Physiological Responses to Upper Limb NMES
3 de junio de 2026 actualizado por: Kieron.Day
Exploring Local Physiological Changes in the Arm During NMES Using the Firefly® Device
The primary objective of this study is to explore the application of the Firefly® device for delivering NMES to anatomically defined regions of the upper limb and to observe associated physiological changes.
Specifically, the study will assess alterations in arterial and venous blood flow, as well as local muscle oxygen saturation, as potential indicators of muscle perfusion during NMES.
Descripción general del estudio
Estado
Terminado
Condiciones
Intervención / Tratamiento
Descripción detallada
Participants will undergo NMES using the Firefly® device, applied to two predefined regions of the upper limb: one targeting the anterior arm nerve bundle (a collective term referring to motor and sensory nerves within the anterior and medial compartments of the upper arm, including the musculocutaneous and adjacent (median, medial cutaneous, ulnar and radial) nerves, and the other targeting the median nerve in the proximal forearm.
Vascular responses will be assessed at two sites, the brachial artery and axillary vein, using Doppler ultrasound. For each nerve-vascular site pairing, NMES will alternate between stimulation OFF and ON conditions (10 OFF and 10 ON cycles), comprising one stimulation block of approximately 20 minutes. Each participant will complete four stimulation blocks in total.
During both ON and OFF phases, blood flow volume and haemodynamic parameters, including peak systolic velocity (PSV), end-diastolic velocity (EDV), and resistive index (RI), will be recorded. Additionally, local muscle oxygen saturation (SmO₂) will be continuously monitored using functional near-infrared spectroscopy (fNIRS) to assess tissue-level physiological changes.
The total study participation time per individual is approximately 2 hours.
Tipo de estudio
Intervencionista
Inscripción (Actual)
10
Fase
- No aplica
Contactos y Ubicaciones
Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.
Ubicaciones de estudio
-
-
Buckinghamshire
-
High Wycombe, Buckinghamshire, Reino Unido, HP11 1JX
- Firstkind
-
-
Criterios de participación
Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.
Criterio de elegibilidad
Edades elegibles para estudiar
- Adulto
Acepta Voluntarios Saludables
No
Descripción
Inclusion Criteria:
- Aged 18 to 45 years (inclusive)
- No known history of vascular or neurological conditions affecting the upper extremities
- Able to read, understand, and communicate in English to ensure informed consent and safe participation in the study
Exclusion Criteria:
- Presence of any condition that contraindicates the use of neuromuscular electrical stimulation (e.g., implanted pacemaker, epilepsy)
- Current or recent injury to the upper limbs that may interfere with stimulation or measurement
- Anatomical variations in the brachial artery or axillary vein, specifically vascular branching outside expected anatomical locations, as identified by ultrasound, which may impair accurate blood flow measurement or device placement
- Currently participating in another interventional or physiological research study or having done so within the past 30 days.
- Currently pregnant
Plan de estudios
Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Ciencia básica
- Asignación: N / A
- Modelo Intervencionista: Asignación de un solo grupo
- Enmascaramiento: Ninguno (etiqueta abierta)
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
|---|---|
|
Experimental: Single experimental arm: Firefly NMES
|
Firefly NMES device applied to the upper limb during a single-visit exploratory pysiological study
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
|
Change in upper-limb blood flow volume during NMES (ON vs OFF)
Periodo de tiempo: During single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles
|
Within-subject change in upper-limb blood flow volume (mL/min) measured using Doppler ultrasound during neuromuscular electrical stimulation (NMES) delivered via the Firefly device, comparing stimulation ON versus OFF conditions.
Measurements will be collected across repeated stimulation cycles at predefined upper-limb stimulation zones and vascular assessment sites.
|
During single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles
|
|
Change in upper-limb peak systolic velocity during NMES (ON vs OFF)
Periodo de tiempo: During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
Within-subject change in upper-limb peak systolic velocity (PSV; cm/s) measured using Doppler ultrasound during NMES delivered via the Firefly device, comparing stimulation ON versus OFF conditions across repeated stimulation cycles at predefined upper-limb stimulation zones and vascular assessment sites.
|
During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
|
Change in upper-limb end-diastolic velocity during NMES (ON vs OFF)
Periodo de tiempo: During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
Within-subject change in upper-limb end-diastolic velocity (EDV; cm/s) measured using Doppler ultrasound during NMES delivered via the Firefly device, comparing stimulation ON versus OFF conditions across repeated stimulation cycles at predefined upper-limb stimulation zones and vascular assessment sites.
|
During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
|
Change in upper-limb resistive index during NMES (ON vs OFF)
Periodo de tiempo: During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
Within-subject change in upper-limb resistive index (RI; unitless ratio) derived from Doppler ultrasound measurements during NMES delivered via the Firefly device, comparing stimulation ON versus OFF conditions across repeated stimulation cycles at predefined upper-limb stimulation zones and vascular assessment sites.
|
During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
|
Change in upper-limb muscle oxygen saturation during NMES (ON vs OFF)
Periodo de tiempo: During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
Within-subject change in upper-limb muscle oxygen saturation (SmO₂; %) measured continuously using functional near-infrared spectroscopy (fNIRS) during NMES delivered via the Firefly device, comparing stimulation ON versus OFF conditions across repeated stimulation cycles at predefined upper-limb stimulation zones and assessment sites.
|
During a single study visit (approximately 2 hours), across repeated stimulation ON/OFF cycles.
|
Medidas de resultado secundarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
|
Incidence of adverse events and device-related effects
Periodo de tiempo: During single study visit (approximately 2 hours)
|
Number and type of adverse events (AEs), serious adverse events (SAEs), adverse device effects (ADEs), serious adverse device effects (SADEs), and device deficiencies observed during study participation.
|
During single study visit (approximately 2 hours)
|
Colaboradores e Investigadores
Aquí es donde encontrará personas y organizaciones involucradas en este estudio.
Patrocinador
Fechas de registro del estudio
Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.
Fechas importantes del estudio
Inicio del estudio (Actual)
19 de septiembre de 2025
Finalización primaria (Actual)
3 de octubre de 2025
Finalización del estudio (Actual)
3 de octubre de 2025
Fechas de registro del estudio
Enviado por primera vez
10 de abril de 2026
Primero enviado que cumplió con los criterios de control de calidad
3 de junio de 2026
Publicado por primera vez (Actual)
9 de junio de 2026
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
9 de junio de 2026
Última actualización enviada que cumplió con los criterios de control de calidad
3 de junio de 2026
Última verificación
1 de junio de 2026
Más información
Términos relacionados con este estudio
Palabras clave
Otros números de identificación del estudio
- FFR-ARM-002 (Otro número de subvención/financiamiento: Firstkind)
Plan de datos de participantes individuales (IPD)
¿Planea compartir datos de participantes individuales (IPD)?
SÍ
Descripción del plan IPD
Available upon request
Tipo de información de apoyo para compartir IPD
- PROTOCOLO DE ESTUDIO
- CIF
Información sobre medicamentos y dispositivos, documentos del estudio
Estudia un producto farmacéutico regulado por la FDA de EE. UU.
No
Estudia un producto de dispositivo regulado por la FDA de EE. UU.
No
producto fabricado y exportado desde los EE. UU.
No
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .