Agreement of Ultra-Short-Term Heart Rate Variability Recordings During Overseas Training Camps in Under-20 National Futsal Players

Yung-Sheng Chen; Jeffrey C Pagaduan; Pedro Bezerra; Zachary J Crowley-McHattan; Cheng-Deng Kuo; Filipe Manuel Clemente

doi:10.3389/fpsyg.2021.621399

Agreement of Ultra-Short-Term Heart Rate Variability Recordings During Overseas Training Camps in Under-20 National Futsal Players

Front Psychol. 2021 Feb 5:12:621399. doi: 10.3389/fpsyg.2021.621399. eCollection 2021.

Authors

Yung-Sheng Chen^{1

2}, Jeffrey C Pagaduan³, Pedro Bezerra^{4

5}, Zachary J Crowley-McHattan⁶, Cheng-Deng Kuo^{7

8

9}, Filipe Manuel Clemente^{4

10}

Affiliations

¹ Department of Exercise and Health Sciences, University of Taipei, Taipei, Taiwan.
² Exercise and Health Promotion Association, New Taipei City, Taiwan.
³ College of Health and Medicine, School of Health Sciences, University of Tasmania, Hobart, TAS, Australia.
⁴ Escola Superior Desporto e Lazer, Instituto Politécnico de Viana do Castelo, Viana do Castelo, Portugal.
⁵ The Research Centre in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal.
⁶ School of Health and Human Sciences, Southern Cross University, Lismore, NSW, Australia.
⁷ Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan.
⁸ Department of Medicine, Taian Hospital, Taipei, Taiwan.
⁹ Tanyu Research Laboratory, Taipei, Taiwan.
¹⁰ Instituto de Telecomunicações, Delegação da Covilhã, Lisboa, Portugal.

Abstract

Background: Monitoring the daily change in resting heart rate variability (HRV) can provide information regarding training adaptation and recovery status of the autonomic nervous system (ANS) during training camps. However, it remains unclear whether postural stabilization is essential for valid and reliable ultra-short-term (HRV_UST) recordings in short-term overseas training camps. Design: Observational and longitudinal study. Purpose: This study aimed to investigate ultra-short-term heart rate variability recordings under stabilization or post-stabilization periods in four overseas training camps. Participant: Twenty-seven U-20 male national team futsal players voluntarily participated in this study. Method: Resting HRV was evaluated for 10 min during the early morning of each training camp. The natural logarithm of the root mean square of successive normal-to-normal interval differences (LnRMSSD) was used for comparisons. Time segments of HRV were divided into two periods with three measures within each: (1) the first 30-s (1st_30 s LnRMSSD), the first 60-s (1st_60 s LnRMSSD), and the 5-min standard (1st_5 min LnRMSSD) during stabilization; (2) the first 30-s (2nd_30 s LnRMSSD), the first 60-s (2nd_60 s LnRMSSD), and the 5-min standard (2nd_5 min LnRMSSD) after stabilization. Result: The results demonstrated trivial to small ES (-0.03; 0.46), very large to nearly perfect ICC (0.76; 0.98), and narrow range of SEM (0.06; 0.31) when all time segments of HRV_UST were compared to the 1st_5 min and 2nd_5 min HRV. Furthermore, the magnitude of the correlation coefficients ranged from very high to nearly perfect for all the time segments (r = 0.83; 0.97). The HRV_UST posted excellent agreement in all time segments (bias = -0.05; 0.12) with/without postural stabilization. Trivial to small levels of effect size in all time segments of LnRMSSD_mean (0.02; 0.41 ES) and LnRMSSD_cv (-0.49; -0.02 ES) across overseas training camps was identified. Conclusion: The first 30 or 60-s LnRMSSD recordings can be used to evaluate daily cardiac-autonomic function during overseas training camps in futsal players. The process for stabilization seems to be unnecessary for measuring the morning resting LnRMSSD in overseas training camps among young adult futsal players.

Keywords: autonomic nervous system; futsal training; heart rate variability; overseas training camps; ultra-short-term recording.