Different effects of two regeneration regimens on immunological parameters in cyclists

PURPOSE: To investigate the effect of 4-d active regeneration of different duration on immunological parameters after 2 wk of intensive training. METHODS: In a cross-over design 11 male cyclists conducted 13 d of intensive training followed by 4 d of low-intensity cycling for either 1 or 3 h each day (sequence randomized). Before the intensive training (test 1), between training and regeneration (test 2), and after the regeneration period (test 3), subjects were tested in the lab: venous blood sampling (immunological parameters; flow cytometry) and incremental exercise stage test on acycle ergometer. RESULTS: Average values of lymphocytes and natural killer (NK) cells decreased significantly from test 1 to test 2 and were influenced differently by 1- and 3-h cycling (P = 0.018 and 0.039, respectively); 1-h cycling restored values from test 1, whereas 3 h led to a further decrease in lymphocyte and NK cell concentrations. This pattern was resembled by the courses of maximal heart rate and maximal blood lactate concentration during incremental cycling exercise. In leukocytes, tests 2 and 3 differed significantly from test 1 (P = 0.048 and 0.031, respectively), but there was no significant effect of the regeneration duration (P = 039). Neither the concentration of neutrophils nor the neutrophil oxidative burst was significantly influenced by the training period or by one of the regeneration phases. CONCLUSIONS: The present results indicate that low-intensity regenerative training sessions in cyclists should preferably be conducted for shorter durations than 3 h. It was demonstrated that 4-d cycling of 1 h each day reversed ergometric and immunological changes indicative of fatigue after 2 wk of intensive training.     

Is lactic acidosis a cause of exercise induced hyperventilation at the respiratory compensation point?

Objectives: The respiratory compensation point (RCP) marks the onset of hyperventilation ("respiratory compensation") during incremental exercise. Its physiological meaning has not yet been definitely determined, but the most common explanation is a failure of the body's buffering mechanisms which leads to metabolic (lactic) acidosis. It was intended to test this experimentally.

Methods: During a first ramp-like exercise test on a cycle ergometer, RCP (range: 2.51–3.73 l*min^–1 oxygen uptake) was determined from gas exchange measurements in five healthy subjects (age 26–42; body mass index (BMI) 20.7–23.9 kg*m^–2; VO_2peak 51.3–62.1 ml*min^–1*kg^–1). On the basis of simultaneous determinations of blood pH and base excess, the necessary amount of bicarbonate to completely buffer the metabolic acidosis was calculated. This quantity was administered intravenously in small doses during a second, otherwise identical, exercise test.

Results: In each subject sufficient compensation for the acidosis, that is, a pH value constantly above 7.37, was attained during the second test. A delay but no disappearance of the hyperventilation was present in all participants when compared with the first test. RCP occurred on average at a significantly (p = 0.043) higher oxygen uptake (+0.15 l*min^–1) compared with the first test.

Conclusions: For the first time it was directly demonstrated that exercise induced lactic acidosis is causally involved in the hyperventilation which starts at RCP. However, it does not represent the only additional stimulus of ventilation during intense exercise. Muscle afferents and other sensory inputs from exercising muscles are alternative triggering mechanisms.

     

Clinical significance of increased cardiac troponins T and I in participants of ultra-endurance events

Of 105 asymptomatic finishers of endurance competitive events lasting several hours, increased blood concentrations of cardiac troponins T and I above the 99% upper reference values were found in 24 and 34 subjects, respectively; N-terminal pro-brain natriuretic peptide was also significantly increased. Within 3 months after the events, 21 troponin-positive participants underwent an extensive cardiac examination, which in all but 1 (critical coronary heart disease) revealed no signs of persistent cardiac damage.     

Kardiale Erkrankung bei Schizophrenie

A 63-year-old male patient diagnosed with chronic schizophrenia and characterized by formal disorders of thought with neologism and paranoid ideation, especially grandiose delusions and feelings of being influenced by radiation, is presented. At admission to psychiatric hospital, the patient reported attacks of weakness and dizziness, which he attributed to his feelings of alien influence. The diagnosis of cardiac disease with severe bradycardia could already be established by basic physical examination. Further diagnostic procedures (e.g., ECG) revealed symptomatic atrioventricular conduction defects (atrioventricular block III). After implantation of a cardiac pacemaker, the somatic symptoms vanished and the patient recovered completely in terms of physical condition.     

Electrolyte-Stimulated Biphasic Dissolution Profile and Stability Enhancement for Tablets Containing Drug-Polyelectrolyte Complexes

Purpose

Recently introduced drug-polyelectrolyte complexes prepared by hot-melt extrusion should be processed to solid dosage forms with tailor-made release properties. Their potential of stability enhancement should be investigated.

Methods

Milled hot-melt extruded naproxen-EUDRAGIT? E PO polyelectrolyte complexes were subsequently processed to double-layer tablets with varying complex loadings on a rotary-die press. Physicochemical interactions were studied under ICH guideline conditions and using the Gordon-Taylor equation. Sorption and desorption were determined to investigate the influence of moisture and temperature on the complex and related to stability tests under accelerated conditions.

Results

Naproxen release from the drug-polyelectrolyte complex is triggered by electrolyte concentration. Depending on the complex loading, phosphate buffer pH 6.8 stimulated a biphasic dissolution profile of the produced double-layer tablets: immediate release from the first layer with 65% loading and prolonged release from the second layer within 24?h (98.5% loading). XRPD patterns proved pseudopolymorphism for tablets containing the pure drug under common storage conditions whereas the drug-complex was stable in the amorphous state.

Conclusions

Drug-polyelectrolyte complexes enable tailor-made dissolution profiles of solid dosage forms by electrolyte stimulation and increase stability under common storage conditions.     

Plasma B vitamins and their relation to the severity of chronic heart failure

BACKGROUND: Total homocysteine (tHcy) has been linked to the severity of chronic heart failure (CHF). Elevated tHcy concentrations are mainly caused by folate and vitamin B-12 deficiencies. OBJECTIVE: We hypothesized that folate and vitamin B-12 deficiencies can explain the relation between tHcy and the severity of CHF. DESIGN: We investigated 987 CHF patients. All subjects underwent a physical examination and blood sampling. Cardiac catheterization was performed in 929 patients and echocardiography in 460 patients. Serum tHcy, folate, vitamin B-12, and N-terminal pro-B-type natriuretic-peptide (NT-proBNP) were measured and renal and hepatic function were studied. RESULTS: tHcy increased with increasing New York Heart Association (NYHA) classes of heart failure (P < 0.001) and correlated with the left ventricular ejection fraction (EF; r = -0.150, P < 0.001). Contrary to the hypothesis, vitamin B-12 (P < 0.001) increased with NYHA class (P < 0.001) and was negatively correlated with EF (r = -0.080, P = 0.015). Folate showed no relation with NYHA class or EF. Comparable results were obtained for NT-proBNP (tHcy: r = 0.27, P < 0.001; vitamin B-12: r = 0.091, P = 0.004; folate: r = -0.045, P = 0.169). The correlations between tHcy, EF, and NT-proBNP were significantly stronger in patients without coronary artery disease (CAD) than in those with CAD. Regression analysis showed that tHcy, but not B vitamins, is a strong predictor of EF and NT-proBNP. CONCLUSIONS: This study showed that tHcy, but not folate and vitamin B-12, is related to clinical, echocardiographic, and laboratory variables of CHF, which indicates a relation between tHcy and the severity of CHF. This relation is stronger in patients without CAD. The lack of association of folate and the paradoxical relation of vitamin B-12 with CHF can possibly be explained by a disturbance in hepatic homeostasis.     

Asylum seekers’ mental health and treatment utilization in a three months follow-up study after transfer from a state registration-and reception-center in Germany

Even though asylum seekers show a high prevalence of trauma-related disorders and comorbid psychological stress symptoms, little is known about how their mental health develops during the asylum process and what options of care are provided. We aimed to investigate the mental health and treatment utilization of asylum seekers after they were transferred from a state registration- and reception-center to municipal shelters in Germany. N = 228 asylum seekers with on-going asylum procedure were recruited in the psychosocial walk-in clinic located in a state registration- and reception-center. We firstly captured symptoms of posttraumatic stress, depression, anxiety disorders, quality of life, as well as alcohol or drug abuse. Subsequently we performed a follow-up after three months to evaluate a potential shift in symptoms and determining rates of access to treatment. In the pre-post psychometric assessment, there were statistically significant changes in depression (PHQ-2), panic (PHQ-PD) and psychosocial well-being scores (WHO-5). However, all these scores still remained within a clinical relevant range, respectively. Traumatic stress (PC-PTSD-5) and general anxiety scores (GAD-2) did not change significantly. Although N = 44 (66%) of the interviewed patients had been referred to psychotherapy initially, none (0%) of them had received outpatient psychotherapeutic treatment after three months. Our results emphasize a strong need for low-threshold, cultural adapted psychotherapeutic treatment for asylum seekers.