Cardiovascular drift, the progressive increase in heart rate and decrease in stroke volume that begins after approximately 10 min of prolonged moderate-intensity exercise, is associated with decreased maximal oxygen uptake, particularly during heat stress. Consequently, the increased heart rate reflects an increased relative metabolic intensity during prolonged exercise in the heat when cardiov...

The purpose of the study was to examine the effect of moderate dose (5mg per kg) of caffeine ingestion on pulse rate, blood pressure(both systolic and diastolic) and energy expenditure (cal) during a steady state exercise period with a standardize power output as well as during a set time period, where participants were required to cycle with maximum effort. Eighteen healthy, overweight, sedent...

Rohrer, Daniel K., Eric H. Schauble, Kavin H. Desai, Brian K. Kobilka, and Daniel Bernstein. Alterations in dynamic heart rate control in the b1-adrenergic receptor knockout mouse. Am. J. Physiol. 274 (Heart Circ. Physiol. 43): H1184–H1193, 1998.—b1-Adrenergic receptors (b1-ARs) are key targets of sympathetic nervous system activity and play a major role in the beat-to-beat regulation of cardia...

The purpose of this study was to examine heart rate recovery (HRR) and linear/nonlinear heart rate variability (HRV) before and after resistance training. Fourteen young men (25.0 +/- 1.1 yr of age) completed a crossover design consisting of a 4-wk time-control period, 6 wk of resistance training (3 days/wk), and 4 wk of detraining. Linear HRV was spectrally decomposed using an autoregressive a...

BACKGROUND increasing age affects aerobic capacity, with an average loss of 10% or more per decade. AIM to determine the effect of ageing on the circulatory system in middle-aged men during 33 years of physical training. METHODS 15 men initially aged 45 years took part in an exercise training programme for 25-33 years. Nine serial measurements were made at rest and during maximal effort. Ae...

The aim of the study was to compare maximal and submaximal cardiorespiratory responses between progressive tests on a treadmill on land (TRE), and stationary running on land (SRL) and in water (SRW), while also comparing two methods of determining the second turn point (ST) (ventilatory curve and heart rate deflection point). The study sample consisted of nine active women (23 ± 1.94 years) tha...

Hanák J . , P . Jahn, R. Kabe‰, M. Sedl inská, Z. Îert , J . Mezerová, O. Chvátal : A Field Study of Oxygen Consumption and Estimated Energy Expenditure in the Exercising Horse. Acta Vet. Brno 2001, 70: 133-139. The major goal of this study was to estimate the aerobic and anaerobic contribution to energy expenditure in the running warmblood horse under field conditions. The oxygen consumption (...