PortaMon
The gold-standard research device for the measurement of muscle oxygenation
Publications using the PortaMon
A comparison of the neuromuscular, cardiopulmonary and muscle oxygenation responses to single‐ and double‐leg cycling in older adults
Previous work in younger adults has shown that during small muscle mass exercise, the tolerable degree of neuromuscular impairment at task failure is greater than during large muscle mass exercise. However, no study has compared the neuromuscular …
Beetroot juice modulates physiological responses and accelerates recovery during the special judo performance: a randomized trial
The ability of nitrate (NO₃⁻)-rich beetroot juice (BJ) to improve exercise depends on training status. However, the mechanisms are understudied. The aim of this study was to investigate the impact of acute BJ supplementation on the Special Judo …
Combined effects of inspiratory and core muscle training on respiratory and core muscle function, limb muscle oxygenation and swimming performance
This study examined the effects of core training (CMT), inspiratory muscle training (IMT) and their combination (CIT) on strength and endurance of respiratory and core muscles, muscle oxygenation and swimming performance. Twenty-five competitive male …
Distinguishing Muscle Oxygen Saturation from Tissue Oxygen Saturation: Accuracy, Limitations, and Practical Utility in Muscle Oximetry
Muscle near-infrared spectroscopy (mNIRS) is widely used to measure skeletal muscle oxygen saturation, named as muscle-specific oxygen saturation (SmO₂) or tissue oxygen saturation (StO₂). The distinction between SmO₂ and the less specific …
Impaired microvascular reactivity in post-COVID-19 syndrome is independent of cardiorespiratory fitness
Current evidence demonstrates that patients who suffer from long-term SARS-CoV-2 symptoms [i.e., post-COVID-19 syndrome (PCS)] often present muscle fatigue and dyspnea. This is discussed to be a result of vascular dysfunction and oxidative stress …
Intradialytic neuromuscular electrical stimulation improves muscle oxygenation and aerobic capacity in end-stage renal disease: a single-blind, randomized controlled trial
Patients with end-stage renal disease (ESRD) undergoing hemodialysis (HD) often exhibit substantial impairments in aerobic capacity and skeletal muscle oxidative function, contributing to physical deconditioning and elevated cardiovascular risk. …
Effects of 6-day ischaemic preconditioning on adaptations to an altitude training camp in cross-country skiers
To determine whether ischaemic preconditioning (IPC) administered prior to an altitude training camp could enhance aerobic fitness and endurance performance in athletes. In a randomized controlled trial, 19 competitive (Tiers 3–5) cross-country (XC) …
Exercise Intensity but Not Cadence Affects the Dynamics of Muscle Oxygenation and Pulmonary Oxygen Uptake at the Onset of Exercise in Trained Cyclists
Purpose: This study examined how exercise intensity and pedaling cadence influence the on-transient kinetics of pulmonary oxygen uptake ( V˙O2) and muscle oxygenation in trained cyclists. Specifically, we evaluated responses during transitions to …
Inter-effort hypoxia recovery during high-intensity intermittent exercise enhances oxygen uptake at the onset of efforts while maintaining exercise tolerance
Exercise training in hypoxia enhances physiological adaptations improving exercise performance. However, acute hypoxia generally reduces high-intensity exercise tolerance, limiting its application in sports training. Here, we investigated whether …
Metabolic, V̇O$_textrm2$ kinetics, and muscle oxygenation responses at and above maximal lactate steady state in trained male rowers
This study aimed to compare physiological responses during rowing ergometer exercise at the maximal lactate steady state (MLSS) and 5% above the MLSS (MLSS+5%). Blood lactate concentration (BLC), oxygen uptake (V̇O2) kinetics, heart rate (HR), and …
Peak oxygen consumption is positively associated with estimates of oxygen extraction and microvascular blood volume in veterans with chronic kidney disease
Peak oxygen consumption (V_ O2peak) is reduced in patients with chronic kidney disease (CKD). Although cardiovascular and skeletal muscle factors are implicated in the declines of V_ O2peak, few studies have evaluated muscle oxygenation responses …
Preserved muscle oxidative capacity in COPD patients with hypoxemia treated by long term O2 therapy
Long-term oxygen therapy (LTOT) is an established treatment for patients with chronic obstructive pulmonary disease (COPD) diagnosed with hypoxemia at rest or during activity. Chronic hypoxemia is a potential mediator of loss of muscle mass and …
The effects of ischemic preconditioning and placebo maneuvers are similar during arm-cranking performance in upper-body trained athletes
This study aimed to examine the effects of local ischemic preconditioning (IPC) on 45 s arm-crank Wingate Anaerobic Test (WAnT) performance and accompanying physiological responses in athletes.
Thresholds Derived From Muscle NIRS Signal, Heart Rate Variability, and Ventilatory Parameters During an Incremental Cycling Test: An Agreement Analysis
This study aimed to compare different thresholds obtained from the muscle near-infrared spectroscopy (NIRS), heart rate variability (HRV), HR and ventilatory parameters during a maximal incremental cycling test. Twenty trained male cyclists performed …
Acute Effect of Inspiratory Muscle Training on Peripheral Tissue Oxygenation Behavior in Individuals With COPD: A Randomized Crossover Study
Background and Purpose Chronic Obstructive Pulmonary Disease (COPD) is a pulmonary condition characterized by airflow obstruction, which progresses with systemic alterations such as changes in muscle composition and metabolism, anticipating the …
Assessment of muscle oxygenation following eccentric exercise-induced muscle damage using near-infrared spectroscopy
Exercise-induced muscle damage (EIMD) disrupts muscle structure and function, impairing recovery and performance. Near-infrared spectroscopy (NIRS) offers a non-invasive method to assess muscle oxygenation, yet its sensitivity to EIMD-related changes …
The Acute Physiological Effects of Multiple Muscle Stimulation
Neuromuscular electrical stimulation (NMES) has been shown to provide health benefits similar to those of exercise. The aim of this study was to quantify the acute physiological effects of multiple muscle stimulation on the whole body and individual …
A Single Bout of Continuous Blood Flow Restriction Walking Does Not Negatively Affect Lower Limb Microvascular Function: Original Research
Introduction: Diminished macrovascular vasodilatory function has been reported following one blood flow restriction (BFR) walking bout. The primary aim was to investigate the potential effect that walking exercise (control, BFR) and cool-down …
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 …
Muscle oxygen consumption and microvascular function in healthy aging assessed by near-infrared spectroscopy: effect of adipose tissue thickness and physical fitness
A decline in skeletal muscle function is a key factor contributing to reduced functional capacity and quality of life with aging. While the mechanisms are multifactorial, impairments in mitochondrial and microvascular function are believed to play a …