Durability of the moderate-to-heavy-intensity transition is related to the effects of prolonged exercise on severe-intensity performance
Purpose Power output at the moderate-to-heavy-intensity transition decreases during prolonged exercise, and resilience to this has been termed ‘durability’. The purpose of this study was to assess the relationship between durability and the effect of prolonged exercise on severe-intensity performanc...
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Published in | European journal of applied physiology Vol. 124; no. 8; pp. 2427 - 2438 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.08.2024
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Purpose
Power output at the moderate-to-heavy-intensity transition decreases during prolonged exercise, and resilience to this has been termed ‘durability’. The purpose of this study was to assess the relationship between durability and the effect of prolonged exercise on severe-intensity performance, and explore intramuscular correlates of durability.
Methods
On separate days, 13 well-trained cyclists and triathletes (V̇O
2
peak, 57.3 ± 4.8 mL kg
−1
min
−1
; training volume, 12 ± 2.1 h week
−1
) undertook an incremental test and 5-min time trial (TT) to determine power output at the first ventilatory threshold (VT
1
) and severe-intensity performance, with and without 150-min of prior moderate-intensity cycling. A single resting
vastus lateralis
microbiopsy was obtained.
Results
Prolonged exercise reduced power output at VT
1
(211 ± 40 vs. 198 ± 39 W, ∆ -13 ± 16 W, ∆ -6 ± 7%,
P
= 0.013) and 5-min TT performance (333 ± 75 vs. 302 ± 63 W, ∆ -31 ± 41 W, ∆ -9 ± 10%,
P
= 0.017). The reduction in 5-min TT performance was significantly associated with durability of VT
1
(r
s
= 0.719,
P
= 0.007). Durability of VT
1
was not related to
vastus lateralis
carnosine content, citrate synthase activity, or complex I activity (
P
> 0.05).
Conclusion
These data provide the first direct support that durability of the moderate-to-heavy-intensity transition is an important performance parameter, as more durable athletes exhibited smaller reductions in 5-min TT performance following prolonged exercise. We did not find relationships between durability and
vastus lateralis
carnosine content, citrate synthase activity, or complex I activity. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Communicated by Philip D. Chilibeck. |
ISSN: | 1439-6319 1439-6327 1439-6327 |
DOI: | 10.1007/s00421-024-05459-6 |