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Impact of high-intensity interval and moderate-intensity continuous exercise on heart rate variability and cardiac troponin.

Huang, C, Kong, Z, Nie, J, Pan, M, Zhang, H, Shi, Q and George, KP (2021) Impact of high-intensity interval and moderate-intensity continuous exercise on heart rate variability and cardiac troponin. Journal of Sports Medicine and Physical Fitness, 61 (9). pp. 1301-1308. ISSN 0022-4707

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Abstract

BACKGROUND: It remains uncertain whether exercise modality (high-intensity interval [HIE]; moderate-intensity continuous [MCE]) mediates exercise-induced changes in markers of pro-arrhythmogenic state and/or cardiac damage. This study examines heart rate variability (HRV) and cardiac troponin T (cTnT) kinetic responses to HIE and MCE. METHODS: Fourteen sedentary, overweight/obese females completed two trials including HIE (2-min running at 90% V̇O<inf>2max</inf> followed by 2-min running at 50% V̇O<inf>2max</inf>, repeated for 60 min) and MCE (70% V̇O<inf>2max</inf> steady-state running for 60 min) in a randomized, counterbalanced fashion. Supine HRV was evaluated as root mean square of successive differences (RMSSD), normalized low-frequency (LF) and high-frequency (HF) spectral power, as well as the LF/HF ratio before (PRE), immediately (0 HR), 3 (3 HR) and 24 (24 HR) hours after exercise. Serum cTnT was assessed using a high-sensitivity assay at the same time-points and the values were corrected for plasma volume changes. RESULTS: Exercise temporarily altered all HRV indices (i.e. RMSSD and HF decreased; LF and LF/HF ratio increased at 0 HR, all P<0.05) but a rebound increase of RMSSD was observed at 24 HR, and the kinetic responses of HRV were similar between exercise modalities. The cTnT was significantly elevated (P<0.05) after exercise at 3 HR (by 688%) and 24 HR (by 374%) with no between-modality differences. There was no significant correlation between delta change in cTnT and HRV metrics. CONCLUSIONS: Exercise modality (workload-equivalent HIE vs. MCE) did not mediate exercise-induced alteration in autonomic activity and cTnT elevation, and it seems these are largely separate exercise-induced phenomena.

Item Type: Article
Uncontrolled Keywords: 0913 Mechanical Engineering, 1106 Human Movement and Sports Sciences
Subjects: Q Science > QP Physiology
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Edizioni Minerva Medica
Related URLs:
Date Deposited: 12 Oct 2021 12:33
Last Modified: 12 Oct 2021 12:45
DOI or Identification number: 10.23736/S0022-4707.20.11657-8
URI: https://researchonline.ljmu.ac.uk/id/eprint/15631

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