Publications using the PortaLite
Changes in prefrontal hemodynamics and mood states during screen use: a functional near-infrared spectroscopy study
Screen use has been associated with poor cognitive and mental health, yet few studies have examined its effects on brain activity. Our aims were to describe changes in brain activity and mood states following brief exposure to screen-based content; …
Diving behaviour and physiology of the Korean Haenyeo
There is a long history of breath-hold diving cultures in East Asia, with references in Japanese chronicles as early as the third century BC. Given evidence of genetic adaptations for phenotypes associated with enhanced diving capacity within such …
Using Functional Near-Infrared Spectroscopy to Elucidate Neurophysiological Mechanism of Action of Equine-Assisted Services: Proof-of-Concept Study
Equine-assisted services (EAS) are used for civilian and military trauma survivors to reduce depression and posttraumatic stress symptoms. While early scientific evidence supports the benefits of EAS, the neurophysiological mechanisms underlying …
Effect of repeating simulated high-stress scenario assessments on paramedicine student performance and psychophysiological response
In medical education, consistent and repetitive practice are crucial for mastering highly technical skills and clinical diagnosis. Hands-on experience and simulations play a vital role in developing these competencies. Objective structured clinical …
Examination of neuromuscular and tissue oxygenation characteristics during submaximal treadmill running with blood flow restriction
Purpose The use of blood flow restricted (BFR) running may provide an alternative to lower the running speed without compromising physiological responses that often occur during high intensity running. The purpose of this investigation was to compare …
Sleep indicators and staging: A functional near-infrared spectroscopy study in healthy young adults
Functional near-infrared spectroscopy(fNIRS)-based sleep staging has attracted considerable interest due to its portability and limited interference with sleep. However, few studies have systematically examined sleep indicators or formulated sleep …
Impact of acute and chronic cycling exercise on microvascular reactivity of the upper and lower extremity muscles in young healthy females
Background Few studies have evaluated the impact of exercise on specific skeletal muscle microvascular function, despite its importance. This study aimed to assess the acute and chronic effects of cycling exercise on microvascular reactivity in the …
A new incremental cycling cognitive-motor dual-task test to assess simultaneous sustained attention and neuromuscular fatigue in trained athletes.
INTRODUCTION. Cognitive efficiency during cognitive-motor dual-task (CMDT) varies with exercise intensity, with low-to-moderate intensities supposed to enhance performance according to an inverted-U theory. This effect remains unexplored in trained …
Impact of menopause on responses to hypoxia and incidence of acute mountain sickness
Purpose Menopause results in decreased ovarian hormones, potentially impacting physiological responses to hypoxia and its tolerance. This study explored menopause’s influence on physiological responses during rest and exercise in normobaric hypoxia …
Evaluating the Intensity of Muscle Contraction by Near‐Infrared Spectroscopy, a Potential Application for Scaling Muscle Spasm
Muscle spasticity, common in conditions such as cerebral palsy, spinal cord injury, and multiple sclerosis, is traditionally assessed using the Modified Ashworth Scale, which lacks consistency. This study evaluates near‐infrared spectroscopy (NIRS) …
Muscle deoxygenation responses are similar between repeated sprints in hypoxia performed with uni‐ versus bi‐lateral knee extensions but reduced compared to cycling
The aim of this study was to assess the effects of oxygen availability (normoxia vs. hypoxia), muscle mass and exercise type on pulse oxygen saturation, and quadriceps muscle oxygenation during repeated sprint exercises. Sixteen healthy participants …
Preoperative physical resilience indicators and their associations with postoperative outcomes
The health benefit of surgery in older adults may be outweighed by negative effects on cognitive or physical function. Physical resilience is defined as the potential for recovery after a stressor such as surgery. We assessed associations between …
Methodology to establish non-invasive synchronous heart rate and heart rate variability measurement during uroflowmetry
Heart rate (HR) and heart rate variability (HRV) are established measures related to cardiovascular disease (CVD), a known risk factor correlated with lower urinary tract symptoms (LUTS) and overactive bladder (OAB). However, no standardized …
A Muscle Physiology-Based Framework for Quantifying Training Load in Resistance Exercises
Background: Objective training load (TL) indexes used in resistance training lack physiological significance. This study was aimed to provide a muscle physiology-based approach for quantifying TL in resistance exercises (REs). Methods: Following …
Acute effects of isolated and combined dietary nitrate and caffeine ingestion on ergometer-based 1000 m time trial performance in highly trained kayakers
Dietary nitrate (BR) and caffeine (CAF) ingestion have been shown to increase sports performance. However, the isolated and combined effects of BR and CAF ingestion on time trial (TT) performance as well as the accompanying physiological and …
Central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia
Aim To investigate central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia. Methods The effects on vastus lateralis muscle strength in a cross-over study …
Relationship between overall right pre-frontal cortex activity and learning and retention of a visuomotor adaptation task: a continuous analysis
Learning a visuomotor adaptation task (VMA) is typically assessed by describing the behavioral changes during adaption (early-fast and late-slow phases) and retention (consolidation) tests. Few studies have concurrently examined behavioral and brain …
Sex-Based Effects on Muscle Oxygenation During Repeated Maximal Intermittent Handgrip Exercise
Background: This investigation aimed to examine sex-based differences in deoxy[heme] (HHb), tissue saturation (StO2), and force-deoxygenation ratio (FD) of the forearm flexor muscles during a maximal-effort intermittent fatiguing handgrip protocol. …
Tissue oxygenation in response to low-load and high-load back squats with continuous blood flow restriction in athletes
To determine muscle oxygenation with continuous blood flow restriction (BFR) training in high load (HL), 80% one-repetition maximum (1RM) and low load (LL), 30% 1RM squat exercises. In week-2 of a 4-week resistance training programme as part of their …
Ketone monoester ingestion improves cardiac function in adults with type 2 diabetes: a double-blind, placebo controlled, randomised, crossover trial
Type 2 diabetes (T2D) is a metabolic disease associated with cardiovascular dysfunction. The myocardium preferentially uses ketones over free fatty acids as a more energy efficient substrate. The primary aim was to assess the effects of ketone …