PortaMon
The gold-standard research device for the measurement of muscle oxygenation
Publications using the PortaMon
Commuting by bicycle (vs. by car) is associated with improved aerobic power, microvascular function and diminished CO$_textrm2$ output in the atmosphere
The study investigated whether bicycle compared with car commuting, over relatively small distances, has positive effects on physiological variables, cardiometabolic fitness and CO2 output in the atmosphere. Bike Commuters (11 M, 15 F; age [median …
Comparison of peripheral tissue perfusion and calf pump function in women with mild/moderate and severe chronic venous disease symptom intensity
Objective To compare calf muscle function and peripheral tissue perfusion in women with chronic venous disease (CVD) with mild/moderate and severe symptoms. Methods A cross-sectional study included women with CVD classified in stages C1, C2, and C3. …
Exploring the limits of exercise capacity in adults with type II diabetes
Objective This study investigates the mechanisms behind exercise capacity in adults with type 2 diabetes mellitus (T2DM), focusing on central and peripheral components, as described by the Fick equation. Methods A cross-sectional study of 141 adults …
Isokinetic Total Work and Mitochondrial Oxidative Capacity Are Correlated in Appraising Hamstrings Endurance Performance of Young, Healthy, and Highly Active Adults
Purpose: To assess the association between skeletal-muscle endurance performance and mitochondrial oxidative capacity of the hamstrings as respectively measured by biomechanical and physiological standards. Methods: Nineteen (12 men and 7 women) …
Sex differences in near-infrared spectroscopy reactive hyperemia: Influence of adipose tissue and desaturation rate
Abstract Sex differences in near-infrared spectroscopy (NIRS) reactive hyperemia outcomes have been previously reported, with females generally having a lower reperfusion slope. Sex differences have also been reported for adipose tissue thickness …
Effects of 4-week continuous hypoxic training on skeletal muscle oxygenation using near-infrared spectroscopy and functional magnetic resonance imaging
Purpose This study aimed to investigate the effects of 4-week continuous hypoxic training (CHT) on skeletal muscle oxygenation and hemodynamics, assessed using functional near-infrared spectroscopy (NIRS) and blood oxygenation level-dependent …
The impact of topical capsaicin application on the muscle metaboreflex and microvascular responsiveness
Topical capsaicin reduces metaboreflex responses during post-exercise circulatory arrest (PECA) in males, but its effects in females and on microvascular responsiveness in either sex remain unclear. This study hypothesized that capsaicin would reduce …
Cohort profile: characterisation, determinants, mechanisms and consequences of the long-term effects of COVID-19 – providing the evidence base for health care services (CONVALESCENCE) in the UK
Purpose The pathogenesis of the long-lasting symptoms which can follow an infection with the SARS-CoV-2 virus (‘long covid’) is not fully understood. The ‘COroNaVirus post-Acute Long-term EffectS: Constructing an evidENCE base’ (CONVALESCENCE) study …
Effectiveness of short-term cycling interventions in older adults: a randomized trial of hypoxic, blood flow restriction, and eccentric cycling
We evaluated whether a short-term cycling intervention in hypoxia, with blood flow restriction, or eccentric cycling induces greater health benefits than traditional cycling in older adults. Fifty-five individuals (68 ± 4 year, 25 females) performed …
Erythrocyte Glycolytic and Redox Metabolism Affects Muscle Oxygenation and Exercise Performance: A Randomized Double-Blind Crossover Study in Men
Background Erythrocytes are traditionally considered passive oxygen carriers, yet their energetic and redox metabolism plays a critical role in regulating oxygen kinetics. Objective This study integrates experimental and computational data to provide …
Examination of post-exercise microvascular reactivity in healthy adults
Aim Skeletal muscle blood volume responds to the metabolic demands of exercise and augmented microvasculature reactivity. We sought to explore the effects of exercise intensity (maximal vs. submaximal) on near-infrared spectroscopy (NIRS)-derived …
Influence of local and remote ischemic preconditioning on 3-min all-out exercise performance: A randomized controlled crossover study
Objective This study investigated the influences of local ischemic preconditioning (LIPC) and remote ischemic preconditioning (RIPC) on muscle deoxygenation before and during a 3-min all-out cycling test (3 MT), as well as on 3 MT performance. …
Maximizing muscle deoxygenation during interval training in middle-distance runners
The present study aimed to investigate which of two commonly performed running interval sessions elicited the greatest magnitude of and time spent with elevated muscle deoxygenation in trained middle-distance runners. Thirteen trained middle-distance …
Oral contraceptives do not impact metabolic and cardiorespiratory response during acute high-intensity rowing interval exercise — a pilot study
Purpose: Increasing prevalence of oral contraceptive (OC) use in physically active females highlights the need for sex-specific exercise metabolism research. This pilot study investigated the influence of chronic OC use on the exercising metabolic …
Persistence of fatigue in the absence of pathophysiological mechanisms in some patients more than 2 years after the original SARS‐CoV‐2 infection
Following an acute infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a substantial percentage of patients report the persistence of debilitating symptoms, often grouped in a syndrome termed ‘long COVID’. We sought to …
Bilateral NIRS measurements of muscle mitochondrial capacity: Feasibility and repeatability
Background Non-invasive determination of mitochondrial capacity via near infrared spectroscopy (NIRS) typically involves voluntary exercise of a single muscle group followed by as many as 26 brief ischemic cuff occlusions to determine a single …
Critical power and critical oxygenation: examining transferability between normoxia and hypoxia
We sought to investigate if critical oxygenation (COx) is a robust marker of exercise intensity, and if it remains stable in normoxia and hypoxia with simultaneous changes in critical power (CP) and heart rate (HR).Thirty-three highly trained …
Effects of Proteinuria on Cerebral and Muscle Oxygenation and Microvascular Reactivity in Patients With Pre-Dialysis Chronic Kidney Disease: A Post-Hoc Analysis
Introduction Vascular dysfunction is a hallmark of chronic kidney disease (CKD), with previous studies showing progressively deteriorating microvascular reactivity in skeletal muscles with advancing CKD stages. Additionally, cognitive impairment is …
Impaired cerebral hemodynamics and oxygenation in type 2 diabetes: insights into insulin resistance and hyperglycemia effects
Aims Emerging evidence suggests Type 2 diabetes (T2D) may adversely affect cerebral hemodynamics and oxygenation. This study aimed to explore the impact of uncomplicated T2D on cerebral hemodynamics and oxygenation during maximal exercise. Methods In …
Paraspinal muscle deoxygenation and neuromuscular involvement of agonist and antagonist muscles during prolonged trunk extension exercise
Objective: To investigate the agonist and antagonist muscles implication during a prolonged trunk extension exercise and to determine the relationship with paraspinal muscle metabolic and hemodynamic responses in healthy individuals. Methods: Sixteen …