ± 12 bpm, respectively, with equivalence verified. Pearson's r correlation coefficients were 0.92 and 0.60 for RCP vs. HRVT2 V̇o2 and HR, respectively. Bland-Altman analysis showed negligible bias of 0.2 ml·kg-1·min-1 (LOA ±9.0) for V̇o2 and +1 bpm (LOA ±20 bpm) for HR. DFA a1 at the RR interval testing limit was 0.72 ± 0.04 with an HR of 163 ± 12. In this group of healthy recreationally active subjects, the HRVT2 V̇o2 and HR extrapolated from submaximal portions of the incremental test maintained similar agreement and equivalence to the V̇o2 and HR at the RCP as seen in prior studies using testing to exhaustion.
罗杰斯、B、穆里亚斯、JM和弗莱塔斯-帕尼亚瓜、PR。使用次最大递增斜坡试验从心率变异性预测最大代谢稳态。《力量与体能研究杂志》XX(X): 000 - 000，2025年。最近的研究表明，通过在递增斜坡试验中识别呼吸补偿点（RCP）和第二心率变异性阈值（HRVT2），可以确定重度-极重度运动强度边界处的代谢率。本研究考察了是否可以从递增试验的次最大部分推断出HRVT2。15名受试者（5名男性，10名女性，年龄23±4岁，最大摄氧量42.6±8.0 ml·kg-1·min-1）进行了递增自行车斜坡试验，测量气体交换变量，并使用开源应用程序记录去趋势波动分析（DFA a1）和RR间期。从斜坡开始到DFA a1达到0.75的点的RR数据用于HRVT2推断。对RCP和HRVT2时的摄氧量和心率进行了比较。RCP与HRVT2时的摄氧量和心率的平均值在统计学上无差异，分别为39.0±9.7与38.8±11.1 ml·kg-1·min-1和168±9与168±12次/分钟，验证了等效性。RCP与HRVT2时的摄氧量和心率的皮尔逊r相关系数分别为0.92和0.60。布兰德-奥特曼分析显示，摄氧量的偏差可忽略不计，为0.2 ml·kg-1·min-1（一致性界限±9.0），心率的偏差为+1次/分钟（一致性界限±20次/分钟）。RR间期测试极限处的DFA a1为0.72±0.04，心率为163±12。在这组健康的休闲活跃受试者中，从递增试验的次最大部分推断出的HRVT2时的摄氧量和心率与先前使用力竭试验的研究中RCP时的摄氧量和心率保持相似的一致性和等效性。
