Show simple item record

dc.contributor.authorMcNarry, MA
dc.contributor.authorFarr, C
dc.contributor.authorMiddlebrooke, A
dc.contributor.authorWelford, D
dc.contributor.authorBreese, Brynmor C.
dc.contributor.authorArmstrong, N
dc.contributor.authorBarker, AR
dc.date.accessioned2015-07-13T14:57:07Z
dc.date.issued2014-12-30
dc.description.abstractPURPOSE: To characterise changes in deoxyhemoglobin ([HHb]) response dynamics in boys and girls during ramp incremental exercise to investigate whether the reduced peak oxygen uptake (peakV˙O2) in girls is associated with a poorer matching of muscle O2 delivery to muscle O2 utilisation, as evidenced by a more rapid increase in [HHb]. METHODS: 52 children (31 boys, 9.9 ± 0.6 years, 1.38 ± 0.07 m, 31.70 ± 5.78 kg) completed ramp incremental exercise on a cycle ergometer during which pulmonary gas exchange and muscle oxygenation parameters were measured. RESULTS: When muscle [HHb] was expressed against absolute work rate and V˙O2, girls had an earlier change in [HHb] as evidenced by the lower c/d parameter (Girls: 54 ± 20 W vs Boys: 67 ± 19 W, P=0.023; Girls: 0.82 ± 0.28 L·min vs. Boys: 0.95 ± 0.19 L·min, P=0.055) and plateau (Girls: 85 ± 12 W vs. Boys: 99 ± 18 W, P=0.031; Girls: 1.02 ± 0.25 L·min vs. Boys: 1.22 ± 0.28 L·min, P=0.014). However, when expressed against relative work-rate or V˙O2, there were no sex differences in [HHb] response dynamics (all P>0.20). Significant correlations were observed between absolute and fat-free mass normalised peak V˙O2 and the HHb c/d and plateau parameters when expressed against absolute work-rate or V˙O2. Furthermore, when entered into a multiple regression model, the [HHb] plateau against absolute V˙O2 contributed 12% of the variance in peak V˙O2 after adjusting for fat-free mass, gas exchange threshold, and body fatness (model R =0.81, P<0.001). CONCLUSION: The sex-difference in peak V˙O2 in 9-10 year old children is, in part, related to sex-specific changes in muscle O2 extraction dynamics during incremental exercise.en_GB
dc.identifier.citationVol. 47 (9), pp. 1877-1884
dc.identifier.doi10.1249/MSS.0000000000000609
dc.identifier.urihttp://hdl.handle.net/10871/17891
dc.language.isoenen_GB
dc.publisherAmerican College of Sports Medicine (ACSM)en_GB
dc.relation.urlhttp://www.ncbi.nlm.nih.gov/pubmed/25551403en_GB
dc.rights.embargoreasonPublisher embargo 12 monthsen_GB
dc.subjectAerobic functionen_GB
dc.titleAerobic function and muscle deoxygenation dynamics during ramp exercise in childrenen_GB
dc.typeArticleen_GB
dc.identifier.issn0195-9131
dc.relation.isreplacedby10871/19770
dc.relation.isreplacedbyhttp://hdl.handle.net/10871/19770
pubs.declined2016-02-23T20:11:13.742+0000
pubs.deleted2016-02-23T20:11:13.791+0000
pubs.merge-to10871/19770
pubs.merge-tohttp://hdl.handle.net/10871/19770
dc.descriptionThis is a non-final version of an article published in final form in Medicine and Science in Sports and Exerciseen_GB
dc.identifier.journalMedicine and Science in Sports and Exerciseen_GB


Files in this item

This item appears in the following Collection(s)

Show simple item record