dc.contributor.author | Willcocks, RJ | |
dc.contributor.author | Fulford, J | |
dc.contributor.author | Armstrong, N | |
dc.contributor.author | Barker, AR | |
dc.contributor.author | Williams, CA | |
dc.date.accessioned | 2015-04-30T09:21:00Z | |
dc.date.issued | 2014-04 | |
dc.description.abstract | Children and adolescents are less susceptible to muscle fatigue during repeated bouts of high-intensity exercise than adults, but the physiological basis for these differences is not clear. The purpose of the current investigation was to investigate the muscle metabolic responses, using 31-phosphorus magnetic resonance spectroscopy, during fatiguing isometric quadriceps exercise in 13 adolescents (7 females) and 14 adults (8 females). Participants completed 30 maximal voluntary contractions (6-s duration) separated by 6 s of rest. Fatigue was quantified as the relative decrease in force over the test. Fatigue was not significantly different with age (p = 0.20) or sex (p = 0.63). Metabolic perturbation (change in phosphocreatine, inorganic phosphate, and ADP concentrations) was significantly greater in adults compared with adolescents; no sex effects were present. Muscle pH did not differ with age or sex. Phosphocreatine recovery following exercise was not significantly different with age (p = 0.27) or sex (p = 0.97) but a significant interaction effect was present (p = 0.04). Recovery tended to be faster in boys than men but slower in girls than women, though no significant group differences were identified. The results of this study show that at a comparable level of muscle fatigue, the metabolic profile is profoundly different between adolescents and adults. | en_GB |
dc.identifier.citation | Applied Physiology, Nutrition, and Metabolism, 2014, Vol. 39 (4), pp. 439 - 445 | en_GB |
dc.identifier.doi | 10.1139/apnm-2013-0192 | |
dc.identifier.uri | http://hdl.handle.net/10871/17070 | |
dc.language.iso | en | en_GB |
dc.publisher | NRC Research Press | en_GB |
dc.relation.url | http://www.ncbi.nlm.nih.gov/pubmed/24669985 | en_GB |
dc.rights | Copyright © 2014, NRC Research Press | en_GB |
dc.title | Muscle metabolism during fatiguing isometric quadriceps exercise in adolescents and adults. | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2015-04-30T09:21:00Z | |
dc.identifier.issn | 1715-5320 | |
exeter.place-of-publication | Canada | |
dc.description | This is the accepted, peer reviewed version of the article, which has been published in final form at doi: 10.1139/apnm-2013-0192. | en_GB |
dc.identifier.journal | Applied Physiology, Nutrition, and Metabolism | en_GB |