Abstract
Purpose
This study aimed to investigate the acute responses to repeated-sprint exercise (RSE) in hypoxia induced by voluntary hypoventilation at low lung volume (VHL).
Methods
Nine well-trained subjects performed two sets of eight 6-s sprints on a cycle ergometer followed by 24 s of inactive recovery. RSE was randomly carried out either with normal breathing (RSN) or with VHL (RSH-VHL). Peak (PPO) and mean power output (MPO) of each sprint were measured. Arterial oxygen saturation, heart rate (HR), gas exchange and muscle concentrations of oxy-([O2Hb]) and deoxyhaemoglobin/myoglobin ([HHb]) were continuously recorded throughout exercise. Blood lactate concentration ([La]) was measured at the end of the first (S1) and second set (S2).
Results
There was no difference in PPO and MPO between conditions in all sprints. Arterial oxygen saturation (87.7 ± 3.6 vs 96.9 ± 1.8% at the last sprint) and HR were lower in RSH-VHL than in RSN during most part of exercise. The changes in [O2Hb] and [HHb] were greater in RSH-VHL at S2. Oxygen uptake was significantly higher in RSH-VHL than in RSN during the recovery periods following sprints at S2 (3.02 ± 0.4 vs 2.67 ± 0.5 L min−1 on average) whereas [La] was lower in RSH-VHL at the end of exercise (10.3 ± 2.9 vs 13.8 ± 3.5 mmol.L−1; p < 0.01).
Conclusions
This study shows that performing RSE with VHL led to larger arterial and muscle deoxygenation than with normal breathing while maintaining similar power output. This kind of exercise may be worth using for performing repeated sprint training in hypoxia.
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Abbreviations
- [HHb]:
-
Muscle concentrations of deoxyhaemoglobin/myoglobin
- [La]:
-
Blood lactate concentration
- [O2Hb]:
-
Muscle concentrations of oxyhaemoglobin/myoglobin
- [tHb]:
-
Total haemoglobin/myoglobin
- ANOVA:
-
Analysis of variance
- FRC:
-
Functional residual capacity
- HR:
-
Heart rate
- MPO:
-
Mean power output
- NB:
-
Normal breathing
- NIRS:
-
Near-infrared spectroscopy
- PPO:
-
Peak power output
- RPE:
-
Rating of perceived exertion
- RSE:
-
Repeated-sprint exercise
- RSH:
-
Repeated sprints in hypoxia
- RSH-VHL:
-
Repeated sprints in hypoxia induced by voluntary hypoventilation at low lung volume
- RSN:
-
Repeated sprints in normoxia
- SpO2 :
-
Arterial oxygen saturation
- \(\mathop {V}\limits^{.} {\text{E}}\) :
-
Expired ventilation
- \(\mathop {V}\limits^{.} {\text{E}}/\mathop {V}\limits^{.} {\text{C}}{{\text{O}}_2}\) :
-
Ventilatory equivalent for carbon dioxide
- VHL:
-
Voluntary hypoventilation at low lung volume
- \(\mathop {V}\limits^{.} {{\text{O}}_2}\) :
-
Oxygen uptake
- \(\mathop {V}\limits^{.} {{\text{O}}_{2\hbox{max} }}\) :
-
Maximal oxygen uptake
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Acknowledgements
We would like to sincerely thank all the subjects who participated in this study for their hard efforts and dedicated time.
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Communicated by Susan Hopkins.
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Woorons, X., Mucci, P., Aucouturier, J. et al. Acute effects of repeated cycling sprints in hypoxia induced by voluntary hypoventilation. Eur J Appl Physiol 117, 2433–2443 (2017). https://doi.org/10.1007/s00421-017-3729-3
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DOI: https://doi.org/10.1007/s00421-017-3729-3