Publications using the PortaLite
The validity and reliability of continuous-wave near-infrared spectroscopy for the assessment of leg blood volume during an orthostatic challenge
Near-infrared spectroscopy (NIRS) can potentially be used to assess the cardiovascular autonomic system by monitoring orthostatic challenge-induced shifts in lower limb blood volume. However, in order to be of clinical utility the test must be valid, …
Investigating the impact of passive external lower limb compression on central and peripheral hemodynamics during exercise
Purpose: The objective of this study was to assess the effectiveness of graduated compression socks (GCS) on enhancing muscle blood flow and oxygenation during exercise and recovery in healthy subjects. Methods: Twelve healthy volunteers completed a …
Effect of acute hypoxia on inspiratory muscle oxygenation during incremental inspiratory loading in healthy adults
Purpose: To non-invasively examine the effect of acute hypoxia and inspiratory threshold loading (ITL) on inspiratory muscles [sternocleidomastoid (SCM), scalene (SA) and parasternal (PS)] oxygenation in healthy adults using near-infrared …
Effects of continuous and intermittent exercise on executive function in children aged 8-10 years
Understanding the effects of acute exercise on executive function in prepubescent children may be important for the enhancement of school performance. This study assessed the effect of an acute bout of continuous (CONT) or intermittent (INT), …
Frequency domain analysis of cerebral near infrared spectroscopy signals during application of an impedance threshold device in spontaneously ventilating volunteers
Currently available near infrared spectroscopy (NIRS) devices are unable to discriminate between arterial and venous blood, a potential source of artifact. The purpose of this study was to test the hypothesis that oscillations in NIR signals at the …
MAP, cerebral Oxygenation and tes-mep variabilty's in scolios surgery
Objective: At this moment, a wake-up test needs to be done when amplitudes of TES-MEP monitoring decrease irreversible during scoliosis surgery, what mostly turns out to be a false-positive. To make TES-MEP measurements more reliable, we need to know …
The effect of active versus passive recovery periods during high intensity intermittent exercise on local tissue oxygenation in 18-30 year old sedentary men
Purpose: High intensity interval training (HIIT) has been proposed as a time-efficient format of exercise to reduce the chronic disease burden associated with sedentary behaviour. Changes in oxygen utilisation at the local tissue level during an …
The effect of short and long term endurance training on systemic, and muscle and prefrontal cortex tissue oxygen utilisation in 40-60 year old women
Purpose: Aerobic endurance training (ET) increases systemic and peripheral oxygen utilisation over time, the adaptation pattern not being linear. However, the timing and mechanisms of changes in oxygen utilisation, associated with training beyond one …
The Role of the Frontal Lobe in Complex Walking among Patients with Parkinson's Disease and Healthy Older Adults: An fNIRS Study
Background. Gait is influenced by higher order cognitive and cortical control mechanisms. Functional near infrared spectroscopy (fNIRS) has been used to examine frontal activation during walking in healthy older adults, reporting increased oxygenated …
Exploring the capability of wireless near infrared spectroscopy as a portable seizure detection device for epilepsy patients
Purpose Near infrared spectroscopy (NIRS) has proved useful in measuring significant hemodynamic changes in the brain during epileptic seizures. The advance of NIRS-technology into wireless and portable devices raises the possibility of using the …
The brain mechanisms underlying walking in complex situations in healthy older adults and persons with parkinson's disease
Introduction: The ability to walk safely and independently is a fundamental component of daily living activities. Walking while dual tasking and obstacle negotiation are two tasks that have been used to investigate walking in complex situations. …
A hybrid EEG-fNIRS BCI: Motor imagery for EEG and mental arithmetic for fNIRS
In this paper, we have combined electroencephalography (EEG) and functional near-infrared spectroscopy (fNRIS) to make a hybrid EEG-NIRS based system for brain-computer interface (BCI). The EEG electrodes were placed on the motor cortex region and …
Biomedical applications of wireless continuous wave near infrared spectroscopy
Progress in research applications of near infrared spectroscopy (NIRS) and growing clinical interest have led to significant improvements in hardware and software. Amongst continuous wave systems the use of light emitting diodes, incorporation of …