Finmotorisk isometrisk kraftkontroll i hånd og fingre ved nedkjøling
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- Institutt for biologi 
Background: People with outdoor occupations will large parts of the year be exposed to low ambient temperatures. Prolonged exposure to low temperatures can impair performance in several ways, such as reduced muscle function and fine motor control, which again could affect the execution of work-related tasks.Aim: The aim of this study was to develop new knowledge about how moderate cold exposure at 8°C will affect isometric fine motor control in hand and fingers.Methods: Fifteen men performed a test protocol with exposure to cold (8°C) and neutral (25°C) ambient temperature for 75 minutes, dressed in thermal underwear. The test protocol consisted of three cycles, each measuring force control, subjective rating of perceived thermal sensation, and oxygen consumption. Skin temperatures, rectal temperature and heart rate were measured continuously through the test protocol. For each test cycle measurements of force control were performed for grip and finger at intensity levels of 10% and 30% of maximum voluntary contraction.Results: There was a significant reduction in skin temperatures at exposure to 8°C compared to 25°C, without a change in rectal temperature. Exposure to cold had little or no effect on force control in grip or finger, regardless of intensity level. No correlations were found between skin temperature and fine motor control. Significant level of shivering was reported at exposure to 8°C compared to 25°C, with metabolic rate significantly increasing towards the end of the exposure time.Conclusion: Isometric fine motor control in hand and finger does not appear to be affected by reduced skin temperatures or increased level of shivering during exposure to moderate cold. Thus, the execution of work-related tasks like this will not be impaired by exposure to moderate cold, however, people will shiver and experience discomfort.