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Biochemical responses and physical performance during high-intensity resistance circuit training in hypoxia and normoxia

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Abstract

Purpose

The aim of this study was to analyze the effect of hypoxia on metabolic and acid–base balance, blood oxygenation, electrolyte, and half-squat performance variables during high-resistance circuit (HRC) training.

Methods

Twelve resistance-trained subjects participated in this study. After a 6RM testing session, participants performed three randomized trials of HRC: normoxia (NORM: FiO2 = 0.21), moderate hypoxia (MH: FiO2 = 0.16), or high hypoxia (HH: FiO2 = 0.13), separated by 72 h of recovery in normoxic conditions. HRC consisted of two blocks of three exercises (Block 1: bench press, deadlift and elbow flexion; Block 2: half-squat, triceps extension, and ankle extension). Each exercise was performed at 6RM. Rest periods lasted for 35 s between exercises, 3 min between sets, and 5 min between blocks. Peak and mean force and power were determined during half-squat. Metabolic, acid–base balance, blood oxygenation and electrolyte variables, arterial oxygen saturation (SaO2), and rating of perceived exertion (RPE) were measured following each block.

Results

During the first set, peak force and power were significantly lower in HH than MH and NORM; whereas in the second set, mean and peak force and power were significantly lower in HH than NORM. At the end of the HRC training session, blood lactate and RPE in HH were significantly higher than in MH and NORM. SaO2, pH, HCO3 , and pO2 values were significantly lower in all hypoxic conditions than in NORM.

Conclusion

These results indicate that simulated hypoxia during HRC exercise reduce blood oxygenation, pH, and HCO3 −, and increased blood lactate ultimately decreasing muscular performance.

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Abbreviations

ACSM:

American college of sports medicine

ATP:

Adenosine triphosphate

Ca2+ :

Calcium

Cl :

Chloride

cm:

Centimeter

FiO2 :

Fraction of inspired oxygen

Glu:

Glucose

H+ :

Hydrogen

HCO3 :

Bicarbonate

HH:

High hypoxia

HRC:

High-resistance circuit

K+ :

Potassium

l:

Litre

m:

Meter

MH:

Moderate hypoxia

min:

Minute

kg:

Kilogram

Na+ :

Sodium

NORM:

Normoxia

pCO2 :

Carbon dioxide partial pressure

PCr:

Phosphocreatine

pO2 :

Oxygen partial pressure

RM:

Maximum repetition

RPE:

Rating of perceived exertion

RT:

Resistance training

RTH:

Resistance training under hypoxia

s:

Second

SaO2 :

Arterial oxygen saturation

SPSS:

Statistical package for the social sciences

W:

Watt

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Acknowledgements

The authors thank Arturo Camacho and Antonio Martínez-Garrido for their help during the testing sessions and all the athletes who participated in this study.

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Correspondence to Domingo J. Ramos-Campo.

Additional information

Communicated by William J. Kraemer.

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Ramos-Campo, D.J., Rubio-Arias, J.A., Dufour, S. et al. Biochemical responses and physical performance during high-intensity resistance circuit training in hypoxia and normoxia. Eur J Appl Physiol 117, 809–818 (2017). https://doi.org/10.1007/s00421-017-3571-7

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  • DOI: https://doi.org/10.1007/s00421-017-3571-7

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