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Erschienen in:
10.09.2016 | Original Article
Markers of biological stress in response to a single session of high-intensity interval training and high-volume training in young athletes
Erschienen in: European Journal of Applied Physiology | Ausgabe 11-12/2016
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Purpose
The aim of the present study was to compare the effects of high-intensity interval training (HIIT) vs high-volume training (HVT) on salivary stress markers [cortisol (sC), testosterone (sT), alpha-amylase (sAA)], metabolic and cardiorespiratory response in young athletes.
Methods
Twelve young male cyclists (14 ± 1 years; 57.9 ± 9.4 mL min−1 kg−1 peak oxygen uptake) performed one session of HIIT (4 × 4 min intervals at 90–95 % peak power output separated by 3 min of active rest) and one session of HVT (90 min constant load at 60 % peak power output). The levels of sC, sT, their ratio (sT/sC) and sAA were determined before and 0, 30, 60, 180 min after each intervention. Metabolic and cardiorespiratory stress was characterized by blood lactate, blood pH, respiratory exchange ratio (RER) and heart rate (HR), oxygen uptake (\(V_{{{\text{O}}_{ 2} }}\)), ventilation (V
E) and ventilatory equivalent (V
E/\(V_{{{\text{O}}_{ 2} }}\)).
Results
sC increased 30 and 60 min after HIIT. However, 180 min post exercise, sC decreased below baseline levels in both conditions. sT increased 0 and 30 min after HIIT and 0 min after HVT. sAA and sT/sC ratio did not change significantly over time in HIIT nor HVT. Metabolic and cardiorespiratory stress, evidenced by blood lactate, HR, \(V_{{{\text{O}}_{ 2} }}\), V
E, and V
E/\(V_{{{\text{O}}_{ 2} }}\) was higher during HIIT compared to HVT.
Conclusion
The metabolic and cardiorespiratory stress during HIIT was higher compared to HVT, but based on salivary analyses (cortisol, testosterone, alpha-amylase), we conclude no strong acute catabolic effects neither by HIIT nor by HVT.