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

Zhang, H, Nie, J, Kong, Z, Cao, W, Zhu, X, Zheng, Z and George, KP (2019) The cTnT response to acute exercise at the onset of an endurance training program: evidence of exercise preconditioning? European Journal of Applied Physiology. ISSN 1439-6327

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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% [Formula: see text], 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.

Item Type: Article
Additional Information: This is a post-peer-review, pre-copyedit version of an article published in European Journal of Applied Physiology. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00421-019-04074-0
Uncontrolled Keywords: 1106 Human Movement and Sports Sciences
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Springer Verlag
Related URLs:
Date Deposited: 25 Jan 2019 10:49
Last Modified: 25 Jan 2019 10:55
DOI or Identification number: 10.1007/s00421-019-04074-0
URI: http://researchonline.ljmu.ac.uk/id/eprint/10017

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