Pulmonary oxygen uptake ( V ˙ O 2 ) kinetics following the onset of constant work rate exercise provides a useful assessment of the integrated capacity of the organism to transport and utilizes O 2 to support the increased rate of energy turnover in the contracting myocytes ( 104 ). The onset of
Neil Armstrong and Jo Welsman
Aerobic fitness defines the ability to deliver oxygen to the muscles and to use it to generate energy to support muscle activity during exercise. Peak oxygen uptake ( V ˙ O 2 ), the highest V ˙ O 2 achieved during an incremental exercise test to exhaustion, is internationally recognized as the
Kenneth D. Coutts
Nine male elite wheelchair athletes performed a continuous progressive exercise test on a wheelchair ergometer to determine peak oxygen uptake. Three were paraplegic distance track competitors (SCI–TR), three were amputee distance track athletes (AMP–TR), and three were paraplegic basketball players (SCI–BB). Analysis of variance indicated a significant difference in the relative peak oxygen uptake between the groups, with the SCI–TR and AMP–TR groups having higher values than the SCI–BB group. No group differences were found in age, mass, oxygen uptake, ventilation, heart rate, ventilatory equivalent for oxygen, and oxygen pulse at maximal exercise. The absence of the mass of the lower extremities in the AMP–TR group has a significant effect on peak oxygen uptake relative to body mass, and relative peak oxygen uptake differences between individual SCI–TR and AMP–TR athletes did not appear to reflect performance differences in actual distance track events.
Bettina Karsten, Jonathan Baker, Fernando Naclerio, Andreas Klose, Antonino Bianco and Alfred Nimmerichter
observed ( F 2,22 = 2.3, P = .129, η p 2 = 0.17 ). Table 3 Oxygen-Uptake Responses During Time-Trial (TT) and Time-to-Exhaustion (TTE) Conditions, Mean ± SD TT TT1 TT2 TT3 Baseline (L/min) 1.12 ± 0.26 1.09 ± 0.30 1.10 ± 0.21 Primary Amplitude (L/min) 3.75 ± 0.68 3.91 ± 0.67 3.89 ± 0.84 Mean response
Kate M. Sansum, Max E. Weston, Bert Bond, Emma J. Cockcroft, Amy O’Connor, Owen W. Tomlinson, Craig A. Williams and Alan R. Barker
Maximal oxygen uptake ( V ˙ O 2 max ), typically expressed in relation to a measure of body size, is the “gold-standard” measure of cardiorespiratory fitness (CRF) ( 10 ). A valid measurement of V ˙ O 2 max is important in children and adolescents because a high CRF in youth is associated with a
Kirsty Brock, Prokopios Antonellis, Matthew I. Black, Fred J. DiMenna, Anni Vanhatalo, Andrew M. Jones and Stephen J. Bailey
The transition from rest to exercise mandates an immediate increase in skeletal-muscle contractile activity and ATP turnover. In contrast, the rate of pulmonary oxygen uptake ( V ˙ O 2 ) increases with exponential response kinetics, 1 which closely reflects the kinetics of muscle V ˙ O 2 , 2
Tatiane Piucco, Rogério Soares, Fernando Diefenthaeler, Guillaume Y. Millet and Juan M. Murias
delay; V ˙ O 2 , oxygen uptake; V ˙ O 2 Ap , V ˙ O 2 amplitude; V ˙ O 2 BL , baseline V ˙ O 2 ; V ˙ O 2 TD , V ˙ O 2 time delay; τ V ˙ O 2 , V ˙ O 2 time constant; τ [HHbMb], HHb time constant. Values are presented as mean (SD). a Different from treadmill. Figure 1 —Group mean V ˙ O 2 and
Moniek Akkerman, Marco van Brussel, Bart C. Bongers, Erik H.J. Hulzebos, Paul J.M Helders and Tim Takken
The objective of this study was to investigate the characteristics of the submaximal Oxygen Uptake Efficiency Slope (OUES) in a healthy pediatric population. Bicycle ergometry exercise tests with gas-analyses were performed in 46 healthy children aged 7–17 years. Maximal OUES, submaximal OUES, V̇O2peak, VEpeak, and ventilatory threshold (VT) were determined. The submaximal OUES correlated highly with V̇O2peak, VEpeak, and VT. Strong correlations were found with basic anthropometric variables. The submaximal OUES could provide an objective, independent measure of cardiorespiratory function in children, reflecting efficiency of ventilation. We recommend expressing OUES values relative to Body Surface Area (BSA) or Fat Free Mass (FFM).
Emma M. Crum, Matthew J. Barnes and Stephen R. Stannard
subsequent study by Crum et al. ( 2017a ) in highly trained cyclists (maximal oxygen uptake, VO 2 max = 74 ml·min −1 ·kg −1 ) using a similar supplementation protocol failed to replicate any performance benefits in a cycling TTE (100% VO 2 max), in either normoxic or hypoxic conditions. In addition, despite
Kathleen M. Shuleva, Gary R. Hunter, Donna J. Hester and Donna L. Dunaway
This study compared submaximal and maximal oxygen uptake (V̇O2 max) in children ages 3–4 and 5–6 years. Methods appropriate for this age group were developed to elicit maximal performance on the exercise tests. Subjects (N = 22) performed progressive treadmill walking tests. The criteria used to determine whether V̇O2 max was reached were a plateauing of oxygen uptake, HR > 195, and an R > 1.00. The V̇O2 max for the 3- and 4-year-olds (44.5 ml•kg−1•min−1) was not significantly different from that of the 5- and 6-year-olds (44.1 ml•kg−1•min−1). At submaximal levels, 5- and 6-year-olds had significantly lower relative oxygen uptake, indicating better economy in walking. A large proportion of children met testing criteria for V̇O2 max. Test-retest results indicated that the tests were reliable.