How long does it take to achieve steady state for an accurate assessment of resting $$ \dot{\text{V}}{\text{O}}_{2} $$ in healthy men?

Cunha, Felipe; Midgley, Adrian W.; Monteiro, Walace David; Freire, Raúl; Lima, Tainah; Farinatti, Paulo

doi:10.1007/s00421-012-2571-x

Cited by 25 publications

(17 citation statements)

References 27 publications

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“…The time of resting VO 2 was split into 5min stationary time averages. The mean of data assessed in the last 5 min of steadystate was registered as the resting VO 2 , which was further confirmed by a withinsubject coefficient of variation lower than 10 % for both VO 2 and VCO 2 [7].…”

Section: Resting Vo 2 Assessmentsupporting

confidence: 55%

Locomotion Mode Affects the Physiological Strain during Exercise at Walk-Run Transition Speed inElderly Men

et al. 2017

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This study investigated cardiorespiratory responses and rating of perceived exertion (RPE) during prolonged walking and running exercise performed at the walk-run transition speed (WRTS) in untrained healthy elderly men. 20 volunteers (mean±SE, age: 68.4±1.2 yrs; height: 170.0±0.02 cm; body mass: 74.7±2.3 kg) performed the following bouts of exercise: a) maximal cardiopulmonary exercise test (CPET); b) specific protocol to detect WRTS; and c) two 30-min walking and running bouts at WRTS. Expired gases were collected during exercise bouts via the Ultima CardiO metabolic analyzer. Compared to walking, running at the WRTS resulted in higher oxygen uptake (>0.27 L·min), pulmonary ventilation (>7.7 L·min), carbon dioxide output (>0.23 L·min), heart rate (>15 beats·min), oxygen pulse (>0.88 15 mL·beats), energy expenditure (>27 kcal) and cost of oxygen transport (>43 mL·kg·km·bout). The increase of overall and local RPEs with exercise duration was similar across locomotion modes (P<0.001). In all participants, %HRR and %VOR throughout walking and running bouts were around or above the gas exchange threshold. In conclusion, elderly men exhibited higher cardiorespiratory responses during 30-min bouts of running than walking at WRTS. Nevertheless, walking corresponded to relative metabolic intensities compatible with preservation or improvement of cardiorespiratory fitness and should be preferable over running at WRTS in the untrained elderly characterized by poor fitness and reduced exercise tolerance.

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Section: Resting Vo 2 Assessmentsupporting

confidence: 55%

Locomotion Mode Affects the Physiological Strain during Exercise at Walk-Run Transition Speed inElderly Men

et al. 2017

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“…However, subjects with increased fat mass may have a higher absolute resting VO 2 17. Unfortunately, due to difficulties in establishing a standardized protocol for the accurate measurement of resting VO 2 and, therefore, for its use in routine clinical practice 18, we were unable to quantify this variable in our study.…”

Section: Discussionmentioning

confidence: 93%

Influence of central obesity in estimating maximal oxygen uptake

Silva

Franklin

Araújo

2016

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OBJECTIVE:To assess the influence of central obesity on the magnitude of the error of estimate of maximal oxygen uptake in maximal cycling exercise testing.METHOD:A total of 1,715 adults (68% men) between 18-91 years of age underwent cardiopulmonary exercise testing using a progressive protocol to volitional fatigue. Subjects were stratified by central obesity into three quartile ranges: Q1, Q2-3 and Q4. Maximal oxygen uptake [mL.(kg.min)-1] was estimated by the attained maximal workload and body weight using gender- and population-specific equations. The error of estimate [mL.(kg.min)-1] and percent error between measured and estimated maximal oxygen uptake values were compared among obesity quartile ranges.RESULTS:The error of estimate and percent error differed (mean ± SD) for men (Q1=1.3±3.7 and 2.0±10.4; Q2-3=0.5±3.1 and -0.5±13.0; and Q4=-0.3±2.8 and -4.5±15.8 (p<0.05)) and for women (Q1=1.6±3.3 and 3.6±10.2; Q2-3=0.4±2.7 and -0.4±11.8; and Q4=-0.9±2.3 and -10.0±22.7 (p<0.05)).CONCLUSION:Central obesity directly influences the magnitude of the error of estimate of maximal oxygen uptake and should be considered when direct expired gas analysis is unavailable.

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“…In the laboratory, subjects laid in a calm environment for 10 min, after which the V . O 2 (mL • kg − 1 • min − 1 ) was measured for 40 min as described elsewhere [7]. The resting V .…”

Section: Methodsmentioning

confidence: 99%

Can Heart Rate Variability be used to Estimate Gas Exchange Threshold in Obese Adolescents?

et al. 2015

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This study investigated the agreement and reliability of oxygen uptake (V̇O2), V̇O2 reserve (V̇O2 R), heart rate (HR) and power output at intensities corresponding to the gas exchange threshold (GET) and heart rate variability threshold (HRVT) during maximal cardiopulmonary exercise testing (CPET) in obese and eutrophic adolescents. A further aim was to establish whether the HRVT was able to detect changes in cardio-respiratory fitness in obese adolescents after 3 months of recreational soccer practice. First, 25 obese and 10 eutrophic adolescents (ages 12-17) visited the laboratory twice to perform cycling CPET to test the reliability of CPET outcomes at GET and HRVT. Furthermore, the level of agreement between GET and HRVT was determined for a subgroup of 10 obese adolescents after performing a 3-month recreational soccer program. No significant difference was found for V̇O2, %V̇O2 R, HR and power output at the GET and HRVT (P>0.05), which were equally able to detect improvements in aerobic fitness after the soccer intervention. Correlations between GET and HRVT for V̇O2 and %V̇O2 R ranged from 0.89 to 0.95 (P<0.001) and test-retest reliability ranged from 0.59 to 0.82 (P<0.006). Overall, HRVT seems to be a reliable alternative for prescribing aerobic exercise intensity in obese adolescents.

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How long does it take to achieve steady state for an accurate assessment of resting $$ \dot{\text{V}}{\text{O}}_{2} $$ in healthy men?

Cited by 25 publications

References 27 publications

Locomotion Mode Affects the Physiological Strain during Exercise at Walk-Run Transition Speed inElderly Men

Locomotion Mode Affects the Physiological Strain during Exercise at Walk-Run Transition Speed inElderly Men

Influence of central obesity in estimating maximal oxygen uptake

Can Heart Rate Variability be used to Estimate Gas Exchange Threshold in Obese Adolescents?

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