PortaMon
The gold-standard research device for the measurement of muscle oxygenation
Publications using the PortaMon
The energy cost of cyclic muscle contractions at different initial muscle-tendon unit lengths derived from near-infrared spectroscopy
During locomotion, the plantarflexor muscle fascicles appear to operate on the ascending limb of its maximal force-length relationship, producing less force per unit activation and elevating the energy cost (EC) compared to contractions performed at …
The use of far-infrared-re-emitting patches during and after a short trail run does not influence the energy cost and the maximal force decrement, but does reduce perceived fatigue
Purpose The objective of this randomized, single-blind, crossover study was to determine whether patches re-emitting far-infrared radiation (FIR) affect the energy cost of running (ECR) and the maximal isometric force during and after a short trail …
Twelve-week nitrate-rich beetroot extract supplementation improves lower limb vascular function and serum angiogenic potential in postmenopausal women
Postmenopausal women exhibit impaired lower limb vascular function and reduced angiogenic capacity, increasing cardiovascular risk. This study demonstrates that 12 wk of nitrate-rich beetroot extract supplementation enhances femoral artery …
Assessing the feasibility of near-infrared spectroscopy for evaluating physiological exercise thresholds
To examine the feasibility of using near-infrared spectroscopy (NIRS) for physiological threshold detection and whether NIRS-derived parameters differ between highly-trained and less-trained cyclists. Twenty-seven male cyclists were divided into: …
Cardiorespiratory and oxygenation responses in iron-deficient anemic women during whole-body exercise under moderate hypoxia
Purpose Integrated physiological responses during maximal whole-body exercise, such as cycling, under additive hypoxemia (anemia + hypoxia) are not adequately studied. Therefore, we investigated cardiovascular, muscular and cerebral oxygenation …
Change in mitochondrial capacity in elite triathletes, cyclists, and wrestlers over a training period of 28 days
Purpose This study investigated the change in mitochondrial capacity and VO2max in elite triathlon, cycling, and Greco-Roman wrestling athletes over a 28-day training period. Methods Sixteen elite athletes (23 ± 2.5 years; 176 ± 6 cm; 76 ± 8 kg; 65 ± …
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 …