Prior heavy knee extension exercise does not affect VO2 kinetics during subsequent heavy cycling exercise

John R. Thistlethwaite, Benjamin C. Thompson, Joaquin Gonzales, Barry W. Scheuermann

Research output: Contribution to journalArticlepeer-review

Abstract

This study examined the magnitude of the oxygen uptake slow component (VO(2) SC) during heavy exercise when preceded by heavy knee extension (KE) exercise. Nine males (26.6 +/- 1.7 years, +/-SE) performed repeated bouts of heavy exercise, each lasting 6 min with 6 min of recovery. Cycling-cycling trials (CYC(1), CYC(2)) involved step transitions to a workrate corresponding to 50% of the difference between peak VO(2) and the lactate threshold (Delta 50%). During bilateral KE-cycling trails (KE, CYC(3)), KE was performed at an intensity requiring twofold greater muscle activation relative to CYC(1) followed by a cycling transition to Delta 50%. VO(2) was measured breath-by-breath and was modeled using three exponentials to determinate the amplitudes (A (2)', A (3)') and time constants (tau (2), tau (3)) of the primary phase and VO(2) SC. Electromyography (EMG) recorded from the vastus lateralis and medialis was averaged and reported relative to maximal voluntary contraction (%MVC). EMG
Original languageEnglish
Pages (from-to)481-491
JournalEuropean Journal of Applied Physiology
StatePublished - Nov 20 2007

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