Bioenergetics and neuromuscular determinants of the time to exhaustion at velocity corresponding to VO2max in recreational long-distance runners.
The purpose of this study was to investigate the main bioenergetics and neuromuscular determinants of the time to exhaustion (T(lim)) at the velocity corresponding to maximal oxygen uptake in recreational long-distance runners. Twenty runners performed the following tests on 5 different days: (a) maximal incremental treadmill test, (b) 2 submaximal tests to determine running economy and vertical stiffness, (c) exhaustive test to measured the T(lim), (d) maximum dynamic strength test, and (e) muscle power production test. Aerobic and anaerobic energy contributions during the T(lim) test were also estimated. The stepwise multiple regression method selected 3 independent variables to explain T(lim) variance. Total energy production explained 84.1% of the shared variance (p = 0.001), whereas peak oxygen uptake (V(O2)peak) measured during T(lim)and lower limb muscle power ability accounted for the additional 10% of the shared variance (p = 0.014). These data suggest that the total energy production, V(O2)peak, and lower limb muscle power ability are the main physiological and neuromuscular determinants of T(lim)in recreational long-distance runners.
Endurance Sports Research Group, Department of Sport, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil. bertuzzi@usp.br
Romulo
R
Bertuzzi
Salomão
S
Bueno
Leonardo A
LA
Pasqua
Fernanda M
FM
Acquesta
Mauro B
MB
Batista
Hamilton
H
Roschel
Maria A P D M
MA
Kiss
Júlio C
JC
Serrão
Valmor
V
Tricoli
Carlos
C
Ugrinowitsch
D056352:Athletes; D004734:Energy Metabolism / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D035002:Lower Extremity / Q000502:physiology; D008451:Maximal Voluntary Ventilation; D018763:Muscle Fatigue / Q000502:physiology*; D053580:Muscle Strength / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*; D012420:Running / Q000502:physiology*