Alterations in aerobic fitness and muscle deoxygenation during ramp incremental exercise in trained youth cyclists: a ~3-year longitudinal study

Hovorka, Matthias; Simon, Dieter; Leo, Peter; Prinz, Bernhard; Nimmerichter, Alfred

doi:10.1080/02640414.2023.2200565

Cited by 2 publications

(1 citation statement)

References 60 publications

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“…SmO 2 data has been suggested as a reliable for detecting thresholds because it shows a continuous decline during graded cycling test (GXT) with a change in slope near the second lactate threshold (van der Zwaard et al 2016, Cayot et al 2021, Hovorka et al 2023. However, there is a lack of knowledge about the best mathematical method for determining the first and second SmO 2 thresholds (MOT1 and MOT2, respectively).…”

Section: Introductionmentioning

confidence: 99%

A comparative analysis of mathematical methods for detecting lactate thresholds using muscle oxygenation data during a graded cycling test

Sendra-Pérez,

Encarnación-Martínez,

Oficial-Casado

et al. 2023

Physiol. Meas.

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Threshold determination for improving training and sports performance is important for researchers and trainers, who currently use different methods for determining lactate, ventilatory or muscle oxygenation (SmO2) thresholds. Our study aimed to compare the identification of the intensity at the first and second thresholds using lactate and SmO2 data by different mathematical methods in different muscles during a graded cycling test. Twenty-six cyclists (15 males and 11 females; 23 ±6 years, 1.71 ±0.09 m, 64.3 8.8 Kg and 12 3 training hours per week) performed a graded test on the cycle ergometer. Power output and saturation of muscle oxygen in four muscles (vastus lateralis, biceps femoris, gastrocnemius and tibialis anterior) were measured, along with systemic lactate concentration. Our results showed that any method was reliable for determining the first muscle oxygenation threshold (MOT1) when comparing the lactate threshold in any muscle. However, the best method for determining the second muscle oxygenation threshold (MOT2) was the Exp-Dmax (p < 0.01; ICC=0.79-0.91) in all muscles. In particular, the vastus lateralis muscle showed the highest intraclass correlation coefficient (ICC=0.91, CI95%[0.81, 0.96]). However, results varied per sex across all muscles analyzed. In conclusion, although the first muscle oxygenation threshold could not be determined using mathematical methods in all the muscles analyzed, the Exp-Dmax method presented excellent results in detecting the second systemic threshold in the vastus lateralis.

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Section: Introductionmentioning

confidence: 99%

A comparative analysis of mathematical methods for detecting lactate thresholds using muscle oxygenation data during a graded cycling test

Sendra-Pérez,

Encarnación-Martínez,

Oficial-Casado

et al. 2023

Physiol. Meas.

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Long-Term Alterations in Pulmonary V˙O2 and Muscle Deoxygenation On-Kinetics During Heavy-Intensity Exercise in Competitive Youth Cyclists: A Cohort Study

Hovorka,

Prinz,

Simon

et al. 2024

Pediatric Exercise Science

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Purpose: The aim of this investigation was to assess alterations of pulmonary oxygen uptake () and muscle deoxygenation on-kinetics during heavy-intensity cycling in youth cyclists over a period of 15 months. Methods: Eleven cyclists (initial age, 14.3 [1.6] y; peak , 62.2 [4.5] mL·min−1·kg−1) visited the laboratory twice on 3 occasions within 15 months. Participants performed an incremental ramp exercise test and a constant workrate test within the heavy-intensity domain during the first visit and second visit, respectively. Subsequently, parameter estimates of the and muscle deoxygenation on-kinetics were determined with mono-exponential models. Results: The phase II time constant decreased from occasion 1 (34 [4] s) to occasion 2 (30 [4] s, P = .005) and 3 (28 [4] s, P = .010). However, no significant alteration was observed between occasions 2 and 3 (P = .565). The slow component amplitude either expressed in absolute values (ie, L·min−1) or relative to end exercise (ie, %) showed no significant changes throughout the study (P = .972 and .996). Furthermore, the muscle deoxygenation on-kinetic mean response time showed no significant changes throughout the study (18 [8], 18 [3], and 16 [5] s for occasions 1, 2, and 3, respectively; P = .279). Conclusion: These results indicate proportional enhancements of local muscle oxygen distribution and utilization, which both contributed to the speeding of the on-kinetics herein.

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Alterations in aerobic fitness and muscle deoxygenation during ramp incremental exercise in trained youth cyclists: a ~3-year longitudinal study

Cited by 2 publications

References 60 publications

A comparative analysis of mathematical methods for detecting lactate thresholds using muscle oxygenation data during a graded cycling test

A comparative analysis of mathematical methods for detecting lactate thresholds using muscle oxygenation data during a graded cycling test

Long-Term Alterations in Pulmonary V˙O2 and Muscle Deoxygenation On-Kinetics During Heavy-Intensity Exercise in Competitive Youth Cyclists: A Cohort Study

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