PortaMon
The gold-standard research device for the measurement of muscle oxygenation
Publications using the PortaMon
Positive Association between NIRS‐derived measures of Microvascular Reactivity and Mitochondrial Capacity in the Quadriceps and Hamstrings
BACKGROUND Delivery of oxygen to the mitochondria is essential for oxidative phosphorylation and the production of ATP during rest and during muscle contraction. Despite widespread application of near infrared spectroscopy (NIRS), to our knowledge it …
Higher strength gain after hypoxic vs normoxic resistance training despite no changes in muscle thickness and fractional protein synthetic rate
Acute hypoxia has previously been suggested to potentiate resistance training-induced hypertrophy by activating satellite cell-dependent myogenesis rather than an improvement in protein balance in human. Here, we tested this hypothesis after a 4-week …
Physiological and Biomechanical Determinants of Sprint Ability Following Variable Intensity Exercise When Roller Ski Skating
The most common race format in cross-country (XC) skiing is the mass-start event, which is under-explored in the scientific literature. To explore factors important for XC skiing mass-starts, the main purpose of this study was to investigate …
Benefits of Concurrent Aerobic-Resistance Interval Exercise in Patients with Chronic Obstructive Pulmonary Disease
Background: Physical training of lower leg skeletal muscle has been shown to increase exercise tolerance in Chronic Obstructive Pulmonary Disease (COPD) patients. The objective of this study was to measure the effect of concurrent aerobic-resistance …
Comparing muscle VO $_textrm2$ from near-infrared spectroscopy desaturation rate to pulmonary VO $_textrm2$ during cycling below, at and above the maximal lactate steady state
Muscle oxygen uptake (V̇O 2m ) evaluated from changes in the near-infrared spectroscopy oxygen desaturation slope during a 5-s arterial blood flow occlusion has been proposed as an estimation of the actual V̇O 2m . However, its correspondence with …
Test–retest reliability of skeletal muscle oxygenation measurement using near‐infrared spectroscopy during exercise in patients with sport‐related iliac artery flow limitation
The ankle-brachial index is an accurate tool for detecting claudication in atherosclerotic patients. However, this technique fails to identify subtle flow limitations of the iliac arteries (FLIA) in endurance athletes. Near-infrared spectroscopy …
Muscle-Skeletal Abnormalities and Muscle Oxygenation during Isokinetic Strength Exercise in Heart Failure with Preserved Ejection Fraction Phenotype: A Cross-Sectional Study
Exercise intolerance, a hallmark of patients with heart failure (HF), is associated with muscle weakness. However, its causative microcirculatory and muscle characteristics among those with preserved or reduced ejection fraction (HFpEF or HFrEF) …
Quantitative Changes in Muscular and Capillary Oxygen Desaturation Measured by Optical Sensors during Continuous Positive Airway Pressure Titration for Obstructive Sleep Apnea
Obstructive sleep apnea (OSA) is a common sleep disorder, and continuous positive airway pressure (CPAP) is the most effective treatment. Poor adherence is one of the major challenges in CPAP therapy. The recent boom of wearable optical sensors …
Repeated sprint training under hypoxia improves aerobic performance and repeated sprint ability by enhancing muscle deoxygenation and markers of angiogenesis in rugby sevens
Objective To evaluate the effects of repeated sprint (RS) training in hypoxia on aerobic performance, repeated sprint ability (RSA), and muscle oxygenation in Rugby Sevens. Methods Fourteen Rugby Sevens players were randomly allocated into hypoxic …
Age-related differences in muscle microvascular response and muscle oxygen uptake: a near infrared spectroscopy apporach
Background: Blood flow to the limbs has shown to be significantly reduced in elderly when compared to their younger counterparts. The knowledge on the effect of age on microvascular function is still limited. Near infrared spectroscopy (NIRS) is a …
Acute L-Citrulline Supplementation Increases Nitric Oxide Bioavailability but Not Inspiratory Muscle Oxygenation and Respiratory Performance
The present study aimed to investigate whether acute L-citrulline supplementation would affect inspiratory muscle oxygenation and respiratory performance. Twelve healthy males received 6 g of L-citrulline or placebo in a double-blind crossover …
Effect of Climbing Speed on Pulmonary Oxygen Uptake and Muscle Oxygen Saturation Dynamics in the Finger Flexors
Purpose : Although sport climbing is a self-paced whole-body activity, speed varies with climbing style, and the effect of this on systemic and localized oxygen responses is not well understood. Therefore, the aim of the present study was to …
Men exhibit faster skeletal muscle tissue desaturation than women before and after a fatiguing handgrip
The purpose was to test the hypothesis that sex and fatigue effect of the early phase of skeletal muscle tissue oxygenation (StO2, %) desaturation rate as well as that strength matched adults may exhibit similar responses. Twenty-four adults visited …
Running exercise with end-expiratory breath holding up to the breaking point induces large and early fall in muscle oxygenation
The goal of this study was to assess the effects of repeated running bouts with end-expiratory breath holding (EEBH) up to the breaking point on muscle oxygenation. Eight male runners participated in three randomised sessions each including two …
A randomized placebo-control trial of the acute effects of oxygen supplementation on exercise hemodynamics, autonomic modulation, and brain oxygenation in patients with pulmonary hypertension
Background: The integrative physiological effects of O2 treatment on patients with pulmonary hypertension (PH) during exercise, have not been fully investigated. We simultaneously evaluated, for the first time, the effect of oxygen supplementation on …
Are mode-specific differences in performance fatigability attributable to muscle oxygenation?
Purpose: The purpose of this study was to examine the composite, intra-individual, and inter-individual patterns of responses for deoxygenated hemoglobin and myoglobin (deoxy[heme]), oxygenated hemoglobin and myoglobin (oxy[heme]), total hemoglobin …
Impact of a submaximal mono-articular exercise on the skeletal muscle function of patients with sickle cell disease
Purpose Sickle cell disease (SCD) patients exhibit a limited exercise tolerance commonly attributed to anaemia, as well as hemorheological and cardio-respiratory abnormalities, but the functional status of skeletal muscle at exercise is unknown. …
Slight power output manipulations around the maximal lactate steady state have an impact on fatigue in females and males.
Neuromuscular fatigue (NMF) and exercise performance are affected by exercise intensity and sex differences. However, whether slight changes in power output (PO) below and above the maximal lactate steady-state (MLSS) impact NMF and subsequent …
Individual cardiovascular responsiveness to work-matched exercise within the moderate- and severe-intensity domains
Purpose: We investigated the cardiovascular individual response to 6 weeks (3×/week) of work-matched within the severe-intensity domain (high-intensity interval training, HIIT) or moderate-intensity domain (moderate-intensity continuous training, …