Int J Sports Med
DOI: 10.1055/a-1214-6309
Physiology & Biochemistry

Second Ventilatory Threshold Assessed by Heart Rate Variability in a Multiple Shuttle Run Test

1  School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Athinon, Greece
,
Stylianos N. Kounalakis
2  Faculty of Physical and Cultural Education, Evelpidon Military Academy, Vari, Greece
,
Panagiotis G. Miliotis
1  School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Athinon, Greece
,
Nikolaos D Geladas
1  School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Athinon, Greece
› Author Affiliations

Abstract

Many studies have focused on heart rate variability in association with ventilatory thresholds. The purpose of the current study was to consider the ECG-derived respiration and the high frequency product of heart rate variability as applicable methods to assess the second ventilatory threshold (VT2). Fifteen healthy young soccer players participated in the study. Respiratory gases and ECGs were collected during an incremental laboratory test and in a multistage shuttle run test until exhaustion. VΤ2 was individually calculated using the deflection point of ventilatory equivalents. In addition, VT2 was assessed both by the deflection point of ECG-derived respiration and high frequency product. Results showed no statistically significant differences between VT2, and the threshold as determined with high frequency product and ECG-derived respiration (F(2,28)=0.83, p=0.45, η2=0.05). A significant intraclass correlation was observed for ECG-derived respiration (r=0.94) and high frequency product (r=0.95) with VT2. Similarly, Bland Altman analysis showed a considerable agreement between VT2 vs. ECG-derived respiration (mean difference of −0.06 km·h−1, 95% CL: ±0.40) and VT2 vs. high frequency product (mean difference of 0.02 km·h−1, 95% CL: ±0.38). This study suggests that, high frequency product and ECG-derived respiration are indeed reliable heart rate variability indices determining VT2 in a field shuttle run test



Publication History

Received: 00 00 2020

Accepted: 30 June 2020

Publication Date:
07 August 2020 (online)

© Georg Thieme Verlag KG
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