Publications using the PortaLite
Effect of dark chocolate supplementation on tissue oxygenation, metabolism, and performance in trained cyclists at altitude
Dark chocolate (DC) is high in flavonoids and has been shown to increase nitric oxide in the blood. Increased nitric oxide has the potential to improve delivery of oxygen to muscle, especially in hypoxic conditions, such as altitude. Our aim was to …
A comparison of VȮ2, and muscle and prefrontal cortex tissue oxygen extraction between short and long-term aerobically trained men aged 40-60 years
International Journal of Exercise Science 13(3): 964-978, 2020. This study was designed to compare systemic O2 utilization (VȮ2), and changes in tissue O2 extraction [deoxyhemoglobin ($Δ$HHb)] in the vastus lateralis (VL), gastrocnemius (GAST) and …
A Cross-species Model of Dual-Task Walking in Young and Older Humans and Rats
Introduction: Dual-task walking is common in daily life but becomes more difficult with aging. Little is known about the neurobiological mechanisms affecting competing cognitive demands. Translational studies with human and animal models are needed …
Age and sex differences in frontal lobe cerebral oxygenation in older adults—Normative values using novel, scalable technology: Findings from the Irish Longitudinal Study on Ageing (TILDA)
Aims: Near-infrared spectroscopy (NIRS) is a non-invasive, easy to apply, optical technology for measuring cerebral blood oxygenation, but there is lack of comprehensive population data to aid interpretation and clinical use. Given the importance of …
Altered arterial stiffness, cerebral blood flow and cognitive function in young smokers in response to one-bout of aerobic exercise: Mice vs. hiie
PURPOSE: This study aimed to compare the acute effects of high-intensity interval exercise (HIIE) with moderate-intensity continuous exercise (MICE) on arterial stiffness, cerebral blood flow and cognitive function in young smokers. METHODS: Young …
Associations between Neurocardiovascular Signal Entropy and Physical Frailty
In this cross-sectional study, the relationship between noninvasively measured neurocardiovascular signal entropy and physical frailty was explored in a sample of community-dwelling older adults from The Irish Longitudinal Study on Ageing (TILDA). …
Cardiorespiratory fitness, blood pressure, and cerebral oxygenation during a dual-task in healthy young males
This study aimed to evaluate the effects of cardiorespiratory fitness (CRF) and mean arterial pressure (MAP) on the prefrontal cortex (PFC) oxygenation and dual-task performance in healthy young males. Changes in the concentration of oxygenated …
Comparison of near infrared spectroscopy (NIRS) and near-infrared transillumination-backscattering sounding (NIR-T/BSS) methods
The aim of the study was to compare simultaneously recorded a NIR-T/BSS and NIRS signals from healthy volunteers. NIR-T/BSS is a device which give an ability to non-invasively detect and monitor changes in the subarachnoid space width (SAS). …
Determining whether tennis benefits the updating function in young children: A functional near-infrared spectroscopy study
This study aimed at investigating the behavioral and neuro-electrical impacts of a coordinative exercise intervention on the updating function of the working memory (WM) in young children. Children in the experimental group was tested on the 1-back …
Dopaminergic therapy and prefrontal activation during walking in individuals with Parkinson's disease: does the levodopa overdose hypothesis extend to gait?
The “levodopa-overdose hypothesis” posits that dopaminergic replacement therapy (1) increases performance on tasks that depend on the nigrostriatal-pathway (e.g., motor-control circuits), yet (2) decreases performance on tasks that depend upon the …
Dynamic cerebral autoregulation estimates derived from near infrared spectroscopy and transcranial Doppler are similar after correction for transit time and blood flow and blood volume oscillations
We analysed mean arterial blood pressure, cerebral blood flow velocity, oxygenated haemoglobin and deoxygenated haemoglobin signals to estimate dynamic cerebral autoregulation. We compared macrovascular (mean arterial blood pressure-cerebral blood …
Effect of novel short-arm human centrifugation-induced gravitational gradients upon cardiovascular responses, cerebral perfusion and g-tolerance
Key points: The aim of this study was to determine the effect of rotational axis position (RAP and thus g-gradient) during short-arm human centrifugation (SAHC) upon cardiovascular responses, cerebral perfusion and g-tolerance. In 10 male and 10 …
Exposure to acute normobaric hypoxia results in adaptions of both the macro- and microcirculatory system
Although acute hypoxia is of utmost pathophysiologic relevance in health and disease, studies on its effects on both the macro- and microcirculation are scarce. Herein, we provide a comprehensive analysis of the effects of acute normobaric hypoxia on …
Influence of sprint exercise on aortic pulse wave velocity and femoral artery shear patterns
Purpose: Aortic stiffness may affect shear patterns in the peripheral vasculature. This study examined if sprint exercise, which typically increases aortic stiffness is associated with increased peripheral retrograde blood flow and impaired …
Quantitative Evaluation of Age-Related Effects Based on Oxygenation Dynamic Signals During the Wisconsin Card Sorting Test
The present study investigated age-related changes in the time-varying hemodynamics of the prefrontal cortex by using near-infrared spectroscopy (NIRS). NIRS is a real-time spectroscopic method used to measure functional hemodynamic responses related …
Thesis The Voice of Primates : Neuro-evolutionary Aspects of Emotions NEURO-EVOLUTIONARY ASPECTS OF EMOTIONS
Rightly emphasized by Pascal Belin “Voices are everywhere”. From music to social conversation, the human voice has indeed the extraordinary power to communicate our everyday emotions. Shaped by millions of years of evolution, the vocal recognition of …
Cognitive performance is associated with cerebral oxygenation and peripheral oxygen saturation, but not plasma catecholamines, during graded normobaric hypoxia
New Findings: What is the central question of this study? What are the mechanisms responsible for the decline in cognitive performance following exposure to acute normobaric hypoxia? What are the main findings and their importance? We found that (1) …
Superficial femoral artery blood flow with intermittent pneumatic compression of the lower leg applied during walking exercise and recovery
The purpose of this study was to determine if muscle blood flow during walking exercise and postexercise recovery can be augmented through the application of intermittent compression of the lower legs applied during the diastolic phase of the cardiac …
An overview of the feasibility of permanent, real-time, unobtrusive stress measurement with current wearables
Negative consequences of stress are a pervasive problem in our modern society. Recent developments in wearable lifestyle hardware have led to unobtrusive, sensor-packed, always-on devices that might finally be able to continuously monitor biosignals …
A comparison of mental and visual load resulting from semi-automated and conventional forest forwarding: An experimental machine simulation study
The purpose of the present study was to extend the knowledge of functional linkages between visual and mental load, performance, and prefrontal cortex (PFC) activity, during forestry forwarding work. Eleven healthy participants, range 21–51 years …