Abstract
Purpose
To compare the acute physiological responses of three different very low-volume cycling sessions (6 × 5 s, 3 × 30 s, and 3 × 60 s) and their dependence on age and training status.
Methods
Subjects were untrained young men (mean ± SD; age 22.3 ± 4.6 years, VO2peak 42.4 ± 5.5 ml/kg/min, n = 10), older untrained men (69.9 ± 6.3 years, 26.5 ± 7.6 ml/kg/min, n = 11), and endurance-trained cyclists (26.4 ± 9.4 years, 55.4 ± 6.6 ml/kg/min, n = 10). Maximal voluntary contraction (MVC) and electrically stimulated knee extension torque, and low-frequency fatigue, as ratio of stimulation torques at 20–100 Hz (P20/100), were measured only 24 h after exercise. Serum testosterone (Te) and blood lactate concentrations were measured only 1 h after exercise.
Results
All protocols increased the blood lactate concentration and decreased MVC and P20/100 in young men, but especially young untrained men. In old untrained men, 6 × 5 s decreased P20/100 but not MVC. Te increased after 3 × 30 s and 3 × 60 s in young untrained men and after 3 × 60 s in older untrained men. The increase in Te correlated with responses of blood lactate concentration, MVC, and P20/100 only in old untrained men.
Conclusions
As little as 6 × 5 s all-out cycling induced fatigue in young and old untrained and endurance-trained cyclists. Slightly higher-volume sessions with longer intervals, however, suppressed contractile function more markedly and also transiently increased serum testosterone concentration in untrained men.
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Abbreviations
- HIIT:
-
High-intensity interval training
- HR:
-
Heart rate
- LFF:
-
Low-frequency fatigue
- MVC:
-
Maximal voluntary contraction
- SD:
-
Standard deviation
- SIT:
-
Sprint interval training
- Te:
-
Serum testosterone concentration
- VO2peak:
-
Peak oxygen uptake
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Acknowledgements
This work was supported by the Research Council of Lithuania [Grant no. SEN-08/2016].
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Venckunas T, Krusnauskas R, Snieckus A, Eimantas N, Baranauskiene N, Skurvydas A, Brazaitis M, Kamandulis S. TV, RK, AS, NE, NB, AS, MB, and SK designed the study; RK, AS, NE, NB and MB conducted the study; TV, RK, AS, NE, NB, AS, MB, and SK analysed the data; TV, RK, AS, AS and SK wrote the paper. All authors approved the final version of the manuscript.
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Communicated by Philip D. Chilibeck.
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Venckunas, T., Krusnauskas, R., Snieckus, A. et al. Acute effects of very low-volume high-intensity interval training on muscular fatigue and serum testosterone level vary according to age and training status. Eur J Appl Physiol 119, 1725–1733 (2019). https://doi.org/10.1007/s00421-019-04162-1
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DOI: https://doi.org/10.1007/s00421-019-04162-1