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Erschienen in: European Journal of Applied Physiology 4/2019

09.01.2019 | Original Article

The cTnT response to acute exercise at the onset of an endurance training program: evidence of exercise preconditioning?

verfasst von: Haifeng Zhang, Jinlei Nie, Zhaowei Kong, Wenling Cao, Xiangui Zhu, Ziwei Zheng, Keith George

Erschienen in: European Journal of Applied Physiology | Ausgabe 4/2019

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Abstract

Purpose

Exercise induces a cardioprotective effect referred to as “preconditioning”. Whether the preconditioning impacts upon the cardiac troponin T (cTnT) response to subsequent exercise bouts is unclear. This study investigated the effects of an initial exercise bout, a second exercise bout 48 h later, as well as subsequent exercise every 48 h for 4 days or a single identical exercise bout after 8 days of inactivity gap on cTnT response to acute exercise.

Methods

Twenty-eight sedentary overweight young women were randomly assigned to either six bouts of exercise each separated by 48 h or three bouts of exercise with 48 h between the first two bouts and 8 days between the second and third bouts. All exercise bouts were identical (60% \(\dot {V}{{\text{O}}_{2{\rm max} }}\), 200 kJ) and the total testing period (10 days) was the same for both groups. cTnT was assessed before and after the 1st, 2nd, and final exercise bouts.

Results

cTnT increased (129%, P < 0.05) after the first bout of exercise in both groups (peak post-exercise cTnT, median [range], ng l−1: 3.43[< 3.00−27.26]) with no between-group differences in the response. The second exercise bout had no significant (P > 0.05) effect on post-exercise cTnT (< 3.00[< 3.00−21.96]). The final exercise bout resulted in an increase (190%, P < 0.05) in cTnT (4.35[< 3.00−13.05]) in both groups.

Conclusions

A single bout exercise resulted in a temporary blunting of cTnT response to acute exercise 48 h later. The effect of exercise preconditioning was not preserved, regardless of whether followed by repeated exercise every 48 h or a cessation of exercise for 8 days.
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Metadaten
Titel
The cTnT response to acute exercise at the onset of an endurance training program: evidence of exercise preconditioning?
verfasst von
Haifeng Zhang
Jinlei Nie
Zhaowei Kong
Wenling Cao
Xiangui Zhu
Ziwei Zheng
Keith George
Publikationsdatum
09.01.2019
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Applied Physiology / Ausgabe 4/2019
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-019-04074-0

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