Abstract
Purpose
This study investigated whether muscle cooling and its associated effects on skeletal muscle oxidative responses, blood gases, and hormonal concentrations influenced energy metabolism during cycling.
Methods
Twelve healthy participants (Males: seven; Females: five) performed two steady-state exercise sessions at 70% of ventilatory threshold on a cycle ergometer. Participants completed one session with pre-exercise leg cooling until muscle temperature (Tm) decreased by 6 °C (LCO), and a separate session without cooling (CON). They exercised until Tm returned to baseline and for an additional 30 min. Cardiovascular, respiratory, metabolic, hemodynamic variables, and skeletal muscle tissue oxidative responses were assessed continuously. Venous blood samples were collected to assess blood gases, and hormones.
Results
Heart rate, stroke volume, and cardiac output all increased across time but were not different between conditions. V̇O2 was greater in LCO when muscle temperature was restored until the end of exercise (p < 0.05). Cycling in the LCO condition induced lower oxygen availability, tissue oxygenation, blood pH, sO2%, and pO2 (p < 0.05). Insulin concentrations were also higher in LCO vs. CON (p < 0.05). Importantly, stoichiometric equations from respiratory gases indicated no differences in fat and CHO oxidation between conditions.
Conclusion
The present study demonstrated that despite muscle cooling and the associated oxidative and biochemical changes, energy metabolism remained unaltered during cycling. Whether lower local and systemic oxygen availability is counteracted via a cold-induced activation of lipid metabolism pathways needs to be further investigated.
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Abbreviations
- %TSI:
-
Percentage tissue saturation index
- CHO:
-
Carbohydrates
- CPT-1:
-
Carnitine palmitoyl transferase-I
- diffHb:
-
Difference oxy/deoxygenated hemoglobin
- HHb:
-
Deoxygenated hemoglobin
- NIRS:
-
Near-infrared spectrometry
- O2Hb:
-
Oxygenated hemoglobin
- PCO2 :
-
Partial pressure of carbon dioxide
- PO2 :
-
Partial pressure of oxygen
- RER:
-
Respiratory exchange ratio
- tHb:
-
Total hemoglobin
- T c :
-
Core temperature
- T m :
-
Muscle temperature
- T̅ sk :
-
Mean weighted skin temperature
- V̇E:
-
Minute ventilation
- VL:
-
Vastus lateralis
- VT:
-
Ventilatory threshold
- V t :
-
Tidal volume
- V̇O2peak :
-
Peak oxygen consumption
- V̇O2 :
-
Rate of oxygen consumption
- V̇CO2 :
-
Rate of carbon dioxide release
- W :
-
Watts
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Acknowledgements
We want to thank all participants for taking part in this study. Dr. Gagnon is supported by a Natural Sciences and Engineering Research Council of Canada Discovery Grant (NSERC#2016-060883).
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All authors contributed to the study conception and design. Material preparation was performed by DDG, CH, AM, JG, and NB-B. Data collection DDG, CH, AM, DM, LW, SM, and NB-B. Data reduction and analysis were performed by DDG, LW, JG, and SM. The first draft of the manuscript was written by DDG and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Gagnon, D.D., Hancock, C., McCue, A. et al. Muscle cooling modulates tissue oxidative and biochemical responses but not energy metabolism during exercise. Eur J Appl Physiol 120, 1761–1775 (2020). https://doi.org/10.1007/s00421-020-04407-4
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DOI: https://doi.org/10.1007/s00421-020-04407-4