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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
4 Pt 1
|
| pubmed:dateCreated |
1991-8-19
|
| pubmed:abstractText |
To test the hypothesis that ventilatory responses to exercise mature during growth in healthy children, we examined CO2 production (VCO2) 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 O2 consumption, 100% of maximum O2 consumption, and 125% of maximum O2 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 +/- 10 s (1 SD) at 125%. max in children compared with 92 +/- 17 s at 125% max in adults; p less than 0.001] and VE (58 +/- 10 s at 125% max in children compared with 125 +/- 37 s in adults, p less than 0.001). Although we found no significant difference between VCO2 and VE recovery times in children, VE was significantly slower than VCO2 in adults for high-intensity exercise. Moreover, recovery times in adults increased with work intensity but were independent of them in children. Whereas the CO2 costs [calculated as total CO2 produced above baseline per unit work done (mL.J-1)] increased with work intensity in adults, no similar significant relationship was observed in children.(ABSTRACT TRUNCATED AT 250 WORDS)
|
| pubmed:grant | |
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Apr
|
| pubmed:issn |
0031-3998
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
29
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
362-8
|
| pubmed:dateRevised |
2008-11-21
|
| pubmed:meshHeading |
pubmed-meshheading:1906595-Adult,
pubmed-meshheading:1906595-Age Factors,
pubmed-meshheading:1906595-Carbon Dioxide,
pubmed-meshheading:1906595-Child,
pubmed-meshheading:1906595-Exercise,
pubmed-meshheading:1906595-Female,
pubmed-meshheading:1906595-Humans,
pubmed-meshheading:1906595-Male,
pubmed-meshheading:1906595-Oxygen Consumption,
pubmed-meshheading:1906595-Pulmonary Gas Exchange,
pubmed-meshheading:1906595-Respiration,
pubmed-meshheading:1906595-Respiratory Physiological Phenomena,
pubmed-meshheading:1906595-Respiratory System
|
| pubmed:year |
1991
|
| pubmed:articleTitle |
Maturation of ventilatory responses to 1-minute exercise.
|
| pubmed:affiliation |
Department of Pediatrics, Harbor-UCLA Medical Center, Torrance 90509.
|
| pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.,
Research Support, Non-U.S. Gov't
|