Institute of Interdisciplinary Exercise Science and Sports Medicine, MSH Medical School Hamburg, Hamburg, Germany.
G-Lab, Faculty of Applied Sport Sciences and Personality, BSP Business and Law School, Berlin, Germany.
Eur J Sport Sci. 2024 Nov;24(11):1539-1551. doi: 10.1002/ejsc.12175. Epub 2024 Sep 19.
The study explores the validity of the nonlinear index alpha 1 of detrended fluctuation analysis (DFAa1) of heart rate (HR) variability for exercise prescription in prolonged constant load running bouts of different intensities. 21 trained endurance athletes (9 w and 12 m) performed a ramp test for ventilatory threshold (vVT1 and vVT2) and DFAa1-based (vDFAa1-1 at 0.75 and vDFAa1-2 at 0.5) running speed detection as well as two 20-min running bouts at vDFAa1-1 and vDFAa1-2 (20-vDFAa1-1 and 20-vDFAa1-2), in which HR, oxygen consumption (VO), respiratory frequency (RF), DFAa1, and blood lactate concentration [La-] were assessed. 20-vDFAa1-2 could not be finished by all participants (finisher group (FG), n = 15 versus exhaustion group (EG), n = 6). Despite similar mean external loads of vDFAa1-1 (10.6 ± 1.9 km/h) and vDFAa1-2 (13.1 ± 2.4 km/h) for all participants compared to vVT1 (10.8 ± 1.7 km/h) and vVT2 (13.2 ± 1.9 km/h), considerable differences were present for 20-vDFAa1-2 in EG (15.2 ± 2.4 km/h). 20-vDFAa1-1 and 20-DFAa1-2 yielded significant differences in FG for HR (76.2 ± 5.7 vs. 86.4 ± 5.9 %HR), VO (62.1 ± 5.0 vs. 77.5 ± 8.6 %VO), RF (40.6 ± 11.3 vs. 46.1 ± 9.8 bpm), DFA-a1 (0.86 ± 0.23 vs. 0.60 ± 0.15), and [La-] (1.41 ± 0.45 vs. 3.34 ± 2.24 mmol/L). Regarding alterations during 20-vDFAa1-1, all parameters showed small changes for all participants, while during 20-vDFAa1-2 RF and DFAa1 showed substantial alterations in FG (RF: 15.6% and DFAa1: -12.8%) and more pronounced in EG (RF: 20.1% and DFAa1: -35.9%). DFAa1-based exercise prescription from incremental testing could be useful for most participants in prolonged running bouts, at least in the moderate to heavy intensity domain. In addition, an individually different increased risk of overloading may occur in the heavy to severe exercise domains and should be further elucidated in the light of durability and decoupling assessment.
该研究探讨了心率（HR）变异性去趋势波动分析（DFAa1）的非线性指标 alpha 1 在不同强度的长时间恒负荷跑步中的运动处方中的有效性。21 名训练有素的耐力运动员（9 名女性和 12 名男性）进行了呼吸阈（vVT1 和 vVT2）和基于 DFAa1 的（vDFAa1-1 在 0.75 和 vDFAa1-2 在 0.5）跑步速度检测的斜坡测试，以及在 vDFAa1-1 和 vDFAa1-2 进行了两次 20 分钟的跑步（20-vDFAa1-1 和 20-vDFAa1-2），在此期间评估了 HR、耗氧量（VO）、呼吸频率（RF）、DFAa1 和血乳酸浓度 [La-]。并非所有参与者都能完成 20-vDFAa1-2（完成组（FG），n=15 与精疲力竭组（EG），n=6）。尽管所有参与者的平均外部负荷（vDFAa1-1 为 10.6±1.9km/h 和 vDFAa1-2 为 13.1±2.4km/h）与 vVT1（10.8±1.7km/h）和 vVT2（13.2±1.9km/h）相似，但 EG 中的 20-vDFAa1-2 存在相当大的差异（15.2±2.4km/h）。20-vDFAa1-1 和 20-DFAa1-2 在 FG 中 HR（76.2±5.7%HR 与 86.4±5.9%HR）、VO（62.1±5.0%VO 与 77.5±8.6%VO）、RF（40.6±11.3bpm 与 46.1±9.8bpm）、DFA-a1（0.86±0.23 与 0.60±0.15）和 [La-]（1.41±0.45mmol/L 与 3.34±2.24mmol/L）存在显著差异。关于 20-vDFAa1-1 期间的变化，所有参数在所有参与者中均显示出较小的变化，而在 20-vDFAa1-2 期间，RF 和 DFAa1 在 FG 中显示出明显的变化（RF：15.6%和 DFAa1：-12.8%），在 EG 中更为明显（RF：20.1%和 DFAa1：-35.9%）。从递增测试中进行的基于 DFAa1 的运动处方可能对大多数参与者在长时间跑步中有用，至少在中等到高强度范围内。此外，在重到剧烈运动的范围内，可能会出现个体不同的过度负荷风险增加，应根据耐久性和去耦评估进一步阐明。
