AUTHOR=Buchheit Martin , Hader karim , Alberto Mendez-Villanueva 

TITLE=Tolerance to high-intensity intermittent running exercise: do oxygen uptake kinetics really matter?

JOURNAL=Frontiers in Physiology

VOLUME=3

YEAR=2012

URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2012.00406

DOI=10.3389/fphys.2012.00406

ISSN=1664-042X

ABSTRACT=<p>We examined the respective associations between aerobic fitness (<inline-formula><mml:math id="M1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max), metabolic control (<inline-formula><mml:math id="M2" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula> kinetics) and locomotor function, and various physiological responses to high-intensity intermittent (HIT) running exercise in team sport players. Eleven players (30.5 ± 3.6 year) performed a series of tests to determine their <inline-formula><mml:math id="M3" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max and the associated velocity (v<inline-formula><mml:math id="M4" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max), maximal sprinting speed (MSS) and <inline-formula><mml:math id="M5" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula> kinetics at exercise onset in the moderate and severe intensity domains, and during recovery (<inline-formula><mml:math id="M6" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mi>O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>τ</mml:mi><mml:mrow><mml:mtext>off</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:math></inline-formula> SEV). Cardiorespiratory variables, oxygenation and electromyography of lower limbs muscles and blood lactate ([La]) concentration were collected during a standardized HIT protocol consisting in 8 sets of 10, 4-s runs. During HIT, four players could not complete more than two sets; the others finished at least five sets. Metabolic responses to the two first sets of HIT were negatively correlated with <inline-formula><mml:math id="M7" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max, v<inline-formula><mml:math id="M8" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max, and <inline-formula><mml:math id="M9" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mi>O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>τ</mml:mi><mml:mrow><mml:mtext>off</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:math></inline-formula> SEV (<italic>r</italic> = −0.6 to −0.8), while there was no clear relationship with the other variables. <inline-formula><mml:math id="M10" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>, oxygenation and [La] responses to the first two sets of HIT were the only variables that differed between the players which could complete at least five sets or those who could not complete more than two sets. Players that managed to run at least five sets presented, in comparison with the others, greater v<inline-formula><mml:math id="M11" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max [ES = +1.5(0.4; 2.7), MSS(ES = +1.0(0.1; 1.9)] and training load [ES = +3.8 (2.8; 4.9)]. There was no clear between-group difference in any of the <inline-formula><mml:math id="M12" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula> kinetics measures [e.g., ES = −0.1(−1.4; 1.2) for <inline-formula><mml:math id="M13" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mi>O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>τ</mml:mi><mml:mrow><mml:mtext>on</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:math></inline-formula> SEV]. While <inline-formula><mml:math id="M14" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max and v<inline-formula><mml:math id="M15" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula>max are likely determinant for HIT tolerance, the importance of <inline-formula><mml:math id="M16" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>V</mml:mi><mml:mo>˙</mml:mo></mml:mover><mml:msub><mml:mtext>O</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math></inline-formula> kinetics as assessed in this study appears limited in the present population. Knowing the main factors influencing tolerance to HIT running exercise may assist practitioners in personalizing training interventions.</p>