Publications using the OxyMon
Increased frontal brain activation during walking while dual tasking: An fNIRS study in healthy young adults
Background: Accumulating evidence suggests that gait is influenced by higher order cognitive and cortical control mechanisms. Recently, several studies used functional near infrared spectroscopy (fNIRS) to examine brain activity during walking, …
Mental workload during n-back task-quantified in the prefrontal cortex using fNIRS
When interacting with technical systems, users experience mental workload. Particularly in multitasking scenarios (e.g., interacting with the car navigation system while driving) it is desired to not distract the users from their primary task. For …
Peripheral fatigue is not critically regulated during maximal, intermittent, dynamic leg extensions
Central motor drive to active muscles is believed to be reduced during numerous exercise tasks to prevent excessive peripheral fatigue development. The purpose of the present study was to use hypoxia to exacerbate physiological perturbations during a …
Preserved foot motor cortex in patients with complete spinal cord injury: A functional near-infrared spectroscopic study
Background. Since the brain is intact, persons with a spinal cord injury (SCI) might benefit from a brain-computer interface (BCI) to improve mobility by making use of functional near-infrared spectroscopy (fNIRS). Objective. We aimed to use fNIRS to …
Similar scaling of contralateral and ipsilateral cortical responses during graded unimanual force generation
Hemibody movements are strongly considered as being under the control of the contralateral hemisphere of the cerebral cortex. However, some neuroimaging studies have found a bilateral activation of either the primary sensori-motor (SM1) areas or the …
Slowed muscle oxygen uptake kinetics with raised metabolism are not dependent on blood flow or recruitment dynamics
Oxygen uptake kinetics ($τ$V̇O2) are slowed when exercise is initiated from a raised metabolic rate. Whether this reflects the recruitment of muscle fibres differing in oxidative capacity, or slowed blood flow (Q̇) kinetics is unclear. This study …
The evolution of near infrared spectroscopy in urology
In the 50 year history of NIRS, biomedical applications in urology are recent. This review summarizes technical advances and novel enquiry that have led to hemodynamic monitoring of the testis, measures of renal function, evaluation of the pelvic …
Ventilatory chemosensitivity, cerebral and muscle oxygenation, and total hemoglobin mass before and after a 72-day Mt. everest expedition
Ventilatory chemosensitivity, cerebral and muscle oxygenation, and total hemoglobin mass before and after a 72-day Mt. Everest expedition. High Alt Med Biol 15:331-340, 2014. - Background: We investigated the effects of chronic hypobaric hypoxic …
Very-low-frequency oscillations of cerebral hemodynamics and blood pressure are affected by aging and cognitive load
Spontaneous slow oscillations occur in cerebral hemodynamics and blood pressure (BP), and may reflect neurogenic, metabolic or myogenic control of the cerebral vasculature. Aging is accompanied by a degeneration of the vascular system, which may have …
Muscle oxygen consumption by NIRS and mobility in multiple sclerosis patients
Background: The study of muscle metabolism by near-infrared spectroscopy (NIRS) has been poorly implemented in multiple sclerosis (MS). Aims of the study were to compare resting muscle oxygen consumption (rmVO2) at gastrocnemius in MS patients and in …
Hand tapping at mixed frequencies requires more motor cortex activity compared to single frequencies: An fNIRS study
Fast cyclic movements and discrete motor acts are controlled differently, presumably because fast cyclic tasks are more automated, thereby depending on different circuits. If fast cyclic movements are made less predictable (e.g., by mixing …
Interaction of Central and Peripheral Factors during Repeated Sprints at Different Levels of Arterial O2 Saturation
Purpose:To investigate the interaction between the development of peripheral locomotor muscle fatigue, muscle recruitment and performance during repeated-sprint exercise (RSE).Method:In a single-blind, randomised and cross-over design, ten male …
Linear parameter-varying model and adaptive filtering technique for detecting neuronal activities: An fNIRS study
Objective. Functional near-infrared spectroscopy (fNIRS) is an emerging non-invasive brain imaging technique that measures brain activities by using near-infrared light of 650-950 nm wavelength. The major advantages of fNIRS are its low cost, …
AltitudeOmics: On the consequences of high-altitude acclimatization for the development of fatigue during locomotor exercise in humans
Amann M, Goodall S, Twomey R, Subudhi AW, Lovering AT, Roach RC. AltitudeOmics: on the consequences of high-altitude acclimatization for the development of fatigue during locomotor exercise in humans. J Appl Physiol 115: 634-642, 2013. First …
Effect of aerobic interval training on erythrocyte rheological and hemodynamic functions in heart failure patients with anemia
Background: Anemia disturbs hemorheological/hemodynamic properties, whereas aerobic interval training (AIT) achieves a superior aerobic fitness in patients with heart failure (HF). This study investigated whether AIT influences functional capacity by …
Near-infrared assessments of skeletal muscle oxidative capacity in persons with spinal cord injury
After spinal cord injury (SCI) skeletal muscle decreases in size, increases in intramuscular fat, and has potential declines in mitochondrial function. Reduced mitochondrial function has been linked to the development of metabolic disease. The aim of …
Effect of end-tidal CO 2 clamping on cerebrovascular function, oxygenation, and performance during 15-km time trial cycling in severe normobaric hypoxia: the role of cerebral O 2 delivery
During heavy exercise, hyperventilation-induced hypocapnia leads to cerebral vasoconstriction, resulting in a reduction in cerebral blood flow (CBF). A reduction in CBF would impair cerebral O2 delivery and potentially account for reduced exercise …
Cerebral oxygenation during hyperoxia-induced increase in exercise tolerance for untrained men
This study aimed to investigate the involvement of cerebral oxygenation in limitation of maximal exercise. We hypothesized that O2 supplementation improves physical performance in relation to its effect on cerebral oxygenation during exercise. Eight …
Discomfort and the cortical haemodynamic response to coloured gratings
In five experiments we measured the amplitude of the haemodynamic response to visual patterns using near infrared spectroscopy of the visual cortex. The patterns were gratings with bars that differed in chromaticity but not in luminance. In all …
Exertional periodic breathing potentiates erythrocyte rheological dysfunction by elevating pro-inflammatory status in patients with anemic heart failure
Background: Exertional periodic breathing (EPB) or anemia is associated with an adverse prognosis in advanced heart failure (HF). The disturbed rheological properties of erythrocytes may contribute to circulatory disorders. This study investigated …