Recently, the European Respiratory Journal published a paper by GULMANS et al. [1] on reference values for maximal work capacity (Wmax) in healthy children [1]. The paper described the Wmax of boys and girls using a model which related Wmax per kilogram of fat free mass (FFM) to age and gender. For the model to be valid the relationship between Wmax and FFM should have been a proportionality (i...

Exercise performance is associated with physical development. For sick children, there is a need for parameters reflecting exercise performance, which should be easy to measure and should take their nutritional state into account. The aim of this study was to investigate the relationship between maximum work-load (Wmax) and body weight (BW) as well as fat-free mass (FFM) in healthy children per...

BACKGROUND In patients with chronic lung diseases, the work rate for endurance training is calculated by the maximal work rate (Wmax). Because the assessment bears side effects, a prediction by easier accessible tests would be of practical use. OBJECTIVE We addressed the reliability of predicting Wmax on the basis of the 6-min walk distance (6MWD) test and a set of further parameters in patie...

This study assessed the reproducibility of performance and selected metabolic variables during a variable high-intensity endurance cycling test. 8 trained male cyclists (age: 35.9 ± 7.7 years, maximal oxygen uptake: 54.3 ± 3.9 mL·kg - 1·min - 1) completed 4 high-intensity cycling tests, performed in consecutive weeks. The protocol comprised: 20 min of progressive incremental exercise, where the...

Time to symptom limitation (Tlim) achieved during constant work rate tests is considerably more responsive change than measures commonly recorded ramp-based tests, such as peak of oxygen uptake and maximal (Wmax). There limited literature on the use of, physiological responses to, cycle ergometry in people with cystic fibrosis (CF). The results this study provide evidence that test, when conduc...

We measured pressures and power of diaphragm, rib cage, and abdominal muscles during quiet breathing (QB) and exercise at 0, 30, 50, and 70% maximum workload (Wmax) in five men. By three-dimensional tracking of 86 chest wall markers, we calculated the volumes of lung- and diaphragm-apposed rib cage compartments (Vrc,p and Vrc,a, respectively) and the abdomen (Vab). End-inspiratory lung volume i...

OBJECTIVE This study assessed the agreement between cardiac output (Q) measurements generated by two indirect methods and their applicability in 54 men and 77 women (aged 60-90). METHODS The subjects performed a cardiopulmonary test with incremental to maximal exercise on a cycle-ergometer. "Q" was estimated based on oxygen uptake and on impedance cardiography at 50% and 100% of the maximal w...

BACKGROUND Increasing numbers of survivors of preterm birth are growing into adulthood today. Long-term health-effects of prematurity are still poorly understood, but include increased risk for diabetes, obesity and cardiovascular diseases in adult life. To test if reduced physical fitness may be a link in the causal chain of preterm birth and diseases in later life, the association of preterm ...

We investigated whether 12 weeks of rehabilitation at home in patients with chronic obstructive pulmonary disease (COPD) had a beneficial effect on lactate production, metabolic gas exchange data, workload of the inspiratory muscles, and dyspnoea during a maximal bicycle ergometer test. A second aim was to assess whether a change in dyspnoea was related to a change of inspiratory muscle workloa...

As a special class of linear codes, minimal linear codes have important applications in secret sharing and secure two-party computation. Constructing minimal linear codes with new and desirable parameters has been an interesting research topic in coding theory and cryptography. Ashikhmin and Barg showed that wmin/wmax > (q− 1)/q is a sufficient condition for a linear code over the finite field ...