Purpose: The extent that enhanced ventricular function contributes to superior aerobic fitness of trained athletes is unclear. This study compared cardiovascular responses progressive cycle exercise in 12 adolescent soccer players and 10 untrained boys with assessment inotropic relaxation properties by Doppler ultrasound techniques. Methods: Resting cardiac dimensions were measured M-mode echocardiography. Stroke volume was estimated the technique, systolic peak aortic flow velocity ejection...

Exercise training results in a speeding of pulmonary oxygen uptake (VO2) kinetics at the onset exercise adults; however, only limited research has been conducted with children and adolescents.The aim present study was to examine VO2 muscle deoxygenation trained untrained male adolescents.Sixteen (15 +/- 0.8 yr, VO2peak = 54.7 6.2 mL x kg-1 min-1, self-assessed Tanner stage range 2-4) nine 0.6 43.1 5.2 adolescents performed two 6-min transitions from 3-min baseline 10 W workload equivalent...

In Ireland bovine babesiosis is caused by the tick-borne blood parasite, Babesia divergens. A survey of veterinary practitioners and farmers in 1980’s revealed an annual incidence 1.7% associated with considerable economic losses. However, two subsequent surveys 1990’s indicated a decline clinical babesiosis. Recent evidence from continental Europe suggests that, probably due to climate change, distribution tick vector B. divergens, Ixodes ricinus extending more northerly regions higher...

New Findings What is the central question of this study? Critical power (CP) represents highest work rate for which a metabolic steady state attainable. The physiological determinants CP are unclear, but research suggests that might be related to time constant phase II oxygen uptake kinetics ( ). main finding and its importance? We provide first evidence mechanistically CP. A reduction in supine position was observed alongside concomitant increase This effect may contingent on measures...

Physical activity and psychological well-being contribute to positive lifestyle in youngsters who have Type 1 diabetes. The aims of this study were objectively assess the physical levels children with diabetes, investigate associations between levels, HbA(1c). Thirty-six children, mean age 12.8 years, participated investigation. was assessed using heart rate monitoring over four days. Children further completed Diabetes Quality Life for Youths Questionnaire, Self-Perception Profile...

ABSTRACT Introduction/Purpose Critical power (CP) is a fundamental parameter defining high-intensity exercise tolerance; however, its physiological determinants are incompletely understood. The present study determined the impact of hyperoxia on CP, time constant phase II pulmonary oxygen uptake kinetics (τ V˙O2 ), and muscle oxygenation (assessed by near-infrared spectroscopy) in nine healthy men performing upright cycle ergometry. Methods was normoxia (fraction inspired O 2 = 0.5) via four...

What is the central question of this study? Critical power a fundamental parameter defining high-intensity exercise tolerance and related to phase II time constant pulmonary oxygen uptake kinetics ( τV̇O2 ). To test whether relationship causal, we assessed impact hyperoxia on critical during supine cycle exercise. main finding its importance? The results demonstrate that increased muscle oxygenation, reduced (i.e. sped up kinetics) and, subsequently, when compared with normoxia. These...

No studies to date have evaluated the relationship between exercise and microvascular function in youth with type 1 diabetes mellitus (T1DM). Twenty-nine complication free children adolescents T1DM were assessed for skin reactivity, aerobic fitness (VO2 peak ) physical activity. VO2 but not activity was significantly independently associated maximal hyperemia of microcirculation ( p < .01). significant associations found venoarte-riolar reflex (VAR) vasoconstriction or Aerobic may be an...

Background: The current study objectively assessed physical activity (PA) levels and patterns in children adolescents with type 1 diabetes compared the metabolic physiologic health profiles of those achieving not recommendation 60 minutes a day (minutes·D −1 ) at least moderate intensity PA. Method: 37 (20 boys, 17 girls) aged 12.7 ± 2.1 years (mean SD), disease duration 5.9 3.0 participated. PA was using heart rate monitoring. Peak VO 2 , BMI, sum 5 skinfolds, HbA 1c daily insulin dosage...

Critical power is a fundamental parameter defining high-intensity exercise tolerance, and related to the phase II time constant of pulmonary oxygen uptake kinetics (). Whether this relationship causative presently unclear. This study determined impact raised baseline work rate, which increases , on critical during upright cycle exercise. was via four constant-power tests exhaustion in two conditions: (1) with initiated from an unloaded cycling (U→S), (2) rate 90% gas exchange threshold...

We have previously demonstrated that the phase II time constant of pulmonary oxygen uptake kinetics () is an independent determinant critical power (CP) when O2 availability not limiting, is, during upright cycle exercise in young, healthy individuals. Whether this causative relationship remains impaired unknown. During supine exercise, which causes limitation transition, we therefore determined impact a raised baseline work rate on and CP. CP, , muscle oxygenation status (the latter via...

Patients with type 1 diabetes demonstrated slower oxygen uptake (V̇o 2 ) kinetics compared healthy control subjects. Furthermore, a prior bout of high-intensity exercise speeded V̇o and increased critical power in people diabetes. Prior muscle deoxygenation kinetics, indicating that are limited primarily by extraction and/or intracellular factors. These findings highlight the potential for interventions decrease metabolic inertia enhancing tolerance this condition.

The prevalence of musculoskeletal (MSK) conditions is increasing, and although current guidelines for physical activity attempt to combat this, many fail achieve the recommended targets. present study sought investigate whether regular tennis participation more effective at enhancing MSK function than meeting international guidelines.Tennis players will display significantly enhanced when compared with age-matched healthy active nonplayers.Cross-sectional study.Level 3.Ninety participants...

This study was designed to examine time-of-day effects on markers of cardiac functional capacity during a standard progressive cycle exercise test. Fourteen healthy, untrained young males (mean ± SD: 17.9 0.7 yrs age) performed identical maximal tests in the morning (08:00–11:00 h) and late afternoon (16:00–19:00 random order. Cardiac variables were measured at rest, submaximal exercise, by echocardiographic techniques. No differences testing values rest or observed for oxygen uptake, heart...

Orthostatic‐induced alterations in Doppler echocardiographic measures of ventricular function have not been well‐defined. Identifying such changes may provide useful insights regarding the responses these to variations loading conditions. Standard assessment mitral inflow velocity and tissue imaging (TDI) left longitudinal myocardial velocities was performed on 14 young males (mean age 17.9 ± 0.7 years) supine position then 5 minutes after assuming a sitting with legs dependent. Upon...

Little evidence exists with regard to changes in cardiac strain that occur during submaximal exercise young males. The aims of the study were evaluate longitudinal (L), radial (R), and endocardial circumferential ( EC ) upright cycle ergometry examine test–retest reproducibility these measurements. Fourteen recreationally active, adolescent (age: 17.9 ± 0.7 years) males volunteered for study. All subjects underwent an incremental (40 W) ergometer test. L, R, values obtained using speckle...

Abstract Objectives: Ventricular systolic functional response to exercise has been reported be superior in adult men compared women. This study explored myocardial responses maximal upright progressive late pubertal males and females. Methods: Doppler echocardiographic techniques were utilized estimate function a bout of cycle exercise. Results: Systolic capacity, as indicated by ejection rate (12.5 ± 2.8 13.1 1.0 [×10 −2 ] ml s −1 cm for boys girls, respectively) peak aortic velocity (208...