Katherine Dahl

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Circadian temperature, cortisol, and thyroid-stimulating hormone (TSH) rhythms during a constant routine were assessed in 6 female controls and 6 female patients with hypersomnic winter depression (seasonal affective disorder, SAD) before and after morning bright light treatment. After sleep was standardized for 6 days, the subjects were sleep-deprived and(More)
To establish the importance of standardization of the facilitation of central motor conduction measured by magnetic stimulation we studied the effect of increasing voluntary muscle contraction on the central motor conduction time (CMCT) and motor evoked potential (MEP) amplitudes for 3 upper and 2 lower limb muscles. MEPs were elicited by magnetic(More)
The onset of melatonin secretion under dim light conditions (DLMO) and the circadian temperature rhythm during a constant routine were assessed in 6 female controls and 6 female patients with winter depression (seasonal affective disorder, SAD) before and after bright light treatment. After sleep was standardized for 6 days, the subjects were sleep-deprived(More)
OBJECTIVE To determine whether pressor doses of vasopressin impair organ blood flow in endotoxic shock. DESIGN Graded doses of vasopressin or phenylephrine, starting at the clinically recommended doses for pressure support in septic shock, were intravenously infused during endotoxic shock. SETTING University hospital surgical research laboratory. (More)
A standardized magnetic stimulation procedure for evaluation of central and peripheral motor pathways is described together with the results of motor evoked potential (MEP) recordings from 6 muscles in 50 healthy volunteers aged 18 to 60 years. Facilitation of the neuronal pathways was standardized using the integrated electric activity of the EMG as a(More)
In the brachial biceps muscle of 17 patients with myopathy and of 14 patients with neurogenic disorders the integrated electrical activity and number of zero crossings per unit time were analysed in 3 sites of each muscle every 100 msec during a gradual increase in force from zero to maximum within 10 sec. The analysis of integrated electrical activity(More)
The electrical activity of the brachial biceps muscle from 31 patients with neuromuscular diseases were quantified during a gradual increase in force from zero to maximum within 10 sec. In patients with myopathy the ratio of potential reversals per 100 msec (turns) to mean amplitude was increased more often at 10% and 20% of maximum force than at greater(More)
The integrated electrical activity, the number of zero crossings and the number of turns, the mean amplitude and the ratio between them, of the electrical activity were compared in the brachial biceps muscle and the anterior tibial muscle of 20 controls. The electrical activity and force were analysed every 100 msec during a gradual increase in force from(More)
Specifications are given: (i) for a 3-channel digital memory that, when connected to an inkjet writer, allows action potentials from muscle and nerve to be recorded without distortion (upper limiting frequency 10,000 Hz); (ii) for a 14-channel digital memory connected to a 14-channel inkjet writer for the measurement of the territory of the motor units by(More)