Cruz Torres, Blanca de laMartínez Jiménez, EvaNavarro Flores, EmmanuelPalomo López, PatriciaAbuín Porras, VanesaAbuín Porras, VanesaDíaz Meco, RaquelLópez López, DanielRomero Morales, CarlosRomero Morales, Carlos2025-12-072025-12-072021De-la-Cruz-Torres, B., Martínez-Jiménez, E., Navarro-Flores, E., Palomo-López, P., Abuín-Porras, V., Díaz-Meco-Conde, R., López-López, D., & Romero-Morales, C. (2021). Heart rate variability monitoring during interferential current application in the lower back area: A cross-sectional study. International Journal of Environmental Research and Public Health, 18(7), 3394. https://doi.org/10.3390/ijerph180733941660-4601https://hdl.handle.net/11268/16578Vasovagal reactions may occur occasionally during electrical stimulation using interferential current (IFC). The purpose of this study was to examine variations in autonomic activity during the application of IFC in asymptomatic participants by analysis of their heart rate variability (HRV). Seventy-three male volunteers were randomly assigned to a placebo group (n = 36; HRV was documented for 10 min, both at rest and during a placebo intervention) and an intervention group (n = 37; HRV was documented for 10 min in two conditions labelled as (1) rest and (2) application of IFC technique on the lumbar segment). The diameters of the Poincaré plot (SD1, SD2), stress score (SS), and the ratio between sympathetic and parasympathetic activity (S/PS) were measured. After interventions, differences amongst the placebo group and the IFC group were found in SD2 (p < 0.001), SS (p = 0.01) and S/PS ratio (p = 0.003). The IFC technique was associated with increased parasympathetic modulation, which could induce a vasovagal reaction. Monitorization of adverse reactions should be implemented during the application of IFC technique. HRV indicators might have a part in prevention of vasovagal reactions. Further studies in patients with lumbar pain are needed to explore possible differences in HRV responses due to the presence of chronic pain.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Cardiologíajournal article10.3390/ijerph18073394open accessSistema cardiovascularaparaGoal 3: Ensure healthy lives and promote well-being for all at all ages