Changes in interstitial noradrenaline, trapezius muscle activity and oxygen saturation during low-load work and recovery
2009 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 107, no 1, 31-42 p.Article in journal (Refereed) Published
Both physical as well as mental demands result in an increased activity in the sympathetic nervous system (SNS) with changes in blood-pressure and heart-rate. Through local release of catecholamines, e.g. noradrenaline (NAd) SNS exerts various actions at the muscle level. The aims of this study were to investigate the effects of low-load repetitive work alone and in combination with mental demands on local muscle interstitial noradrenaline concentration [NAd]i, muscle activity and oxygenation, assessed with microdialysis, surface electromyography, and near-infrared spectroscopy, respectively. Healthy females (n = 15) were exposed to (1) 30 min repetitive work (RW) and (2) 30 min repetitive work with superimposed mental load (RWML) on two different occasions. Muscle [NAd]i and muscle activity increased significantly in response to RW, but did not increase further during RWML. For RW, [NAd]i was found to be inversely correlated to muscle activity. Oxygenation decreased significantly during work, independently of occasion. Our findings indicate that low-load work causes significantly increased trapezius muscle [NAd]i in healthy females, and short periods of superimposed mental load do not add to this increase and further, that both muscle activity and oxygenation were unaffected by the superimposed mental load.
Place, publisher, year, edition, pages
2009. Vol. 107, no 1, 31-42 p.
Microdialysis, Near-infrared spectroscopy, Electromyography, Mental load, Subjective ratings, Healthy females
Sport and Fitness Sciences Physiology
IdentifiersURN: urn:nbn:se:umu:diva-2641DOI: 10.1007/s00421-009-1095-5OAI: oai:DiVA.org:umu-2641DiVA: diva2:140865