Changes in interstitial noradrenaline, trapezius muscle activity and oxygen saturation during low-load work and recovery

Flodgren, Gerd,1961-Högskolan i Gävle,Centrum för belastningsskadeforskning,Department of Surgical and Perioperative Sciences, Sports Medicine Unit, Umeå University, Umeå, Sweden; Institute of Health and Society, Newcastle University, Newcastle upon Tyne, United Kingdom (författare)

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.

Crenshaw, Albert G.Högskolan i Gävle,Centrum för belastningsskadeforskning(Swepub:hig)acw (författare)
Gref, MargaretaUmeå universitet,Klinisk fysiologi,Department of Surgical and Perioperative Sciences, Clinical Physiology Unit, Umeå University, Umeå, Sweden(Swepub:umu)magr0087 (författare)
Fahlström, MartinUmeå universitet,Rehabiliteringsmedicin,Department of Surgical and Perioperative Sciences, Sports Medicine Unit, Umeå University, Umeå, Sweden; Department of Community Medicine and Rehabilitation, Department of Rehabilitation Medicine, Umeå University, Umeå, Sweden(Swepub:umu)manfam96 (författare)
Högskolan i GävleCentrum för belastningsskadeforskning (creator_code:org_t)

Ingår i:European Journal of Applied Physiology: Springer Science and Business Media LLC107:1, s. 31-421439-63191439-6327

Av författaren/redakt...: Flodgren, Gerd, ...; Crenshaw, Albert ...; Gref, Margareta; Fahlström, Marti ...

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