Video Experimental Relacionado
Updated: Jul 18, 2026
08:05
Testing Tactile Masking between the Forearms
Published on: February 10, 2016
Tráfico nervioso simpático del músculo y la piel durante el efecto "abrigo blanco"
1Cattedra di Medicina Interna, Università di Milano, Ospedale S. Gerardo, Monza, and Centro di Fisiologia Clinica e Ipertensione, IRCCS, Milano, Italy.
Circulation
|July 21, 1999
Resumen
El efecto de "capa blanca" durante la medición de la presión arterial aumenta la presión arterial y la frecuencia cardíaca. Esta respuesta implica una disminución de la actividad del nervio simpático muscular y un aumento de la actividad del nervio simpático cutáneo.
Área de la Ciencia:
- Fisiología cardiovascular fisiología cardiovascular.
- Investigación del sistema nervioso autónomo.
Sus antecedentes:
- La medición esfigmomanométrica de la presión arterial puede desencadenar una reacción de alerta, elevando la presión arterial y la frecuencia cardíaca.
- El impacto de este efecto de "capa blanca" en el tráfico del nervio simpático sigue siendo inexplorado.
Objetivo del estudio:
- Para investigar los cambios en el tráfico del nervio simpático durante el efecto "capa blanca".
- Para determinar las respuestas específicas de los nervios simpáticos musculares y de la piel al estrés inducido por la medición de la presión arterial.
Principales métodos:
- La microneurografía se utilizó para medir la actividad del nervio simpático muscular y cutáneo en 10 pacientes hipertensos leves.
- La presión arterial y la frecuencia cardíaca fueron monitoreadas utilizando Finapres y ECG, respectivamente.
- Las mediciones se tomaron durante un período de control, una visita al médico para la medición de la presión arterial y un período de recuperación.
Principales resultados:
- La visita al médico causó un aumento significativo en el tráfico del nervio simpático de la piel (+38.6%).
- Por el contrario, el tráfico del nervio simpático muscular disminuyó significativamente (-25,5%).
- Estos cambios persistieron durante la visita y se resolvieron gradualmente después.
Conclusiones:
- La reacción de alerta a la medición de la presión arterial provoca respuestas simpáticas distintas: simpatoexcitación en la piel y simpatoinhibición en los músculos.
- Este comportamiento diferencial del sistema nervioso adrenérgico caracteriza el fenómeno del "abrigo blanco".
Videos de Conceptos Relacionados
01:16Sensory Functions of the Skin
The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
01:19The Effect of Aging on Tissues
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
01:14Changes in Skin Color: Clinical Perspectives
The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
01:21Skeletal Muscle Relaxants: Adverse Effects
Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
Unlike...
Unlike...
01:22Muscle Stimulation Frequency
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
01:16Sympathetic Activation
The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...