The relationship of foot and ankle movements to venous return in the lower limb

The acquisition of the patients’ active force is the key process to realize the active rehabilitation function of lower limb rehabilitation robot. This paper analyzes the relationship of human-machine coupling force and patients’ active force, based on what put forward a proposal to acquire the active force .A sensor is designed to detect the human-machine coupling force and a stress analysis is carried on based on the actual usage of the sensor. The scheme of the stress foil arrangement and bridge circuit design are discussed in the paper. And a FEA is also carried out to analyze the strain situation of the elastomer.

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Instantaneous venous return curves in an intact canine preparation

Journal of Applied Physiology ◽

10.1152/jappl.1984.56.3.765 ◽

1984 ◽

Vol 56 (3) ◽

pp. 765-771 ◽

Cited By ~ 88

Author(s):

M. R. Pinsky

Keyword(s):

Venous Return ◽

Right Atrial ◽

Negative Slope ◽

Positive Pressure ◽

Similar Degree ◽

Straight Line ◽

Mean Systemic Pressure ◽

Relationship Of ◽

The Relationship ◽

Stop Flow

The relationship between right atrial pressure (Pra) and venous return describes a venous return curve. Because changes in venous return and right ventricular stroke volume (SVRV) are similar during small tidal volume (VT) breathing, we compared the relationship of SVRV and Pra during positive-pressure ventilation (VT less than 10 ml/kg) in 17 pentobarbital-anesthetized, closed-chest, canine preparations. The SVRV-Pra relationship describes a straight line with a negative slope and a positive mean systemic pressure (Pms)-zero flow intercept (instantaneous Pms). Instantaneous Pms is similar to ventricular fibrillation-induced (stop-flow) Pms (8.1 +/- 0.8 vs. 8.4 +/- 0.7 mmHg, mean +/- SE). With volume infusion, both instantaneous and stop-flow Pms increase to a similar degree (R = 0.9014, P less than 0.001). The effect of opening an arteriovenous fistula is time dependent and variable between dogs, but by 30 s it is associated with an increase in instantaneous Pms (5.2 +/- 3.2 mmHg). Vascular compliance determined by adding and removing blood from the intravascular space displays a curvilinear hysteresis. The instantaneous venous return curve is affected by intravascular blood volume, vasomotor tone, and resistance to venous return. The relationship between SVRV and Pra during small VT breathing define instantaneous venous return curves similar to those described using right-heart bypass preparations.

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The relationship of gross upper and lower limb motor competence to measures of health and fitness in adolescents aged 13–14 years

BMJ Open Sport & Exercise Medicine ◽

10.1136/bmjsem-2017-000288 ◽

2018 ◽

Vol 4 (1) ◽

pp. e000288 ◽

Cited By ~ 2

Author(s):

Benjamin David Weedon ◽

Francesca Liu ◽

Wala Mahmoud ◽

Renske Metz ◽

Kyle Beunder ◽

...

Keyword(s):

Upper Limb ◽

Aerobic Capacity ◽

Lower Limb ◽

Anaerobic Power ◽

School Students ◽

Motor Competence ◽

Health And Fitness ◽

Fitness Measures ◽

Relationship Of ◽

The Relationship

IntroductionMotor competence (MC) is an important factor in the development of health and fitness in adolescence.AimsThis cross-sectional study aims to explore the distribution of MC across school students aged 13–14 years old and the extent of the relationship of MC to measures of health and fitness across genders.MethodsA total of 718 participants were tested from three different schools in the UK, 311 girls and 407 boys (aged 13–14 years), pairwise deletion for correlation variables reduced this to 555 (245 girls, 310 boys). Assessments consisted of body mass index, aerobic capacity, anaerobic power, and upper limb and lower limb MC. The distribution of MC and the strength of the relationships between MC and health/fitness measures were explored.ResultsGirls performed lower for MC and health/fitness measures compared with boys. Both measures of MC showed a normal distribution and a significant linear relationship of MC to all health and fitness measures for boys, girls and combined genders. A stronger relationship was reported for upper limb MC and aerobic capacity when compared with lower limb MC and aerobic capacity in boys (t=−2.21, degrees of freedom=307, P=0.03, 95% CI −0.253 to –0.011).ConclusionNormally distributed measures of upper and lower limb MC are linearly related to health and fitness measures in adolescents in a UK sample.Trial registration numberNCT02517333.

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The relationship of trunk kinematics and kinetics with lower limb pathology during gait in children with spastic cerebral palsy

Gait & Posture ◽

10.1016/j.gaitpost.2021.02.032 ◽

2021 ◽

Author(s):

Damien Kiernan

Keyword(s):

Cerebral Palsy ◽

Lower Limb ◽

Spastic Cerebral Palsy ◽

Trunk Kinematics ◽

Relationship Of ◽

The Relationship ◽

Kinematics And Kinetics

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Dose–response effects of cardiac glycosides on pooling and systemic and pulmonary hemodynamics

Canadian Journal of Physiology and Pharmacology ◽

10.1139/y70-081 ◽

1970 ◽

Vol 48 (8) ◽

pp. 533-541 ◽

Cited By ~ 3

Author(s):

Linda T. Archer ◽

Lerner B. Hinshaw

Keyword(s):

Cardiac Glycosides ◽

Venous Return ◽

Intact Animal ◽

Peripheral Resistance ◽

Major Site ◽

Pulmonary Hemodynamics ◽

Relationship Of ◽

The Relationship ◽

Major Emphasis ◽

Vascular Region

The effects of ouabain and digoxin on systemic and cardiopulmonary circulations and the degree and site of vascular pooling were evaluated in this study. A major emphasis was placed on the relationship of dosage to responses observed. Experiments were performed on 32 adult mongrel dogs using a venous return (constant cardiac inflow) preparation. Animals were divided into two groups, intact and eviscerated. Mean cumulative doses were 27, 55, and 81 μg/kg for intact ouabain-injected dogs; 21, 42, 63, 84, and 105 μg/kg for intact digoxin-injected dogs; and 26, 52, and 77 μg/kg for eviscerated ouabain-injected dogs. There was a positive correlation between amount of blood pooled and dose of cardiac glycosides given in the intact animal. The statistical difference in pooling at each dose of ouabain between intact and eviscerated animals implicated the hepatosplanchnic vascular bed as a major site of pooling. Since there was a significant statistical increase in total peripheral resistance in intact ouabain-injected dogs but not in ouabain-treated eviscerated animals, the site of peripheral resistance changes appears to be the hepatosplanchnic vascular region. Left atrial pressures rose significantly in intact and eviscerated dogs at higher ouabain doses. These findings underscore the complexity of the mechanisms of action of cardiac glycosides and emphasize the critical importance of dosage, type of glycoside administered, and individual variation of response in the canine species.

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