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DC Field | Value | Language |
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dc.contributor.author | Molgat-Seon, Y | - |
dc.contributor.author | Dominelli, PB | - |
dc.contributor.author | Ramsook, AH | - |
dc.contributor.author | Schaeffer, MR | - |
dc.contributor.author | Romer, LM | - |
dc.contributor.author | Road, JD | - |
dc.contributor.author | Guenette, JA | - |
dc.contributor.author | Sheel, AW | - |
dc.date.accessioned | 2018-04-25T14:39:06Z | - |
dc.date.available | 2018-04-25T14:39:06Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Medicine and Science in Sports and Exercise | en_US |
dc.identifier.issn | 1530-0315 | - |
dc.identifier.issn | 0195-9131 | - |
dc.identifier.uri | https://insights.ovid.com/crossref?an=00005768-900000000-96922 | - |
dc.identifier.uri | http://bura.brunel.ac.uk/handle/2438/16135 | - |
dc.description.abstract | Purpose: Characterize the effects of age, sex, and their interaction on inspiratory muscle activation patterns during exercise. Methods: Twenty younger (20-30y, n=10 women) and twenty older (60-80y, n=10 women) subjects performed an incremental cycle exercise test. Electromyography of the scalene (EMGsca) and sternocleidomastoid (EMGscm) muscles were measured using skin surface electrodes, while diaphragm electromyography (EMGdi) and esophageal and transdiaphragmatic pressures were measured using an esophageal catheter. Electromyography data were transformed into root-mean-square with a 100ms time constant. Esophageal (PTPes) and diaphragmatic (PTPdi) pressure-time products were used as indices of total inspiratory muscle pressure production and diaphragmatic pressure production, respectively. Results: At absolute minute ventilations (V E), women and older subjects had greater EMGdi than men and younger subjects, respectively (all p<0.05), but no differences were noted when V E was expressed in relative terms (all p>0.05). Women had greater EMGsca activity than men at absolute and relative levels of V E (all p<0.05). Older subjects had greater EMGsca than younger subjects when V E was expressed relative (all p<0.05) but not absolute terms (all p>0.05). At absolute and relative levels of V E, women and older subjects had greater EMGscm than men and younger subjects, respectively (all p<0.05). Women and older subjects had a greater PTPdi/PTPes at a V E of 70 l·min-1 than men and younger subjects, respectively (both p<0.05), but no differences were noted when V E was expressed in relative terms (all p>0.05). No significant interactions between age and sex were noted (all p>0.05). Conclusion: Age and sex significantly affect inspiratory muscle activation patterns during exercise; however, the extent of the effects depends on whether comparisons are made at a solute or relative V E. | en_US |
dc.description.sponsorship | This study was supported by the British Columbia Lung Association (BCLA). YMS, PBD, and AHR were supported by graduate scholarships from the Natural Sciences and Engineering Research Council of Canada (NSERC). PBD and MRS were supported by fellowships from the University of British Columbia and BCLA. JAG was supported by a Scholar Award from the Michael Smith Foundation for Health Research, a New Investigator Award from the Providence Health Care Research Institute and St. Paul’s Hospital Foundation, and a Canadian Institutes of Health Research Clinical Rehabilitation New Investigator Award. | en_US |
dc.language.iso | en | en_US |
dc.publisher | LIPPINCOTT, WILLIAMS & WILKINS | en_US |
dc.subject | Aging | en_US |
dc.subject | Diaphragm | en_US |
dc.subject | Electromyography | en_US |
dc.subject | Respiratory mechanics | en_US |
dc.subject | Scalene | en_US |
dc.subject | Sternocleidomastoid | en_US |
dc.title | Effects of Age and Sex on Inspiratory Muscle Activation Patterns During Exercise | en_US |
dc.type | Article | en_US |
dc.identifier.doi | https://doi.org/10.1249/MSS.0000000000001648 | - |
dc.relation.isPartOf | Journal of Applied Physiology | - |
pubs.publication-status | Accepted | - |
Appears in Collections: | Dept of Life Sciences Embargoed Research Papers |
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FullText.pdf | 12 month embargo | 2.32 MB | Adobe PDF | View/Open |
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