Publications using the OxyMon
Discomfort from urban scenes: Metabolic consequences
Scenes from nature share in common certain statistical properties. Images with these properties can be processed efficiently by the human brain. Patterns with unnatural statistical properties are uncomfortable to look at, and are processed …
Effect of ageing on hypoxic exercise cardiorespiratory, muscle and cerebral oxygenation responses in healthy humans
New Findings: What is the central question of this study? This study aimed to determine the effect of ageing on cardiorespiratory and tissue oxygenation responses to hypoxia during maximal incremental exercise. What is the main finding and its …
The differential effects of prolonged exercise upon executive function and cerebral oxygenation
The acute-exercise effects upon cognitive functions are varied and dependent upon exercise duration and intensity, and the type of cognitive tasks assessed. The hypofrontality hypothesis assumes that prolonged exercise, at physiologically challenging …
Effects of ON and OFF subthalamic nucleus-DBS on prefrontal cortex activation during a cognitive task: An fNIRS study
Methods: Out of 8 PD STN-DBS patients, we present here preliminary analysis of a male (62y) PD patient with bilateral STN-DBS (unipolar, 180Hz, 3.5V). The patient was tested after 12h withdrawal of dopamine medications in both an “OFF” and “ON” DBS …
Cerebral oxygenation and sympathetic responses to smoking in young and middle-aged smokers
This study examined the effects of acute tobacco smoking on cerebral oxygenation and autonomic function in 28 male, habitual smokers of shorter young smokers (YSM) or longer middle-aged smokers (MSM) smoking history. Following baseline testing, …
Functional connectivity analysis using fNIRS in healthy subjects during prolonged simulated driving
Noninvasive and accurate assessment of driving fatigue in relation to brain activity during long-term driving can contribute to traffic safety and accident prevention. This study evaluated functional connectivity (FC) in relevant brain regions. …
Prefrontal activation may predict working-memory training gain in normal aging and mild cognitive impairment
Cognitive training has been shown to result in improved behavioral performance in normal aging and mild cognitive impairment (MCI), yet little is known about the neural correlates of cognitive plasticity, or about individual differences in …
Effects of respiratory muscle work on respiratory and locomotor blood flow during exercise
New Findings: What is the central question of this study? Does manipulation of the work of breathing during high-intensity exercise alter respiratory and locomotor muscle blood flow? What is the main finding and its importance? We found that when the …
Extending the limits of force endurance: Stimulation of the motor or the frontal cortex?
Previous findings indicate that facilitation of primary motor cortex (PMC) activity using trans-cranial direct current stimulation (tDCS) could improve resistance to physical fatigue. However, studies have failed to consistently replicate these …
Oxygen Delivery and Utilization During Acute Dynamic Exercise
Background and aims Polycystic ovary syndrome (PCOS) and type 1 diabetes are relatively common endocrinopathies, often manifesting across most of the lifespan. Cardiovascular risk is increased in both PCOS and type 1 diabetes, affecting patients' …
Saving mental effort to maintain physical effort: a shift of activity within the prefrontal cortex in anticipation of prolonged exercise
Executive functioning and attention require mental effort. In line with the resource conservation principle, we hypothesized that mental effort would be saved when individuals expected to exercise for a long period. Twenty-two study participants …
The effect of mental fatigue on sustained attention: an fNIRS study
Sustained attention is the ability to keep focused and vigilance for long time in external stimulation, which was crucial in safe-critical human-machine system. While the ability of sustained attention will decline because of mental fatigue, even …
THE IMMEDIATE AND EXTENDED EFFECT OF DIET AND EXERCISE ON METABOLIC FLEXIBILTY A Dissertation Louisiana State University and Agricultural and Mechanical College in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The Schoo
Metabolic inflexibility is an emerging physiological marker indicative of metabolic dysfunction and associated with type 2 diabetes (T2D) and obesity. Exercise is a potent stimulus to improve metabolic health, however, not much is known about the …
The investigation of brain-computer interface for motor imagery and execution using functional near-infrared spectroscopy
Functional near-infrared spectroscopy (fNIRS), which can measure cortex hemoglobin activity, has been widely adopted in brain-computer interface (BCI). To explore the feasibility of recognizing motor imagery (MI) and motor execution (ME) in the same …
Impact of flavonoid-rich black tea and beetroot juice on postprandial peripheral vascular resistance and glucose homeostasis in obese, insulin-resistant men: A randomized controlled trial
Background: Insulin-stimulated muscle blood flow facilitates plasma glucose disposal after a meal, a mechanism that is impaired in obese, insulin-resistant volunteers. Nitrate- or flavonoid-rich products, through their proposed effects on nitric …
Multivitamins and minerals modulate whole-body energy metabolism and cerebral blood-flow during cognitive task performance: A double-blind, randomised, placebo-controlled trial
Background: The brain is by far the most metabolically active organ in the body, with overall energy expenditure and local blood-supply closely related to neural activity. Both energy metabolism and cerebral vaso-dilation are dependent on adequate …
NIRS-EEG joint imaging during transcranial direct current stimulation: Online parameter estimation with an autoregressive model
Background Transcranial direct current stimulation (tDCS) has been shown to perturb both cortical neural activity and hemodynamics during (online) and after the stimulation, however mechanisms of these tDCS-induced online and after-effects are not …
Transcranial direct current stimulation improves isometric time to exhaustion of the knee extensors
Transcranial direct current stimulation (tDCS) can increase cortical excitability of a targeted brain area, which may affect endurance exercise performance. However, optimal electrode placement for tDCS remains unclear. We tested the effect of two …
T2-prepared velocity selective labelling: A novel idea for full-brain mapping of oxygen saturation
Background and aim: Disturbances in cerebral oxygenation saturation (SO2) have been linked to adverse outcome in adults, children, and neonates. In intensive care, the cerebral SO2 is increasingly being monitored by Near-InfraRed Spectroscopy (NIRS). …
Physiological characteristics of elite high-altitude climbers
Factors underlying the amplitude of exercise performance reduction at altitude and the development of high-altitude illnesses are not completely understood. To better describe these mechanisms, we assessed cardiorespiratory and tissue oxygenation …