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480 results on '"Hisdal, Jonny"'

53. Effect of high-intensity exercise on cardiorespiratory fitness, cardiovascular disease risk and disease activity in patients with inflammatory joint disease: protocol for the ExeHeart randomised controlled trial

Author

Nordén, Kristine Røren, primary, Dagfinrud, Hanne, additional, Semb, Anne Grete, additional, Hisdal, Jonny, additional, Viktil, Kirsten K, additional, Sexton, Joseph, additional, Fongen, Camilla, additional, Skandsen, Jon, additional, Blanck, Thalita, additional, Metsios, George S, additional, and Tveter, Anne Therese, additional

Published
2022
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54. Diabetic foot assessment using skin impedance in a custom made sensor-sock

Author

Tronstad, Christian, primary, Amini, Maryam, additional, Olesen, Eline, additional, Qvigstad, Elisabeth, additional, Pabst, Oliver, additional, Martinsen, Tormod, additional, Abie, Sisay M., additional, Martinsen, Ørjan G., additional, Hisdal, Jonny, additional, Jenssen, Trond G., additional, and Kalvøy, Håvard, additional

Published
2022
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63. sj-docx-1-JVA-10.1177_11297298211060960 ��� Supplemental material for Validation of a novel ultrasound Doppler monitoring device (earlybird) for measurements of volume flow rate in arteriovenous fistulas for hemodialysis

Author

Pettersen, Erik Mulder, Avdal, J��rgen, Fiorentini, Stefano, Salvesen, ��yvind, Hisdal, Jonny, Torp, Hans, and Seternes, Arne

Subjects
Cardiology
Abstract

Supplemental material, sj-docx-1-JVA-10.1177_11297298211060960 for Validation of a novel ultrasound Doppler monitoring device (earlybird) for measurements of volume flow rate in arteriovenous fistulas for hemodialysis by Erik Mulder Pettersen, J��rgen Avdal, Stefano Fiorentini, ��yvind Salvesen, Jonny Hisdal, Hans Torp and Arne Seternes in The Journal of Vascular Access

Published
2021
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64. Core Temperature during Cold-Water Triathlon Swimming

Author

Høiseth, L.Ø., Melau, Jorgen, Bonnevie-Svendsen, Martin, Nyborg, C.J., Eijsvogels, T.M.H., Hisdal, Jonny, Høiseth, L.Ø., Melau, Jorgen, Bonnevie-Svendsen, Martin, Nyborg, C.J., Eijsvogels, T.M.H., and Hisdal, Jonny

Abstract

Contains fulltext : 238759.pdf (Publisher’s version ) (Open Access)

Published
2021

69. Factors mediating the pressor response to isometric muscle contraction: An experimental study in healthy volunteers during lower body negative pressureFactors mediating the pressor response to isometric muscle contraction: An experimental study in healthy volunteers during lower body negative pressure

Author

Stens, Niel A., Hisdal, Jonny, Bakke, Espen, Kaur, Narinder, Sharma, Archana, Stranden, Einar, Thijssen, Dick H.J., and Høiseth, Lars Øivind

Abstract

Whilst both cardiac output (CO) and total peripheral resistance (TPR) determine mean arterial blood pressure (MAP), their relative importance in the pressor response to isometric exercise remains unclear. This study aimed to elucidate the relative importance of these two different factors by examining pressor responses during cardiopulmonary unloading leading to step-wise reductions in CO. Hemodynamics were investigated in 11 healthy individuals before, during and after two-minute isometric exercise during lower body negative pressure (LBNP; -20mmHg and -40mmHg). The blood pressure response to isometric exercise was similar during normal and reduced preload, despite a step-wise reduction in CO during LBNP (-20mmHg and -40mmHg). During -20mmHg LBNP, the decreased stroke volume, and consequently CO, was counteracted by an increased TPR, while heart rate (HR) was unaffected. HR was increased during -40 mmHg LBNP, although insufficient to maintain CO; the drop in CO was perfectly compensated by an increased TPR to maintain MAP. Likewise, transient application of LBNP (-20mmHg and -40mmHg) resulted in a short transient drop in MAP, caused by a decrease in CO, which was compensated by an increase in TPR. This study suggests that, in case of reductions of CO, changes in TPR are primarily responsible for maintaining the pressor response during isometric exercise. This highlights the relative importance of TPR compared to CO in mediating the pressor response during isometric exercise.

Published
2020

71. Perioperative Microcirculatory Changes Detected with Gastroscopy Assisted Laser Doppler Flowmetry and Visible Light Spectroscopy in Patients with Median Arcuate Ligament Syndrome

Author

Berge,Simen Tveten, Safi,Nathkai, Medhus,Asle W, Sundhagen,Jon O, Hisdal,Jonny, Kazmi,Syed SH, Berge,Simen Tveten, Safi,Nathkai, Medhus,Asle W, Sundhagen,Jon O, Hisdal,Jonny, and Kazmi,Syed SH

Abstract

Simen Tveten Berge,1 Nathkai Safi,2 Asle W Medhus,3 Jon O Sundhagen,1 Jonny Hisdal,1,2 Syed SH Kazmi1,2 1Department of Vascular Surgery, Oslo University Hospital HF, Oslo, Norway; 2Faculty of Medicine, University in Oslo, Oslo, Norway; 3Department of Gastroenterology, Oslo University Hospital HF, Oslo, NorwayCorrespondence: Simen Tveten BergeDepartment of Vascular Surgery, Oslo University Hospital HF, Aker, Mail box: 4959 Nydalen, Oslo 0424, NorwayTel +47 97 72 32 20Email simen_berge@outlook.comSyed SH KazmiDepartment of Vascular Surgery, Oslo University Hospital HF, Oslo 0586, NorwayTel +47 92468309Email sshkazmi@gmail.comPurpose: Physiological tests may aid in diagnosing median arcuate ligament syndrome (MALS). MALS is a symptomatic compression of the celiac artery causing symptoms similar to chronic mesenteric ischemia (CMI) of atherosclerotic etiology. Simultaneous use of visible light spectroscopy (VLS) and laser doppler flowmetry (LDF) during upper endoscopy may detect microcirculatory changes in these patients.Patients and Methods: In a single-center, prospective comparative cohort, 25 patients were evaluated for MALS. Patients with a consensus diagnosis of MALS (n=15) underwent a gastroscopy assisted, transmucosal microcirculatory assessment with LDF and VLS. Results were compared to individuals with normal intestinal circulation (n=38) evaluated with duplex ultrasonography, and to patients with chronic mesenteric ischemia (n=32). Treatment response was evaluated clinically at 1, 3, 6, and 12 months, and with ultrasound, VLS and LDF at three months. Health-related quality of life (QoL) was assessed with Euroqol (EQ-5D-5L), preoperatively, and 12 months postoperatively.Results: Preoperative mean transmucosal oxygen saturation was significantly lower in patients with MALS (SO2 76± 6), as compared to healthy individuals (SO2 81± 4), p=0.02. An overall significant improvement in SO2 after surgical decompression of the celiac artery was foun

Published
2020

84. Left ventricular dysfunction in COPD without pulmonary hypertension

Author

Hilde, Janne M., primary, Hisdal, Jonny, additional, Skjørten, Ingunn, additional, Hansteen, Viggo, additional, Melsom, Morten N., additional, Grøtta, Ole J., additional, Småstuen, Milada C., additional, Seljeflot, Ingebjørg, additional, Arnesen, Harald, additional, Humerfelt, Sjur, additional, and Steine, Kjetil, additional

Published
2020
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93. Skin impedance in a sensor-sock for diabetic foot assessment.

Author

Tronstad, Christian, Amini, Maryam, Olesen, Eline, Pabst, Oliver, Martinsen, Tormod, Abie, Sisay M., Martinsen, Ørjan G., Kalvøy, Håvard, Hisdal, Jonny, Jenssen, Trond G., and Qvigstad, Elisabeth

Subjects
DIABETIC foot, FOOT, DIABETIC neuropathies, IMPEDANCE spectroscopy, TOES
Abstract

Diabetic peripheral neuropathy (DPN) leads to several changes in the skin, and some of these may influence the skin impedance spectrum. In the present study we have developed a prototype solution for skin impedance spectroscopy at selected skin sites (big toe pulp, heel and toe ball) that was tested in a pilot study on five patients with DPN and five healthy controls. At the big toe, most of the controls had markedly lower impedance than the DPN group, especially in the range of 1-100 kHz. The separation between the groups seemed to be weaker at the heel and weakest at the toeball. The results may indicate that monitoring of the skin impedance spectrum may be a method for detection of skin changes associated with DPN, encouraging further studies with the big toe sensor in particular. [ABSTRACT FROM AUTHOR]

Published
2022

94. Associations between changes in precerebral blood flow and cerebral oximetry in the lower body negative pressure model of hypovolemia in healthy volunteers

Author

Hisdal, Jonny, Landsverk, Svein Aslak, Hoff, Ingrid Elise, Hagen, Ove Andreas, Kirkebøen, Knut Arvid, and Høiseth, Lars Øivind

Subjects
Adult, Male, Physiology, Cerebrovascular Diseases, Science, Hypovolemia, Cardiology, Blood Pressure, Cardiovascular Analysis, Research and Analysis Methods, Vascular Medicine, Young Adult, Blood Flow, Medicine and Health Sciences, Humans, Oximetry, Cardiac Output, Vertebral Artery, Cerebral Blood Flow Assay, Scalp, Multidisciplinary, Hemodynamics, Biology and Life Sciences, Correction, Ultrasonography, Doppler, Arteries, Healthy Volunteers, Body Fluids, Stroke, Oxygen, Chemistry, Blood, Bioassays and Physiological Analysis, Neurology, Cerebrovascular Circulation, Physical Sciences, Cardiovascular Anatomy, cardiovascular system, Blood Vessels, Medicine, Female, Anatomy, Head, Blood Flow Velocity, Carotid Artery, Internal, Research Article, Chemical Elements
Abstract

Reductions in cerebral oxygen saturation (ScO2) measured by near infra-red spectroscopy have been found during compensated hypovolemia in the lower body negative pressure (LBNP)-model, which may reflect reduced cerebral blood flow. However, ScO2 may also be contaminated from extracranial (scalp) tissues, mainly supplied by the external carotid artery (ECA), and it is possible that a ScO2 reduction during hypovolemia is caused by reduced scalp, and not cerebral, blood flow. The aim of the present study was to explore the associations between blood flow in precerebral arteries and ScO2 during LBNP-induced hypovolemia. Twenty healthy volunteers were exposed to LBNP 20, 40, 60 and 80 mmHg. Blood flow in the internal carotid artery (ICA), ECA and vertebral artery (VA) was measured by Doppler ultrasound. Stroke volume for calculating cardiac output was measured by suprasternal Doppler. Associations of changes within subjects were examined using linear mixed-effects regression models. LBNP reduced cardiac output, ScO2 and ICA and ECA blood flow. Changes in flow in both ICA and ECA were associated with changes in ScO2 and cardiac output. Flow in the VA did not change during LBNP and changes in VA flow were not associated with changes in ScO2 or cardiac output. During experimental compensated hypovolemia in healthy, conscious subjects, a reduced ScO2 may thus reflect a reduction in both cerebral and extracranial blood flow.

Published
2019

97. The Annual Training Periodization of 8 World Champions in Orienteering.

Author

Tønnessen, Espen, Svendsen, Ida S., Rønnestad, Bent R., Hisdal, Jonny, Haugen, Thomas A., and Seiler, Stephen

Subjects
ACADEMIC medical centers, CYCLES, LACTATES, PHYSICAL fitness, PHYSICAL training & conditioning, ELITE athletes, DATA analysis software, DESCRIPTIVE statistics
Abstract

One year of training data from 8 elite orienteers were divided into a transition phase (TP), general preparatory phase (GPP), specific preparatory phase (SPP), and competition phase (CP). Average weekly training volume and frequency, hours at different intensities (zones 1–3), cross-training, running, orienteering, interval training, continuous training, and competition were calculated. Training volume was higher in GPP than TP, SPP, and CP (14.9 vs 9.7, 11.5, and 10.6 h/wk, P < .05). Training frequency was higher in GPP than TP (10 vs 7.5 sessions/wk, P < .05). Zone 1 training was higher in GPP than TP, SPP, and CP (11.3 vs 7.1, 8.3, and 7.7 h/wk, P < .05). Zone 3 training was higher in SPP and CP than in TP and GPP (0.9 and 1.1 vs 1.6 and 1.5 h/ wk, P < .05). Cross-training was higher in GPP than SPP and CP (4.3 vs 0.8 h/wk, P < .05). Interval training was higher in GPP than TP, SPP, and CP (0.7 vs 0.3 h/wk, P < .05). High-intensity continuous training was higher in GPP than CP (0.9 vs 0.4 h/ wk, P < .05), while competition was higher in SPP and CP than in TP and GPP (1.3 and 1.5 vs 0.6 and 0.3 h/wk, P < .01). In conclusion, these champion endurance athletes achieved a progressive reduction in total training volume from GPP to CP via a shortening of each individual session while the number of training sessions remained unchanged. This decrease in training volume was primarily due to a reduction in the number of hours of low-intensity, non-sport-specific cross-training. [ABSTRACT FROM AUTHOR]

Published
2015
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