Introduction: Heart secretes hormones such as natriuretic peptide. The purpose of this study was to investigate the effects of 12 weeks of resistance training on these hormones. Methods: Twenty four healthy men (Mean age ± SD: 24.9 ± 3.2 years) were randomly allocated to experimental and control groups. Subjects in the experimental group performed a 12-week resistance training program, 3 ses...

Parathyroid hormone (PTH) changes morphology of osteoclasts within minutes after its systemic administration. The aim of our study was to test in healthy men whether both exogenous and endogenous PTH could change acutely (minutes to hours) the serum cross-linked C-telopeptide of type I collagen (beta CTX), which is released during osteoclastic resorption of bone. Twelve healthy men (age range 2...

Measurements of the lowest mouth pressures developed during maximum static inspiratory efforts are related to the recoil force of the lung and occasionally are influenced by glottic closure. The measurement of minimal pleural pressures (P pl min) over the entire range of inspiratory capacity eliminates both problems and, in addition, provides a good estimate of the subject's cooperation. Using ...

BACKGROUND Although the effect of maternal age on fertility is well known, it is unclear whether paternal age also affects fertility. This cross-sectional study sought to characterize the association between age and semen quality, a well-known proxy of fertility status. METHODS A convenience sample of 97 non-smoking men (aged 22-80 years) without known fertility problems was recruited from a ...

BACKGROUND Baroreflex buffering is an important mechanism in arterial blood pressure control. The effect of healthy (physiological) aging on tonic baroreflex buffering in humans is unknown. METHODS AND RESULTS Baroreflex buffering was determined in 27 young (aged 25+/-1 years) and 16 older (aged 65+/-1 years) healthy normotensive men by measuring the potentiation of the systolic blood pressur...

BACKGROUND AND AIMS Hyperparathyroidism is a risk factor for bone loss. An age-related increase in parathyroid hormone (PTH) level has been demonstrated in several studies. It has been suggested that the type II osteoporotic syndrome, a condition of increased prevalence among elderly women, may be at least partially caused by elevations in intact parathyroid hormone (iPTH) levels. To date, howe...