Acute Fatigue Impairs Heart Rate Variability and Resting Muscle Oxygen Consumption Kinetics
Source abstract
Abstract
This study evaluated the influence of acute fatigue on heart rate variability (HRV) and muscle oxygen saturation (SmO2) at rest, as well as the reliability of SmO2 data measured using near-infrared spectroscopy (NIRS) during a vascular occlusion test (VOT). Twelve physically active subjects participated. Measurements included perceived muscle soreness using the visual analog scale (VAS pain), HRV parameters, variables of resting SmO2 (desaturation and resaturation), and reoxygenation kinetics (mean response time, MRT) through a VOT-NIRS located in the vastus lateralis (VL). Measurements were taken at three points: 24 h before, before exhaustive exercise, and 30 min after exhaustive exercise. The results indicated that acute fatigue increased resting muscle oxygen consumption in desaturation (+22 SmO2) and resaturation (+18 SmO2), improved MRT (−15 s), and elevated sympathetic nervous system (SNS) activity, as observed in the R-R interval (−262 ms) and SNS index (+0.5). HRV significantly influenced desaturation (r2 = 0.69), resaturation (r2 = 0.60), and MRT (r2 = 0.54). Reliability was established with an ICC of 0.49 and 0.63 for desaturation and resaturation, respectively. Real changes in desaturation and resaturation should be considered ≥ 7% SmO2 at rest and ≥ 11% SmO2 to avoid daily fatigue interference. In conclusion, acute fatigue increases resting SmO2 consumption and is associated with higher SNS activity and increased VAS pain.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Heart Rate Variability and Autonomic Control · Cardiovascular and exercise physiology · Non-Invasive Vital Sign Monitoring
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Facultad de Ciencias del Deporte, Universidad de Extremadura, Cáceres 10003, Spain
Faculty Education and Social Sciences, Universidad Andres Bello, Viña del Mar 2520000, Chile
Exercise and Rehabilitation Sciences Laboratory, School of Physical Therapy, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Viña del Mar 2520000, Chile
Laboratory of Sport Sciences, Centro de Medicina Deportiva Sports MD, Viña del Mar 2521156, Chile
Carrera de Entrenador Deportivo, Escuela de Educación, Universidad Viña del Mar, Viña del Mar 2520000, Chile
Laboratorio de Evaluación y Prescripción de Ejercicio, Facultad de Ciencias de la Actividad Física y del Deporte, Universidad de Playa Ancha, Valparaíso 2340000, Chile
Exercise and Rehabilitation Sciences Institute, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Santiago 7550000, Chile
Geroscience Center for Brain Health and Metabolism (GERO), Santiago 8320000, Chile
Grupo AFySE, Investigación en Actividad Física y Salud Escolar, Escuela de Pedagogía en Educación Física, Facultad de Educación, Universidad de las Américas, Santiago 8320000, Chile
iGEO Group, School of Physical Education, Pontificia Universidad Católica de Valparaíso, Valparaíso 2340000, Chile
IGOID Research Group, Faculty of Sport Science, University of Castilla-La Mancha, 45071 Toledo, Spain
Facultad de Medicina, Escuela de Medicina, Universidad Andres Bello, Santiago 750000, Chile
Department of Education, Health Research Centre, University of Almería, 04120 Almeria, Spain
Funding
Ministry of Universities of the Spanish Government
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