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Biomedical subjects

B Jonsson

Publications and source records attributed to B Jonsson.

At least 145 records · Page 8Linked to original sources
PubMed1978

Kinesiology: with special reference to electromyographic kinesiology.

A brief review of kinesiological research with special reference to electromyographic kinesiology is presented. The review deals with, among other things, the use of electromyography in functional anatomical studies, in biomechanical studies on muscular force, in neurophysiological studies on muscular fatigue, in applied kinesiologic studies and in vocational studies.

Biomechanical Phenomena↗
PubMed1977

Haemodynamic effects of different beta blockers in angina pectoris.

Beta-blocking agents with partial agonist activity seem to reduce heart rate at rest slightly less than those without this property. Cardio-selective drugs have no effect on stroke volume at rest contrary to the non-selective ones which will reduce it somewhat. This difference is abolished during exercise. The only difference seen during work between different beta-blockers is the effect on the peripheral vascular resistance. The selective drugs lower the arterial pressure with unchanged resistance.

Adrenergic beta-Antagonists↗
PubMed1977

Electrocardiographic findings in men and women aged 18 to 65.

In an epidemiological study--the REBUS study--about 2500 men and women aged 18 to 65 underwent an electrocardiographic (ECG) examination at rest and a subsample of about 1000 persons also performed an ECG exercise test. The ECG recordings were coded according to the modified Minnesota code (2). At rest, 55% of the population had normal ECGs. In the subsample the figure was 65%, indicating a certain selection. During and/or after the exercise test 80% of the men and 70% of the women had no major ST- and T-wave changes, arrhythmias or ectopic beats. In both men and women the percentage of abnormal changes in the exercise ECG rose with age, for the men from 45 years, and for the women from the age of 35. ST depressions were most common abnormal changes recorded. At rest, 20% of the women and 9% of the men had ST depressions. The corresponding figures (major and minor changes) during and/or after the exercise test were 78% and 60% for the women and the men respectively. Out of 184 major ST depressions recorded during the exercise test (codes 4.1--4.4) 14 (7%) were not present immediately after the test. During and/or after the exercise test, 8% of the men and 20% of the women, having no ST changes at rest, had ST changes of the major type. Those subjects who had arrhythmias or ectopic beats at rest, had in general no such changes during and/or after the exercise test.

Adolescent↗
PubMed1977

Endurance limit of force in long-term intermittent static contractions.

The relationship between endurance time and the mean force of contraction was investigated in intermittent and sustained static contractions over a long period of time (60 min). For intermittent static contractions the endurance limit of the mean force of contraction was found to be 14.0%, and for sustained static contractions it was 7.9% of the maximal force of contraction. Weak subjects appear to have a higher endurance limit of force than strong subjects.

Adult↗
PubMed1976

Yersinia enterocolitica in borwn trout (Salmo trutta L.) from Norway.

In this pilot study, 20 brown trout (Salmo trutta L.) from one area in Western Norway were investigated for the presence of Yersinia enterocolitica (Y.e.). Three strains were isolated from three of these trout. All strains were classified as Y.e. on the basis of biochemical properties. One of the strains showed antigenic relationship to Y.e O-serotype 17. A second strain was antigenically related both to Y.e. and Y. pseudotuberculosis: Agglutination against Y.e. O-antisera 4-33, 18, and 21, was obtained and against Y. pseudotuberculosis O-antiserum II B. The third culture was not agglutinated by our sera. The biochemical properties of the strains are presented. The capability of fish to spread Y.e. is discussed.

Animals↗
PubMed1976

Design of exercise test, with special reference to heart patients.

Estimation of exercise tolerance in patients with heart disease and significant symptoms can usually not be expressed in terms of maximal oxygen uptake or power at a fixed heart rate calculated from a 'steady state' exercise test. The exercise tolerance can be expressed only by the maximal power developed, when limited by symptoms. For this purpose the level of tolerance is better assessed by a test with small increments and short duration of each work load. In clinical practice this type of almost continuous increase in load was found to be particularly useful in patients with ischaemic heart disease. Comparative studies showed that the work per heart beat at equal loads is significantly higher in the test with continuous increase in load than in the test with steps of 6 minutes duration, both in normal subjects and in heart patients. The difference, however, is small (7%) and for practical purposes these tests have equal validity as a measure of the circulatory capacity.

Adult↗
PubMed1975

Effect of quinidine on maintaining sinus rhythm after conversion of atrial fibrillation or flutter. A multicentre study from Stockholm.

In a controlled study comprising 176 patients, quinidine in the form of Kinidin Durules was found to reduced significantly the recurrence of the atrial fibrillation during a 1-year follow-up period after successful electric shock conversion. After one year, 51 per cent (52/101) of the patients in the quinidine group, and 28 per cent (21/75) in the control group remained in sinus rhythm (P smaller than 0.001). No less than 43 per cent of the patients converted to sinus rhythm during treatment with maintenance doses of quinidine sulphate before intended DC conversion. Gastrointestinal side-effects were not uncommon, and caused interruption of quinidine treatment in some cases.

Adult↗
PubMed1975

The effect of dantrium on spasticity of hemiplegic patients.

The effect of a new peripherally acting muscle relaxant drug Dantrium, on spasticity tested on 11 hemiplegic patients. The effect was evaluated both with regular clinical examination and with electromyographic technique. The latter concerned a quantitative analysis of the patients' voluntary control of fine neuromuscular activity both with and without the drug. The results indicated that spasticity was initially markedly reduced in the majority of the patients without, however, meaningfully increasing the daily-living functions of the patients. After a few months, the medication could be discontinued without any immediate increase in the spasticity. No severe side-effects were noted. In some cases, the medication had to be discontinued due to marked tiredness. Electromyographically, it was found that the ability of the patients to control fine neuromuscular activity with the paretic muscles was increased significantly with Dantrium, indicating that the reduction of the spasticity increased the ability for fine control of the muscles.

Adolescent↗
PubMed1975

The effect of Dantrium on spasticity in spinal cord injuries.

The effect of a new, peripherally acting muscle relaxant drug (Dantrium) on spasticity was tested on 6 patients with spinal cord injuries. The effect was evaluated both by regular clinical examination and with an electromyographic technique. The latter concerned a quantitative analysis of the patients' ability to voluntarily control fine neuromuscular activity both with and without the drug. The results indicated that the spasticity was initially markedly reduced in all patients; in one case so markedly that the stability of the trunk was lost. Electromyographically it was found that the ability of the patients to relax the muscles was increased with Dantrium.

Administration, Oral↗