Publications using the OxyMon
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 …
Whole-body vibration influences lower extremity circulatory and neurological function
Whole-body vibration (WBV) is currently used to enhance performance and treat injuries even though we lack an understanding of how WBV influences physiological processes. An improved understanding of the physiological effects of WBV could lead to …
Classification of mental tasks in the prefrontal cortex using fNIRS
Functional near infrared spectroscopy (fNIRS) is rapidly gaining interest in both the Neuroscience, as well as the Brain-Computer-Interface (BCI) community. Despite these efforts, most single-trial analysis of fNIRS data is focused on motor-imagery, …
Comparison of causality analysis on simultaneously measured fMRI and NIRS signals during motor tasks
Brain activity can be measured using different modalities. Since most of the modalities tend to complement each other, it seems promising to measure them simultaneously. In to be presented research, the data recorded from Functional Magnetic …
Changes in cerebral oxygenation during parabolic flight
Assessing changes in brain activity under extreme conditions like weightlessness is a desirable, but difficult undertaking. Results from previous studies report specific changes in brain activity connected to an increase or decrease in gravity …
Middle cerebral O2 delivery during the modified Oxford maneuver increases with sodium nitroprusside and decreases during phenylephrine
The modified Oxford maneuver is the reference standard for assessing arterial baroreflex function. The maneuver comprises a systemic bolus injection of 100 $μ$g sodium nitroprusside (SNP) followed by 150 $μ$g phenylephrine (PE). On the one hand, this …
The relationship between brain cortical activity and brain oxygenation in the prefrontal cortex during hypergravity exposure
Artificial gravity has been proposed as a method to counteract the physiological deconditioning of long-duration spaceflight; however, the effects of hypergravity on the central nervous system has had little study. The study aims investigate whether …
Impaired cerebral haemodynamic function associated with chronic traumatic brain injury in professional boxers
The present study examined to what extent professional boxing compromises cerebral haemodynamic function and its association with CTBI (chronic traumatic brain injury). A total of 12 male professional boxers were compared with 12 age-, gender- and …