Publications using the PortaLite
Cerebral oxygenation response to postural change using continuous near-infrared spectroscopy (NIRS) and its association with falls in older adults
Background Impaired cerebral perfusion during postural changes may contribute to fall risk in older adults. This study used near-infrared spectroscopy (NIRS) as a proxy for cerebral blood flow to investigate the association between cerebral …
Dietary nitrate supplementation reduces performance decline during repeated sprint exercise independent of sex
Dietary nitrate supplementation has been shown to improve endurance exercise performance, but its effects on repeated anaerobic sprints and potential sex-based differences remain underexplored. This study examined whether acute dietary nitrate …
Judicious elevation of ambient carbon dioxide during hypobaric hypoxia to improve oxygenation in airline passengers - a randomized feasibility study
Despite pressurization of airliner cabins, some passengers experience in-flight hypobaric hypoxia with blood oxygen saturation dropping below 90%, potentially causing discomfort and increasing the risk of medical events. Enrichment of the cabin air …
Sex comparisons across different indices of vascular health in recreationally active healthy adults
Introduction The presence of sex differences in various vascular assessments in younger to middle-aged adults is inconsistent in the literature. Purpose Determine whether sex differences are present across four different indices of vascular health. …
Sex differences in NIRS-derived reactive hyperemia across protocols and their association with muscle quality
Introduction Sex-related differences in microvascular reactivity may be influenced by the magnitude of muscle desaturation (ischemic stimulus) during the blood flow occlusion period. Thus, this study used near-infrared spectroscopy (NIRS) to assess …
Skeletal muscle microvascular and respiratory responses to exercise in healthy and T2D adults: agreement and reproducibility study of NIRS technologies
Introduction Continuous wave (CW) near-infrared spectroscopy (NIRS) is widely used in skeletal muscle tissue hemodynamic and respiratory research utilizing fixed light scattering assumptions. Purpose Compare reproducibility and technical …
Effects of an adapted swimming program with visual prompts on executive functions in children with Autism Spectrum Disorder (ASD) and Intellectual Disability (ID)
Executive functions (EF) are higher-order cognitive processes that support goal-directed behavior, learning, and adaptation. Children with autism spectrum disorder (ASD) and intellectual disability (ID) often show EF deficits that affect attention, …
Sex differences in cardiovascular disease risk in type 1 diabetes: The vascular bed paradox in women
Background Cardiovascular disease (CVD) is the leading cause of death in individuals with type 1 diabetes (T1D). Epidemiological studies indicate that women with T1D are at greater risk of CVD compared to men with T1D. The present study sought to …
Blood flow restriction induces similar peripheral stress but greater central drive impairments than systemic hypoxia during repeated cycling sprints
Purpose Systemic hypoxia (SH) and blood flow restriction (BFR) are methods used to improve repeated sprint exercise ability. This study aimed to compare their respective impacts on neuromuscular fatigue etiology of the lower limbs during cycling …
Effect of repeated hot water immersion on cognitive performance, cerebrovascular function, sleep and biomarkers of neurodegeneration in older adults
Ageing is associated with cognitive decline and increased risk of developing neurodegenerative disease. Repeated passive heating, using hot water immersion (HWI), may improve cognitive performance via improved cerebral oxygenation, but this is yet to …
Impaired peripheral oxygen delivery during submaximal exercise in adults with long textlessspan style="font-variant:small-caps;"textgreaterCOVIDtextless/spantextgreater
Long COVID (LC) is a multisystem condition that is linked to distinct pathologies including viral persistence, immunological dysfunction, endothelial damage, and mitochondrial dysfunction. To date, limited research has assessed peripheral tissue …
Orthostatic hypotension without co-existent supine hypertension is associated with impaired cerebral oxygenation: findings from the Irish Longitudinal Study on Ageing (TILDA)
Hypertension and orthostatic hypotension (OH) are common in older age, with both conditions recognized as risk factors for cardiovascular disease and end organ damage. Cerebral hypoperfusion is postulated to play a role in these adverse effects. For …
Physiological responses of individuals with idiopathic chilblains during cold exposure and rewarming: a nonrandomized clinical trial
Idiopathic chilblains (IC) is a localized inflammatory disorder affecting acral areas, with unclear pathophysiology and pathogenesis. This study aimed to investigate the vasomotor, autonomic, and inflammatory responses of adults with (HIC þ ) and …
Sex Differences in Torque and Oxygenation Responses During Maximal Repeated Dynamic Unilateral Leg Extension Muscle Actions
Sex differences in performance fatigability (PF) are task- and intensity-dependent, as variations in neuromuscular and vascular function modulate the ability to sustain torque output. However, few studies have examined differences in the onset of …
Menstrual cycle influences skeletal muscle oxygenation during high-intensity interval training: a work to rest evaluation
Introduction: The menstrual cycle (MC), characterized by hormonal fluctuations, may impact skeletal muscle oxygenation (SMO) during high-intensity interval training (HIIT). SMO measured around HIIT in eumenorrheic (EUM) or hormonal contraceptive (HC) …
Bioceramic arm garment does not increase diameter of brachial artery and blood flow—Compliance and biceps microcirculation in male recreational sports practitioners at rest: A single blinded randomized cross over study
Background Interest in clothing that reflects far infrared (FIR) radiation naturally emitted by the body during and after exercise has increased based on the assumption that this can increase arterial and venous blood flow. Indeed, in vitro and …
Cerebral oxygenation and cognitive performance under different acute normobaric hypoxic conditions: a fNIRS study
This study investigates the effects of different levels of acute normobaric hypoxia on cognitive function and cerebral oxygenation in healthy young adults.
Effect of Dietary Nitrate Intake on Fatigue Resistance Following Ischemia-Induced Microvascular Dysfunction in Males and Females
Background Skeletal muscle fatigue reflects the interaction of metabolic demand, contractile efficiency, and oxygen delivery, processes highly dependent on microvascular function. Prolonged ischemia induces transient microvascular dysfunction that …
Impact of the menstrual cycle phase on microvascular function at high altitude
Ovarian hormones may modulate key physiological functions that play a crucial role in the acute response to hypoxia. Women remain underrepresented in high-altitude physiology research. This exploratory study aimed to investigate the impact of …
Ischemic Preconditioning Does Not Improve Climbing Specific Performance in Elite Athletes
Platzer, H-P, Köck, A, Schobersberger, W, and Dünnwald, T. Ischemic preconditioning does not improve climbing specific performance in elite athletes. J Strength Cond Res 40(1): e69–e75, 2026—The aim of the present investigation was to analyze the …