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With increasing demand and environmental concerns, researchers are exploring new materials that can perform as well or better than traditional materials while r

Author Alessandra Larini Author Carlo Aldinucci Author Velio Bocci Publication Institute of General Physiology, University of Siena, 53100, Siena, Italy PDF Download PDF Document Ozone as a modulator of the immune system Abstract In order to clarify the immunomodulating properties of ozone, we have investigated: a) the effects of stimulation on isolated peripheral human blood mononuclear cells (PBMC) from normal donors with either ozone or ozonated serum; b) the range (in terms of O3 concentrations) of the therapeutic window; c) the stimulatory and toxic effects and d) the pattern, of both proinflammatory and immunosuppressive cytokine production up to 86 hours after Read more

Background Hypoxic and cold environments have been shown to improve the function and performance of athletes. However, it is unclear whether the combination of subalpine conditions and cold temperatures may have a greater effect. The present study aims to investigate the effects of 6 weeks of training in a sub-plateau cold environment on the physical function and athletic ability of elite parallel giant slalom snowboard athletes. Methods Nine elite athletes (four males and five females) participated in the study. The athletes underwent 6 weeks of high intensity ski-specific technical training (150 min/session, six times/week) and medium-intensity physical training (120 min/session, six times/week) prior to the Beijing 2021 Winter Olympic Games test competition. The physiological and biochemical parameters were collected from elbow venous blood samples after each 2-week session to assess the athletes’ physical functional status. The athletes’ athletic ability was evaluated by measuring their maximal oxygen uptake, Wingate 30 s anaerobic capacity, 30 m sprint run, and race performance. Measurements were taken before and after participating in the training program for six weeks. The repeated measure ANOVA was used to test the overall differences of blood physiological and biochemical indicators. For indicators with significant time main effects, post-hoc tests were conducted using the least significant difference (LSD) method. The paired-samples t-test was used to analyze changes in athletic ability indicators before and after training. Results (1) There was a significant overall time effect for red blood cells (RBC) and white blood cells (WBC) in males; there was also a significant effect on the percentage of lymphocytes (LY%), serum testosterone (T), and testosterone to cortisol ratio (T/C) in females (p < 0.001 − 0.015, ${\eta }_{p}^{2}=0.81-0.99$ η p 2 = 0 . 81 − 0 . 99 ). In addition, a significant time effect was also found for blood urea(BU), serum creatine kinase (CK), and serum cortisol levels in both male and female athletes (p = 0.001 − 0.029, ${\eta }_{p}^{2}=0.52-0.95$ η p 2 = 0 . 52 − 0 . 95 ). (2) BU and CK levels in males and LY% in females were all significantly higher at week 6 (p = 0.001 − 0.038), while WBC in males was significantly lower (p = 0.030). T and T/C were significantly lower in females at week 2 compared to pre-training (p = 0.007, 0.008, respectively), while cortisol (C) was significantly higher in males and females at weeks 2 and 4 (p(male) = 0.015, 0.004, respectively; p(female) = 0.024, 0.030, respectively). (3) There was a noticeable increase in relative maximal oxygen uptake, Wingate 30 s relative average anaerobic power, 30 m sprint run performance, and race performance in comparison to the pre-training measurements (p < 0.001 − 0.027). Conclusions Six weeks of sub-plateau cold environment training may improve physical functioning and promote aerobic and anaerobic capacity for parallel giant slalom snowboard athletes. Furthermore, male athletes had a greater improvement of physical functioning and athletic ability when trained in sub-plateau cold environments.

Purpose To investigate the physiological mechanisms that explain the end-exercise decrease in oxygen uptake V ˙ O 2 during strenuous constant-power exercise, we recruited eleven trained, track cyclists. Methods On two separated days they performed 1) resting spirometric measures, followed by an incremental test on a cycle ergometer to determine the power output at V ˙ O 2 max P ‒ V ˙ O 2 max and 2) an exhaustive isokinetic supramaximal cycling exercise (Tlimsupra) at 185 ± 24% of P ‒ V ˙ O 2 max (i.e., 640.5 ± 50.8 W). During cycling exercise tests, V ˙ O 2 , ventilation parameters, stroke volume (SV) and heart rate were continuously recorded. Furthermore, arterialised capillary blood samples were collected to measure blood pH, arterial oxygen saturation, lactate and bicarbonate concentration before and 5 min after Tlimsupra. Results A > 5% decrease in V ˙ O 2 and/or SV was observed in 6 subjects, with 5 out of 6 subjects presenting both phenomena. The magnitude of the V ˙ O 2 decrease was correlated with the magnitude of the SV decrease (R = 0.75, P < 0.01), the peak-exercise end-tidal O2 partial pressure (R = 0.80, P < 0.005) and the resting, forced expiratory volume in 1 s (R = 0.72, P < 0.05), but not with any blood variables. The significant post-Tlimsupra decrease in forced vital capacity and forced inspiratory volume corroborate with a possible respiratory muscle fatigue. Conclusion Based on these findings, we demonstrate that the occurrence of V ˙ O 2 decrease in more than half of our subjects, during a strenuous constant-power exercise leading to a mild-acidosis (pH = 7.21 ± 0.04), results mainly from cardio-respiratory factors and not from blood metabolic responses.

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Methods for Measuring Greenhouse Gas Balances and Evaluating Mitigation Options in Smallholder Agriculture is an open access book designed to provide needed guidance for GHG measurement methods in smallholder agriculture

Clinical Question: In patients presenting to Primary Care with bowel symptoms, can a point-of-care calprotectin test differentiate between Inflammatory Bowel Disease (IBD) and Irritable Bowel Syndrome (IBS)?

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In medicine, venipuncture or venepuncture is the process of obtaining intravenous access for the purpose of venous blood sampling (also called phlebotomy) or intravenous therapy. In healthcare, this procedure is performed by medical laboratory scientists, medical practitioners, some EMTs, paramedics

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