A1 Journal article (refereed)
Durability in recreational runners : effects of 90-min low-intensity exercise on the running speed at the lactate threshold (2024)
Nuuttila, O.-P., Laatikainen-Raussi, V., Vohlakari, K., Laatikainen-Raussi, I., & Ihalainen, J. K. (2024). Durability in recreational runners : effects of 90-min low-intensity exercise on the running speed at the lactate threshold. European Journal of Applied Physiology, Early online. https://doi.org/10.1007/s00421-024-05631-y
JYU authors or editors
Publication details
All authors or editors: Nuuttila, Olli-Pekka; Laatikainen-Raussi, Vesa; Vohlakari, Krista; Laatikainen-Raussi, Iida; Ihalainen, Johanna K.
Journal or series: European Journal of Applied Physiology
ISSN: 1439-6319
eISSN: 1439-6327
Publication year: 2024
Publication date: 09/10/2024
Volume: Early online
Publisher: Springer Nature
Publication country: Germany
Publication language: English
DOI: https://doi.org/10.1007/s00421-024-05631-y
Publication open access: Openly available
Publication channel open access: Partially open access channel
Abstract
Recent studies have suggested that the capability to resist deterioration of physiological characteristics could be an independent factor contributing to endurance performance. This study aimed at investigating whether prolonged low-intensity exercise induces shifts in the lactate threshold, and whether fatigue-induced changes differ between the sexes.
Methods
A total of 31 (15 females) recreational runners performed an incremental treadmill test and a 90-min low-intensity exercise (LIT90) on two separate occasions. The LIT90 was performed at 90% of the first lactate threshold speed (LT1v), derived from the incremental treadmill test. The LT1v was determined from a 5-stage (3 min) submaximal threshold test (SubmaxLT), performed before and after LIT90. The SubmaxLTs were followed by a 10/5 reactivity jump test. Respiratory gases, heart rate (HR), and HR-derived detrended fluctuation analysis alpha 1 (DFA-a1) were assessed every 15 min during the LIT90.
Results
A significant decrease (p < 0.01) was observed in the LT1v in females (− 5.8 ± 4.4%) and in males (− 5.3 ± 6.4%). The HR increased (p < 0.001) similarly in females (5.9 ± 3.1%) and in males (5.5 ± 3.6%) during the LIT90, while energy expenditure increased (3.1 ± 4.5%, p = 0.013) in females but remained unchanged in males (0.9 ± 3.1%). Change in DFA-a1 during the LIT90 was the only marker that correlated significantly with the relative change of LT1v (r = 0.463, p = 0.013).
Conclusion
LIT90 induced significant decreases in the LT1v, and the changes were comparable between sexes. DFA-a1 could be a potential intra-session marker of durability.
Keywords: endurance training; endurance; physiological effects; running; fatigue (biological phenomena); lactate threshold; resilience
Free keywords: physiological resilience; fatigue; fatigue resistance; endurance performance
Contributing organizations
Ministry reporting: Yes
VIRTA submission year: 2024
Preliminary JUFO rating: 1
