To build a high-quality training process, it is necessary to have information about the metabolic thresholds of energy supply during physical activity. The optimal way to obtain this information is through the method of step-by-step load testing with capillary blood sampling for lactate concentration analysis. In an attempt to move away from the invasive method, alternative methods are being sought to determine the metabolic limits of exercise intensity, and one such method is the analysis of the DFAa1 index, a short-term indicator of the fractal complexity of the R-R interval between heartbeats. This paper examines the practical applicability of this method in the training of athletes. It compares the physiological thresholds of energy supply during physical activity obtained through the invasive method of step-by-step load testing with capillary blood sampling and the method of analyzing the DFAa1 index.
Autors:
Bikmetov A. V., Zavarukhina S. A.
Keywords:
#aerobic and anaerobic physiological thresholds of energy supply during physical exertion
#DFAa1 index
#Dmod method
#lactate curve
#lactate curve function
#LT1
#LT2
List of literature:
- Bikmetov, A. V. Fraktal`ny`e korrelyacionny`e svojstva variabel`nosti serdechnogo ritma ‒ kak biomarker dlya opredeleniya fiziologicheskix porogov e`nergoobespecheniya pri fizicheskix nagruzkax / A. V. Bikmetov // Fizicheskaya kul`tura, sport, turizm: nauka, obrazovanie, texnologii: materialy` XIII Vserossijskoj s mezhdunarodny`m uchastiem nauchno-prakticheskoj konferencii magistrantov i molody`x ucheny`x, posvyashhennoj 55-letiyu FGBOU VO «UralGUFK» / Otvetstvenny`e redaktory` N. Yu. Mishhenko, E. V. By`kov. ‒ Chelyabinsk: UralGUFK, 2025. – 708 s.
- Borovikov, V. P. Populyarnoe vvedenie v sovremenny`j analiz danny`x v sisteme STATISTICA: ucheb. posobie dlya vuzov / V. P. Borovikov. ‒ Moskva: RiS, 2015. ‒ 288 c.
- Zavaruxina, S. A. Opredelenie fiziologicheskix porogov e`nergoobespecheniya metodom Dmod analiza stepennoj funkcii laktatnoj krivoj, poluchennoj v stupenchatom nagruzochnom teste / S. A. Zavaruxina, A. V. Bikmetov // Nauchno-sportivny`j zhurnal. – 2025. – T. 3, № 4. – S. 111‒120.
- Orlov, A. I. Prikladnaya statistika: uchebnik / A. I. Orlov – Moskva: Izdatel`stvo «E`kzamen», 2004. ‒ 656 s.
- Ry`bina, I. L. Laboratorny`e markery` kontrolya i upravleniya trenirovochny`m processom sportsmenov: nauka i praktika: monografiya / I. L. Ry`bina, L. M. Gunina; pod obshhej redakciej L. M. Guninoj. ‒ Moskva: Sport, 2021. ‒ 376 s.
- Spirin, T. S. Optimal`ny`j metod opredeleniya vtorogo laktatnogo (anae`robnogo) poroga v ciklicheskix vidax sporta / T. S. Spirin, A. I. Chikurov, S. V. Radaeva // Vestnik Tomskogo gosudarstvennogo universiteta. ‒ 2023. ‒ № 489. ‒ S. 193‒200.
- Goldberger A.L. et al. Fractal dynamics in physiology: alterations with disease and aging // Proceedings of the National Academy of Sciences. ‒ 2002. ‒ Vol. 99, suppl 1. ‒
P. 2466‒2472. - Hoenig, J. M. The Abuse of Power: The Pervasive Fallacy of Power Calculations for Data Analysis / J. M. Hoenig, D. M. Heisey // The American Statistician. ‒ 2001. ‒ Vol. 55, №1. ‒ P.19‒24. DOI: 10.1198/000313001300339897.
- Levine, M. Post Hoc Power Analysis: An Idea Whose Time Has Passed? / M. Levine, M. H. Ensom // Pharmacotherapy. ‒ 2001. ‒ Vol. 21, №4. ‒ P.405‒409. DOI: 10.1592/phco.21.5.405.34503.
- Rogers, B. Fractal Correlation Properties of Heart Rate Variability as a Biomarker for Intensity Distribution and Training Prescription in Endurance Exercise: An Update / B. Rogers, T. Gronwald // Front. Physiol. ‒ 2022. ‒ №13.
- Zwingmann, L. Modifications of the Dmax method in comparison to the MLSS in young male athletes / L. Zwingmann // The Physician and Sportsmedicine. ‒ 2019 ‒ 2 (47). ‒ pp. 174‒181. DOI: 10.1080/00913847.2018.1546103.
More about the authors:
Andrey V. Bikmetov ‒ student Ural State University of Physical Culture. Chelyabinsk. Russia. 454091, Russia, Chelyabinsk, Ordzhonikidze str., 1. e-mail: andreyq76@gmail.com
Svetlana A. Zavarukhina ‒ Candidate of Biological Sciences, Associate Professor, Associate Professor of the Department of Biochemistry of the Ural State University of Physical Culture. Chelyabinsk. Russia. 454091, Russia, Chelyabinsk, Ordzhonikidze str., 1. e-mail: svezava@yandex.ru