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The impact of short duration, high intensity exercise on cardiac troponin release
Author(s) -
George Keith P,
Grant Marie Clare,
Davies Bruce,
Baker Julien S.
Publication year - 2016
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/cpf.12225
Subject(s) - medicine , troponin i , heart rate , cardiology , blood lactate , troponin , troponin complex , sprint , exercise physiology , intensity (physics) , blood pressure , catecholamine , physical therapy , myocardial infarction , physics , quantum mechanics
Summary The aim of this study was to assess the appearance of cardiac troponins ( cTnI and/or cTnT ) after a short bout (30 s) of ‘all‐out’ intense exercise and to determine the stability of any exercise‐related cTnI release in response to repeated bouts of high intensity exercise separated by 7 days recovery. Eighteen apparently healthy, physically active, male university students completed two all‐out 30 s cycle sprint, separated by 7 days. cTnI , blood lactate and catecholamine concentrations were measured before, immediately after and 24 h after each bout. Cycle performance, heart rate and blood pressure responses to exercise were also recorded. Cycle performance was modestly elevated in the second trial [6·5% increase in peak power output (PPO)]; there was no difference in the cardiovascular, lactate or catecholamine response to the two cycle trials. cTnI was not significantly elevated from baseline through recovery (Trial 1: 0·06 ± 0·04 ng ml −1 , 0·05 ± 0·04 ng ml −1 , 0·03 ± 0·02 ng ml −1 ; Trial 2: 0·02 ± 0·04 ng ml −1 , 0·04 ± 0·03 ng ml −1 , 0·05 ± 0·06 ng ml −1 ) in either trial. Very small within subject changes were not significantly correlated between the two trials ( r = 0·06; P >0·05). Subsequently, short duration, high intensity exercise does not elicit a clinically relevant response in cTnI and any small alterations likely reflect the underlying biological variability of cTnI measurement within the participants.