Video Experimental Relacionado

Updated: Jan 10, 2026

Nephrotic Syndrome I : Introduction

Nephrotic Syndrome I : Introduction

Published on: June 19, 2025

Control de la actividad nerviosa simpática de la piel durante el ejercicio de apretón de manos estático intermitente

Urs A Leuenberger¹, Sogol Mostoufi-Moab, Michael Herr

¹Department of Medicine, Division of Cardiology, Pennsylvania State College of Medicine, Milton S. Hershey Medical Center, Hershey, PA 17033, USA. uleuenberger@psu.edu

|November 5, 2003

Resumen

El ejercicio aumenta la actividad del nervio simpático cutáneo (SSNA). La entrada afectiva de los músculos en ejercicio, además de los factores neuronales centrales, modula esta respuesta, particularmente durante la isquemia.

Área de la Ciencia:

Fisiología del ejercicio Fisiología del ejercicio
Regulación del sistema nervioso autónomo.
Circulación cutánea La circulación cutánea.

Sus antecedentes:

La activación del sistema nervioso simpático (SNS) varía según el tipo de ejercicio, la intensidad y el sistema de órganos.
El comando central y los aferentes musculares impulsan principalmente el flujo de salida del SNS al músculo esquelético.
Los mecanismos que controlan el flujo de salida del SNS a la piel durante el ejercicio no se comprenden completamente.

Objetivo del estudio:

Para investigar los mecanismos neuronales que controlan la actividad del nervio simpático cutáneo (SSNA) durante el ejercicio.
Para determinar el papel de la entrada aferente muscular en la modulación de la SSNA durante el ejercicio de agarre estático.

Principales métodos:

El SSNA medido durante el agarre estático intermitente de la mano (SHG) en el 45% de la contracción voluntaria máxima.
SSNA evaluado durante la congestión venosa del antebrazo e isquemia inducida por un paro circulatorio.
Las respuestas evaluadas de SSNA a la compresión simulada de la empuñadura de la mano y el manguito neumático.

Principales resultados:

SHG aumentó constantemente el SSNA en 1-2 segundos.
La isquemia, a diferencia de la congestión venosa, elevó significativamente el SSNA en comparación con el control.
La SSNA se mantuvo alta durante el paro circulatorio posterior al apretón de la mano, lo que indica una influencia aferente sostenida.

Conclusiones:

La entrada afectiva de los músculos que ejercitan es crucial para modular el flujo de salida simpático a la piel.
Los factores neuronales centrales y las señales aferentes musculares interactúan para regular la actividad nerviosa simpática de la piel durante el ejercicio.

Palabras clave:

No programático No programático

Más Videos Relacionados

Glomerular Filtration

Glomerular Filtration

Renal Corpuscle

Renal Corpuscle

Videos de Conceptos Relacionados

Nephrotic Syndrome I : Introduction

Nephrotic Syndrome I : Introduction

Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of...

Glomerular Filtration

Glomerular Filtration

The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
Components of the Filtration Membrane
The filtration process involves three key layers: the glomerular endothelial cells, the basement membrane, and the podocyte-formed filtration slits.

Renal Corpuscle

Renal Corpuscle

The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous...

Confocal Fluorescence Microscopy

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

Nephrons

Nephrons

The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma...

Glomerular Filtration Rate and its Regulation

Glomerular Filtration Rate and its Regulation

The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...