Eur J Appl Physiol
; 124(8): 2461-2472, 2024 Aug.
Article
en En
| MEDLINE
| ID: mdl-38555335
ABSTRACT
PURPOSE:
This study aimed to ascertain the optimal test duration to elicit the highest maximal lactate formation rate ( V Ë Lamax), whilst exploring the underpinning energetics, and identifying the optimal blood lactate sampling period.METHODS:
Fifteen trained to well-trained males (age 27 ± 6 years; peak power 1134 ± 174 W) participated in a randomised cross-over design completing three all-out sprint cycling tests of differing test durations (10, 15, and 30 s). Peak and mean power output (W and W.kg-1), oxygen uptake, and blood lactate concentrations were measured. V Ë Lamax and energetic contributions (phosphagen, glycolytic, and oxidative) were determined using these parameters.RESULTS:
The shortest test duration of 10 s elicited a significantly (p = 0.003; p < 0.001) higher V Ë Lamax (0.86 ± 0.17 mmol.L-1.s-1; 95% CI 0.802-0.974) compared with both 15 s (0.68 ± 0.18 mmol.L-1.s-1; 95% CI 0.596-0.794) and 30 s (0.45 ± 0.07 mmol.L-1.s-1; 95% CI 0.410-0.487). Differences in V Ë Lamax were associated with large effect sizes (d = 1.07, d = 3.15). We observed 81% of the PCr and 53% of the glycolytic work completed over the 30 s sprint duration was attained after 10 s. BLamaxpost were achieved at 5 ± 2 min (ttest 10 s), 6 ± 2 min (ttest 15 s), and 7 ± 2 min (ttest 30 s), respectively.CONCLUSION:
Our findings demonstrated a 10 s test duration elicited the highest V Ë Lamax. Furthermore, the 10 s test duration mitigated the influence of the oxidative metabolism during all-out cycling. The optimal sample time to determine peak blood lactate concentration following 10 s was 5 ± 2 min.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Consumo de Oxígeno
/
Ácido Láctico
Límite:
Adult
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Humans
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Male
Idioma:
En
Revista:
Eur J Appl Physiol
Asunto de la revista:
FISIOLOGIA
Año:
2024
Tipo del documento:
Article
País de afiliación:
Reino Unido