Key result
High cardiorespiratory fitness was associated with significantly higher oxygen consumption at the ventilatory threshold compared to low fitness, though the correspondence between thresholds was weaker in highly fit individuals.
Why the study?
The study was conducted to evaluate the correspondence between heart rate variability and ventilatory thresholds during a progressive exercise test, and to determine its relationship with low and high aerobic fitness levels.
Does aerobic fitness level influence the correspondence between heart rate variability thresholds and ventilatory thresholds during a progressive exercise test in healthy males?
Cross-Sectional (n=20)
No
Does aerobic fitness level influence the correspondence between heart rate variability thresholds and ventilatory thresholds during a progressive exercise test in healthy males?
Standardized Mean Difference: 1.58
Absolute Event Rate: 36.3% vs 27.3%
p-value: p=<0.05
Cardiorespiratory fitness affects the correspondence between heart rate variability thresholds and ventilatory thresholds, suggesting HRVT should be used with caution as a metabolic transition tool in highly fit individuals.
May caution against uniform VT application in high-fit individuals; leaves open prospective validation of fitness-stratified thresholds.
The aims of this study were to verify the correspondence between heart rate variability (HRV) and ventilatory thresholds during a progressive exercise test and the relationship with low and high aerobic fitness levels. Twenty male volunteers (29.5±6.2 years; 75.9±13.0 kg; 175.0±7.4 cm) were recruited. The subjects were allocated to two groups according to their VO2max <48.8 ml•kg−1•min−1 (low cardiorespiratory fitness group) (n=10) and >48.81 ml•kg−1•min−1 (high cardiorespiratory fitness group) (n=10). A progressive test was performed, consisting of 3-min stages beginning at 25 watts and increasing by 25 watts every 3-min. The HRV threshold (HRVT) and ventilatory threshold (VT) analyses were performed through visual inspection. The comparisons with RMSSD values in percentage of maximum workload resulted in a higher effect size (ES) than the SDNN values. The VO2 in the high cardiorespiratory fitness group at VT (+32%), HRVTRMSSD (+27%), and HRVTSDNN (+31%) was signifi cantly higher compared to the group with low cardiorespiratory fitness. Higher values were observed for relative load (W•kg-1) at VT and HRVTSDNN in the high cardiorespiratory fitness group in comparison with the low cardiorespiratory fitness group (P<0.05), but no difference for VT and HRVTRMSSD. Signifi cant correlations between at VT and HRVTSDNN (r=0.77) were found only in the low cardiorespiratory fitness group. Cardiorespiratory fitness should be regarded as a factor for HRVT evaluation. The HRVTSDNN was closer to the VT in the low cardiorespiratory fitness group than the HRVTRMSSD, however, the use of vagal modulation assessed using the HRV parameter was more sensitive to observe possible differences regarding cardiorespiratory fitness.
No takes yet. Share an insight, caveat, or question.
Soares-Caldeira et al. (2020) conducted a cross-sectional in Healthy volunteers (n=20). High cardiorespiratory fitness (VO2max > 48.8 ml/kg/min) vs. Low cardiorespiratory fitness (VO2max < 48.8 ml/kg/min) was evaluated on VO2 at ventilatory threshold (VT) (ES 1.58, p=<0.05). High cardiorespiratory fitness was associated with significantly higher oxygen consumption at the ventilatory threshold compared to low fitness, though the correspondence between thresholds was weaker in highly fit individuals.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: