Kinetics of oxygen uptake and heart rate at onset of exercise in children

Cooper, David; Berry, Craig W.; Lamarra, N.; Wasserman, K.

doi:10.1152/jappl.1985.59.1.211

Cited by 88 publications

(51 citation statements)

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“…HHb starts to increase following a short delay of ~ 5 -10 s (Cooper et al 1985) was identified. This time-point was identified by fitting two linear regression curves to the first 20 s of the ensemble dataset and, using custom written software and the Solver …”

Section: Discussionmentioning

confidence: 97%

Oxygen uptake kinetics in trained adolescent females

et al. 2014

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Little evidence exists with regard to the effect that exercise training has upon oxygen uptake kinetics in adolescent females. PURPOSE: The aim of the study was to compare 2 o V  and muscle deoxygenation kinetics in a group of trained (Tr) and untrained (Utr) female adolescents. METHOD: Twelve trained (6.4 ± 0.9 years training, 10.3 ± 1.4 months per year training, 5.2 ± 2.0 hours per week) adolescent female soccer players (Age: 14.6 ± 0.7 years) were compared to a group (n=8) of recreationally active adolescent girls (Age: 15.1 ± 0.6 years) of similar maturity status. Subjects underwent two, 6-min exercise transitions at a workload equivalent to 80% of lactate threshold from a 3-min baseline of 10W. All subjects had a passive rest period of 1 hour between each square-wave transition. Breath-by-breath oxygen uptake and muscle deoxygenation were measured throughout and were modelled via a monoexponential decay with a delay relative to the start of exercise. RESULT: Peak 2 o V  was significantly (p<0.05) greater in the Tr compared to the Utr (Tr: 43.2 ± 3.2 mL·kg -1 min -1 vs. Utr: 34.6 ± 4.0 mL·kg -1 min -1 ). The 2 o V  time constant was significantly (p<0.05) faster in the Tr compared to the Utr (Tr: 26 .3 ± 6.9 s vs. Utr: 35.1 ± 11.5 s). There was no inter-group difference in the time constant for muscle deoxygenation kinetics (Tr: 8.5 ± 3.0 s vs. Utr: 12.4 ± 8.3 s); a large effect size, however, was demonstrated (-0.804). CONCLUSION: Exercise training and/or genetic self-selection results in faster kinetics in trained adolescent females. The faster 2 o V  kinetics seen in the trained group may result from enhanced muscle oxygen utilisation.

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Section: Discussionmentioning

confidence: 97%

Oxygen uptake kinetics in trained adolescent females

et al. 2014

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“…moderate exercise were the same in children and adults despite slower kinetics for heart rate in the children. [91] Even under hypoxic conditions, the V . O 2 kinetics were affected in children and adults to the same degree.…”

Section: Type Iib Fibre Recruitmentmentioning

confidence: 99%

Oxygen Uptake Kinetics During Exercise

1999

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“…A useful noise-reducing technique in analyzing this type of data has been to superimpose and average data obtained at the same work intensity [the "groupmean" response. (12, 13)]. Thus, for the analysis of the ontransient Vcoz-Vc response, we calculated the slope.…”

Section: Populationmentioning

confidence: 99%

Maturation of Ventilatory Responses to 1-Minute Exercise

Armon

Zanconato

1991

Pediatr Res

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ABSTRACT. To test the hypothesis that ventilatory responses to exercise mature during growth in healthy children, we examined C 0 2 production (VCO~) and minute ventilation (VE) before, during, and for 10 min after 1-min bursts of cycle ergometry exercise. Ten children (range: 7-11 y old) and 13 adults (26-42 y old) exercised at work rates corresponding to 50 and 80% of the anaerobic or lactate threshold, 50% of the difference between anaerobic threshold and maximum 0 2 consumption, 100% of maximum O2 consumption, and 125% of maximum 0 2 consumption (125% max). Gas exchange was measured breath by breath. Children recovered faster from high-intensity (above anaerobic threshold) exercise as judged by the time constant of single exponential curve-fits to postexercise Vco2 (55 f 10 s (1 SD) at 125%. max in children compared with 92 2 17 s at 125% max in adults; p < 0.0011 and VE (58 f 10 s at 125% max in children compared with 125 & 37 s in adults, p c 0:001). Although we found no significant difference between VCOZ and VE recovery times in children, VE was significantly slower than Vco2 in adults for highintensity exercise. Moreover, recovery times in adults increased with work intensity but were independent of them in children. Whereas the C 0 2 costs [calculated as total C 0 2 produced above baseline per unit work done (mL. J-I)] increased with work intensity in adults, no similar significant relationship was observed in children. Finally, at 125% max, the ratio of C 0 2 cost to O2 cost was 1.48 f 0.07, less than the ratio in adults (1.83 -C 0.07, p < 0.01).These results demonstrate marked differences in dynamic ventilatory response to short bursts of exercise reflecting maturation of both respiratory control and cellular metabolic factors. (Pediatr Res 29: 362-368, 1991) Abbreviations AT, anaerobic threshold VCOZ, C 0 2 production VE, minute ventilation VO~, 0 2 consumption Petco2, end-tidal Pco2 Vo2max, maximum O2. uptake A, difference between V02max and AT % max, % of Vo2max 7Vco2, time constant for V C O~ recovery 7VE, time constant for Ve recovery Ventilation in humans is regulated to maintain cellular homeostasis of COz and bicarbonate when the metabolic rate changes. The link between cellular activity and ventilation is, in large part, dependent on the distribution and transport of .COz molecules (l,2). There is evidence that the linkage between Vco2 and VE undergoes a process of maturation during growth, i.e. there is a difference between children and adults in the ventilatory response to changes in metabolic rate (3). The magnitude and mechanisms of these differences have not been fully elucidated, most likely because studying gas exchange in ways that are acceptable to children is difficult and because there are no uniform approaches to normalizing physiologic responses in subjects of widely different sizes. In this study, we employed an exercise protocol specifically designed for the behavioral characteristics of children, and the data were normalized and analyzed in a manner that facilitated compar...

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Kinetics of oxygen uptake and heart rate at onset of exercise in children

Cited by 88 publications

References 0 publications

Oxygen uptake kinetics in trained adolescent females

Oxygen uptake kinetics in trained adolescent females

Oxygen Uptake Kinetics During Exercise

Maturation of Ventilatory Responses to 1-Minute Exercise

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