Given a matrix A ∈ Rm×n (n vectors in m dimensions), we consider the problem of selecting a submatrix (subset of the columns) with maximum volume. The motivation to study such a problem is that if A can be approximately reconstructed from a small number k of its columns (A has “numerical” rank k), then any set of k independent columns of A should suffice to reconstruct A. However, numerical sta...

BACKGROUND AND PURPOSE Systolic blood pressure (SBP) during exercise has been found to predict a future diagnosis of hypertension, coronary heart disease, and cardiovascular disease death. No studies have been conducted to show a relationship between SBP during exercise test and stroke. The aim of the present study was to study the associations between SBP rise, percent maximum SBP at 2 minutes...

AIMS There is no non-invasive method to determine the individual optimum of maximum exercise heart rate. Knowledge of this value is of particular interest in patients with structural heart disease who are prone to tachycardia intolerance. The purpose of this study was to define the optimal maximum heart rate using cardiopulmonary exercise testing and exercise Doppler echocardiography and to com...

A pilot programme promoting fitness and exercise was launched through the local media in the Bournemouth area. The aim was to study the feasibility and effectiveness of a fitness testing programme as a trigger to increase exercise participation. Three hundred and eighty adult volunteers (male and female, all ages) undertook a sub-maximal fitness test and were given advice on exercise and diet b...

ABSTRACT Introduction: Maximum oxygen uptake is an effective indicator of the level human cardiopulmonary function and aerobic work capacity. Observing effects training formulating scientific plans are considerable value. Objective: To observe effect physical exercise on body's maximum arterial blood ketone body ratio. Methods: Before after 4 weeks exercise, uptake, lactic acid heart rate chang...

PURPOSE The purpose of this study was to identify a sport-specific assessment for elite race walking athletes by comparing physiological responses different types graded exercise test (GTX) protocols.METHODS Six completed two protocols in randomized crossover design with 1 week interval between trials. Exercise time, oxygen uptake (VO<sub>2</sub>), ventilation (VE), and heart rate (...

Sub-band speech recognition approaches have been proposed for robust speech recognition, where full-band power spectra are divided into several sub-bands and then likelihoods or cepstral vectors of the sub-bands are merged depending on their reliability. In conventional sub-band approaches, correlations across the sub-bands are not modeled and the merging weights can only be set experientially ...

BACKGROUND Measurement of variables of metabolic gas exchange during exercise is widely used to assess the severity of heart failure. The variables derived however, are potentially dependent on motivation of the patient and duration of exercise. METHODS The data from exercise tests in 23 patients with exertional breathlessness were analysed to derive the following three common indices of exer...

BACKGROUND Regular physical activity produces beneficial effects on health, but the exercise prescription needed to improve cardiovascular disease risk factors in free-living sedentary individuals remains unclear. METHODS Sedentary adults (N = 492, 64.0% women) were randomized to 1 of 4 exercise-counseling conditions or to a physician advice comparison group. The duration (30 minutes) and typ...