PortaMon
The gold-standard research device for the measurement of muscle oxygenation
Publications using the PortaMon
Ischemic preconditioning increases muscle perfusion, oxygen uptake, and force in strength-trained athletes
Muscle ischemia and reperfusion induced by ischemic preconditioning (IPC) can improve performance in various activities. However, the underlying mechanisms are still poorly understood. The purpose of this study was to examine the effects of IPC on …
Near-infrared spectroscopy and skeletal muscle oxidative function in vivo in health and disease: a review from an exercise physiology perspective
In most daily activities related to work or leisure, the energy for muscle work substantially comes from oxidative metabolism. Functional limitations or impairments of this metabolism can significantly affect exercise tolerance and performance. As a …
Oxygenation, local muscle oxygen consumption and joint specific power in cycling: the effect of cadence at a constant external work rate
Purpose: The present study investigates the effect of cadence on joint specific power and oxygenation and local muscle oxygen consumption in the vastus lateralis and vastus medialis in addition to the relationship between joint specific power and …
The effect of recovery duration on vastus lateralis oxygenation, heart rate, perceived exertion and time motion descriptors during small sided football games
Purpose Small sided games (SSG) of football are an effective and efficient format to simultaneously train the physiological, technical, and tactical components of football. The duration of the recovery period between bouts of SSG will affect the …
Effect of acute hypoxia on inspiratory muscle oxygenation during incremental inspiratory loading in healthy adults
Purpose: To non-invasively examine the effect of acute hypoxia and inspiratory threshold loading (ITL) on inspiratory muscles [sternocleidomastoid (SCM), scalene (SA) and parasternal (PS)] oxygenation in healthy adults using near-infrared …
Evaluation of muscle oxygenation by near infrared spectroscopy in patients with facioscapulohumeral muscular dystrophy
The purpose of the study was to determine muscle metabolism adaptation to exercise in facioscapulohumeral muscular dystrophy patients (FSHD) and to study the correlation with clinical functional status (6-min walk test).8 FSHD patients and 15 …
Excess VO2 during ramp exercise is positively correlated to intercostal muscles deoxyhemoglobin levels above the gas exchange threshold in young trained cyclists
We assessed respiratory muscles oxygenation responses during a ramp exercise to exhaustion and further explored their relationship with the non-linear increase of VO2 (VO2 excess) observed above the gas-exchange threshold. Ten male cyclists completed …
Ischemic preconditioning reduces hemodynamic response during metaboreflex activation
Ischemic preconditioning (IP) has been shown to improve exercise performance and to delay fatigue. However, the precise mechanisms through which IP operates remain elusive. It has been hypothesized that IP lowers the sensation of fatigue by reducing …
Noninvasive measurement of lower extremity muscle oxygen extraction fraction under cuff compression paradigm
Background To demonstrate the feasibility of using a susceptibility-based MRI technique with asymmetric spin-echo (ASE) sequence to assess the lower extremity muscle oxygen extraction fraction (OEF) alternations under cuff compression paradigm. …
Oxygenation threshold derived from near- Infrared spectroscopy: Reliability and its relationship with the first ventilatory threshold
Background Near-infrared spectroscopy (NIRS) measurements of oxygenation reflectO2 delivery and utilization in exercising muscle and may improve detection of a critical exercise threshold. Purpose First, to detect an oxygenation breakpoint …
Recent developments in near-infrared spectroscopy (NIRS) for the assessment of local skeletal muscle microvascular function and capacity to utilise oxygen
Purpose of review Continuous wave near infrared spectroscopy (CW NIRS) provides non-invasive technology to measure relative changes in oxy- and deoxy-haemoglobin in a dynamic environment. This allows determination of local skeletal muscle O2 …
Separate and combined effects of a 10-d exposure to hypoxia and inactivity on oxidative function in vivo and mitochondrial respiration ex vivo in humans
An integrative evaluation of oxidative metabolism was carried out in 9 healthy young men (age, 24.1 1.7 yr mean=SD) before (CTRL) and after a 10-day horizontal bed rest carried out in normoxia (N-BR) or hypoxia (H-BR, FIO2 0.147). H-BR was designed …
The effect of active versus passive recovery periods during high intensity intermittent exercise on local tissue oxygenation in 18-30 year old sedentary men
Purpose: High intensity interval training (HIIT) has been proposed as a time-efficient format of exercise to reduce the chronic disease burden associated with sedentary behaviour. Changes in oxygen utilisation at the local tissue level during an …
The effect of short and long term endurance training on systemic, and muscle and prefrontal cortex tissue oxygen utilisation in 40-60 year old women
Purpose: Aerobic endurance training (ET) increases systemic and peripheral oxygen utilisation over time, the adaptation pattern not being linear. However, the timing and mechanisms of changes in oxygen utilisation, associated with training beyond one …
The relation between cardiac output kinetics and skeletal muscle oxygenation during moderate exercise in moderately impaired patients with chronic heart failure
Oxygen uptake (V? O2) kinetics are prolonged in patients with chronic heart failure (CHF). This may be caused by impaired oxygen delivery or skeletal muscle derangements. We investigated whether impaired cardiac output (Q? ) kinetics limit skeletal …
Topical application of cream containing nonivamide and nicoboxil does not enhance the performance of experienced cyclists during a 4-km time-trial
Purpose: Topical application of nonivamide–nicoboxil cream to resting legs has been shown to enhance the level of oxygenated haemoglobin in leg muscles 15 min later. Here, we examined whether such application improves the performance of experienced …
The physiological responses to repeated upper-body sprint exercise in highly trained athletes
Purpose: To study performance, physiological and biomechanical responses during repeated upper-body sprint exercise. Methods: Twelve male elite cross-country skiers performed eight 8-s maximal poling sprints with a 22-s recovery while sitting on a …
Skeletal muscle oxidative capacity in patients with cystic fibrosis
New Findings: What is the central question of this study? Do patients with cystic fibrosis have reduced skeletal muscle oxidative capacity, measured with near-infrared spectroscopy, compared with demographically matched control subjects? What is the …
Optical diagnosis of lower urinary tract infection: A pilot study in children
Conventionally, diagnosis of lower urinary tract infection (LUTI) is made on the basis of history, urine microscopy and culture. But there are limitations to this methodology especially in children and special populations where there is difficulty in …