Search results for " EXERCISE"
showing 10 items of 1621 documents
Wheeze and asthma in children: associations with body mass index, sports, television viewing, and diet.
2008
Obesity, physical activity, and dietary habits are distinct but strongly interrelated lifestyle factors that may be relevant to the prevalence of wheeze and asthma in children. Our goal was to analyze the relationship of body mass index (BMI), regular sports participation, TV viewing, and diet with current wheezing and asthma.We investigated 20,016 children, aged 6-7 years, who were enrolled in a population-based study. Parents completed standardized questionnaires. Logistic regression was used to estimate odds ratios (ORs) and 95% confidence intervals (CIs), while adjusting for several confounders and simultaneously considering BMI, regular sports activity, TV viewing and selected dietary …
Signal characteristics of EMG during fatigue
1977
Electromyographic (EMG) activity of m. rectus femoris muscle was registered from young male and female subjects during maintained isometric knee extension at 60% of maximal voluntary contraction. The following EMG parameters were analyzed for the entire fatigue time: integrated EMG (IEMG), averaged motor unit potential (AMUP) and power spectral density function (PSDF). The results indicated a slight but continuous rise of IEMG during the fatigue period. AMUP showed sensitivity to fatigue with increase in amplitude, rise time, and number of spikes counted. PSDF was also easily affected by fatigue so that the total power density curve was shifted towards lower frequencies with a high frequenc…
Post-warm-up muscle temperature maintenance: blood flow contribution and external heating optimisation
2015
Passive muscle heating has been shown to reduce the drop in post-warm-up muscle temperature (T m) by about 25 % over 30 min, with concomitant sprint/power performance improvements. We sought to determine the role of leg blood flow in this cooling and whether optimising the heating procedure would further benefit post-warm-up T m maintenance. Ten male cyclists completed 15-min sprint-based warm-up followed by 30 min recovery. Vastus lateralis T m (T mvl) was measured at deep-, mid- and superficial-depths before and after the warm-up, and after the recovery period (POST-REC). During the recovery period, participants wore water-perfused trousers heated to 43 °C (WPT43) with either whole leg he…
Sex differences in response to cognitive stress during a fatiguing contraction
2009
This study compared the time to task failure for a submaximal fatiguing contraction in the presence and absence of a cognitive stressor in men and women. In study 1, 10 men and 10 women (22 ± 3 yr of age) performed an isometric fatiguing contraction at 20% maximal voluntary contraction force until task failure with the elbow flexor muscles during two separate sessions. Subjects performed a mental-math task during one of the fatiguing contractions that aimed to increase anxiety and stress (stressor session). Salivary cortisol and reported levels of arousal (visual analog scale for anxiety, and State-Trait Anxiety Inventory scores) were elevated during the stressor session compared with a co…
Peak Exercise Oxygen Uptake Predicts Recurrent Admissions in Heart Failure With Preserved Ejection Fraction
2018
Introduction and objectives: Heart failure with preserved ejection fraction (HFpEF) is a highly prevalent syndrome with an elevated risk of morbidity and mortality. To date, there is scarce evidence on the role of peak exercise oxygen uptake (peak VO2) for predicting the morbidity burden in HFpEF. We sought to evaluate the association between peak VO2 and the risk of recurrent hospitalizations in patients with HFpEF. Methods: A total of 74 stable symptomatic patients with HFpEF underwent a cardiopulmonary exercise test between June 2012 and May 2016. A negative binomial regression method was used to determine the association between the percentage of predicted peak VO2 (pp-peak V02) and rec…
Muscle strength and range of movement deficits 1 year after hip resurfacing surgery using posterior approach.
2009
The aim was to evaluate the effect of the posterior surgical approach on hip muscle strength and range of movement (ROM).Maximal isometric external and internal rotator strength of the hip muscles and bilateral leg extension strength were measured by dynamometers. Active (AROM) and passive (PROM) range of motion of the hip were measured by goniometers in 30 patients before and 3, 6 and 12 months after hip resurfacing. Postoperatively the patients were advised to return to their usual physical activities.Prior to the surgery internal rotation strength was on the same level on both sides, whereas external rotation strength of the operated hip was 26% (p0.001) lower compared with the unoperate…
Prognostication of post-infarct chronic heart failure: superiority of clinical assessment vs. cardiopulmonary and left ventricular function analysis.
2009
Prognostication of congestive heart failure post-myocardial infarction (MI) is important for decision making. We sought of a head-to-head comparison between the prognostic implication of clinical, cardiopulmonary, and left ventricular (LV) function assessment.Retrospectively, 100 consecutive post-MI patients (MI history 1418+/-1668 days ago) were stratified by NYHA functional classification system, cardiopulmonary exercise testing (CPX) [oxygen consumption at maximal exercise (VO(2max)) and at the anaerobic threshold (VO(2AT)) resulting in the Weber classification], and LV function analysis by M-mode and two-dimensional echocardiography [LV end-diastolic and -systolic diameter index (LVDDI …
Does increased serum creatine kinase activity reflect exercise-induced muscle damage in rats?
1995
To test a hypothesis that exercise-induced increase in serum creatine kinase activity and the concomitant necrotic muscle damage in unaccustomed rats may be interrelated phenomena, and that the first might largely be caused by changes in lymph flow, groups of rats were separately exposed to a swimming, combination of swimming and running, and running protocol. Their serum was then repeatedly analysed over a period of 72 h for creatine kinase activity, and their soleus and the red parts of quadriceps femoris muscles for beta-glucuronidase activity (damage marker) 72 h after the commencement of the experiment, i.e. at a moment when muscle damage is in the necrotic phase. The results clearly s…
Prednisolone decreases exercise-induced acid hydrolase response in mouse skeletal muscle.
1984
Male NMRI-mice were subjected to exhaustive treadmill exercise. 3 and 6 days after the exertion, quadriceps femoris muscles were examined histologically and analyzed for acid hydrolases in order to follow the degree and progress of injuries. Prednisolone (PRED), an anti-inflammatory corticosteroid, was given to some of the animals in order to modify the exercise response. The PRED administration began 14 h before exercise and continued until the end of the experiment (6 days). The doses were 25 and 50 mg . kg-1 i.p. twice a day. The activities of both arylsulphatase and beta-glucuronidase increased significantly in the exercise control group after 3 and 6 days. The increase in activity corr…
Effects of a physical exercise intervention on subjective physical well-being, psychosocial functioning and general well-being among office workers: …
2006
The purpose of the study was to examine the effects of a workplace physical exercise intervention on subjective physical well-being, psychosocial functioning and general well-being. The study was a cluster randomized-controlled trial with the department (n=4) as the unit of randomization. The subjects (n=90) were office workers [mean age 45.7 (SD 8.5) years]. Psychosocial functioning and well-being variables were measured by descriptive visual rating scales. The cross-over design consisted of one 15-week intervention period of light resistance training and guidance and another 15-week period of no training and no guidance. The statistical analysis was based on linear mixed models. The activ…