Impedance cardiography applied to maximal arm cranking exercise: a matter of sampling and processing strategy

Theisen, Daniel; Francaux, Marc; Welle, Jacques Michotte De; Sturbois, Xavier

doi:10.1097/00005768-199808000-00022

Cited by 4 publications

References 23 publications

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Blood distribution adaptations in paraplegics during posture changes: peripheral and central reflex responses

Theisen

Vanlandewijck

Sturbois

et al. 2000

European Journal of Applied Physiology

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The veno-arteriolar reflex (VAR) in spinal-cord-injured subjects (SCI) has been attributed little interest, although it might contribute substantially to their blood redistribution. This peripheral reflex response, which is based on an axon reflex, consists of a reduction in limb blood flow following an increase in venal transmural pressure. The purpose of the present investigation was to assess the peripheral and central cardiovascular adaptations of paraplegics with high (HP) and low (LP) spinal lesions to subsequent, passive posture changes involving leg dependency and upright sitting, and to compare them to able-bodied (AB) subjects. Lower-limb cutaneous vascular conductance (CVC) was evaluated from skin blood flow measurements (laser Doppler flowmetry) taken from the dorsal foot, and from ankle blood pressure. Cardiac stroke volume, heart rate and myocardial performance were assessed using impedance cardiography and brachial blood pressure. During leg dependency, a significant vasoconstriction was noted in all three groups. The initial decrease in CVC was higher in HP (-76.82%) than in AB (-45.82%), the values for LP (-67.08%) lying in between these two (significant group x time interaction: F = 2.832; P = 0.042). There were no differences for parameters of central hemodynamics. No between-group differences were noted in any parameter tested during upright sitting. CVC remained at a similar low level as compared to leg dependency, stroke volume decreased, heart rate and blood pressure increased, and myocardial performance remained constant. The present results suggest that paraplegics have a peripheral VAR in their paralyzed lower limbs, and that this contributes to their cardiovascular stability.

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Blood distribution adaptations in paraplegics during posture changes: peripheral and central reflex responses

Theisen

Vanlandewijck

Sturbois

et al. 2000

European Journal of Applied Physiology

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Modified scaled Fourier linear combiner in thoracic impedance cardiography

Ishiguro¹,

Umezu²,

Yasuda³

et al. 2006

Computers in Biology and Medicine

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Central and Peripheral Haemodynamics in Individuals With Paraplegia During Light and Heavy Exercise

Theisen

Vanlandewijck²,

Sturbois³

et al. 2001

Journal of Rehabilitation Medicine

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The purpose of this study was to analyse lower leg skin blood flow (laser Doppler flowmetry) in five individuals with high-level paraplegia (T5-T9), six participants with low-level paraplegia (T10-T12) and six able-bodied controls during 3-minute light and heavy arm-cranking exercises (approximately 15% and 80% peak power output, respectively). Throughout light exercise, cutaneous vasoconstriction was shown for the control group (-20%), but not the low-level (+62%) or the high-level paraplegic group (+33%). During heavy exercise, vasoconstriction was initially found for controls followed by an increase in skin blood flow during the last 2 minutes, whereas the participants with paraplegia demonstrated skin blood flow increases. Skin blood flow responses were not related to lesion level. Metabolic parameters were not different among the three groups, but heart rates for participants with paraplegia were higher during heavy exercise than in controls. These results suggest impaired sympathetic vasoconstriction in individuals with paraplegia during exercise.

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Impedance cardiography applied to maximal arm cranking exercise: a matter of sampling and processing strategy

Abstract: The present procedure opens a new field of application to impedance cardiography, permitting to measure cardiac output during maximal arm cranking exercise.

Cited by 4 publications

References 23 publications

Blood distribution adaptations in paraplegics during posture changes: peripheral and central reflex responses

Blood distribution adaptations in paraplegics during posture changes: peripheral and central reflex responses

Modified scaled Fourier linear combiner in thoracic impedance cardiography

Central and Peripheral Haemodynamics in Individuals With Paraplegia During Light and Heavy Exercise

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