Exertional heat stress promotes the presence of bacterial DNA in plasma: A counterbalanced randomised controlled trial

Journal of science and medicine in sport, Год журнала: 2024, Номер 27(9), С. 610 - 617

Опубликована: Сен. 1, 2024

ObjectivesThe primary aim was to explore the impact of exertional-heat stress (EHS) promoted exercise-associated bacteraemia. A secondary examine if an amino acid beverage (AAB) intervention may mitigate bacteraemia.DesignCounterbalanced randomised control trial.MethodsTwenty endurance trained male participants completed two EHS trials. On one occasion, consumed a 237 mL AAB twice daily for 7-days prior, immediately before and every 20 min during (2 h running at 60 % V̇O2max in 35 °C). other water volume (CON) equivalent consumed. Whole blood samples were collected pre- post-EHS, analysed plasma DNA concentration by fluorometer quantification after microbial extraction, bacterial relative abundance next generation 16 s rRNA gene sequencing.ResultsIncreased post-EHS observed on CON (pre-EHS 0.014 ng/μL, 0.039 ng/μL) (p < 0.001) 0.015 0.031 0.001). The magnitude change from post-exercise 40 lower, but no significant difference versus = 0.455). Predominant groups identified included: phyla-Proteobacteria (88.0 %), family-Burkholderiaceae (59.1 genus-Curvibacter (58.6 %). No variation absolute α-diversity phyla, family, genus CON.ConclusionThe increased presence microbial-bacterial systemic circulation response appears positive all participants. An supplementation period prior consumption did not provide attenuation EHS-associated

Язык: Английский

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The increase in core body temperature in response to exertional-heat stress can predict exercise-induced gastrointestinal syndrome

Temperature, Год журнала: 2023, Номер 11(1), С. 72 - 91

Опубликована: Май 12, 2023

Utilizing metadata from existing exertional and exertional-heat stress studies, the study aimed to determine if exercise-associated increase in core body temperature can predict change exercise-induced gastrointestinal syndrome (EIGS) biomarkers symptoms (Ex-GIS). Endurance-trained individuals completed 2 h of running exercise temperate (21.2-30.0°C) hot (35.0-37.2°C) ambient conditions (n = 132 trials). Blood samples were collected pre- post-exercise integrity systemic inflammatory cytokines. Physiological thermoregulatory strain variables assessed every 10-15 min during exercise. The strength linear relationship between maximal (M-Tre) (Δ Tre) rectal EIGS was determined via Spearman's rank correlation coefficients. While prediction simple multiple regression analyses dependent on screened Ex-GIS confounding factors. Significant positive correlations Tre maximum with I-FABP (rs 0.434, p < 0.001; rs 0.305, respectively), sCD14 0.358, 0.362, 0.001), response profile (SIR-Profile) (p total 0.05) observed. M-Tre Δ significantly predicted (adjusted R2) magnitude (R2(2,123)=0.164, R2(2,119)=0.058, 0.011; (R2(2,81)=0.249, R2(2,77)=0.214, SIR-Profile 0.05). Strong weak observed plasma concentrations I-FABP, sCD14, SIR-Profile, these

Язык: Английский

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Association between Infrared Thermography, Blood Count and Creatine Kinase in the Evaluation of the Welfare of Vaquejada Horses

Open Journal of Veterinary Medicine, Год журнала: 2023, Номер 13(06), С. 53 - 67

Опубликована: Янв. 1, 2023

The Quarter-Horses regularly participate in non-traditional sports that simulate activities on cattle ranches. In the vaquejada races, horses run at about 30 km/h, reaching maximum heart rates of around 200 bpm, indicating great physical effort during competitions and with could impact welfare. To test hypothesis can be evaluated for quality welfare through a combination non-invasive invasive methods, an experiment was developed aimed to assess thermography blood biomarkers before after races. Ten horses, which were regular competition, submitted vaquejadas racing used. Thermography performed 14 regions interest (head, neck thorax) following phases: pre-race +1, +4 +24 hours Blood samples collected pre-race, immediately Results ANOVA Tukey's test, p set 5%. showed local temperatures race races similar (p > 0.05), as well between +1 higher surface than first group (pre-race hours) 0.05) exercises. conclusion, by infrared analyses maintained well-being, physiological elevation several parameters recovery less 24 Thermographic images also able help analysis have contact harnesses, demonstrating use adequate correct equipment does not compromise animal

Язык: Английский

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Nourishing Physical Productivity and Performance On a Warming Planet - Challenges and Nutritional Strategies to Mitigate Exertional Heat Stress

Current Nutrition Reports, Год журнала: 2024, Номер 13(3), С. 399 - 411

Опубликована: Июль 12, 2024

Abstract Purpose of Review Climate change is predicted to increase the frequency and severity exposure hot environments. This can impair health, physical performance, productivity for active individuals in occupational athletic settings. review summarizes current knowledge recent advancements nutritional strategies minimize impact exertional-heat stress (EHS). Recent Findings Hydration limiting body mass loss < 3% during EHS are performance-beneficial weight-supported activities, although evidence regarding smaller fluid deficits (< 2% loss) weight-dependent activities less clear due a lack well-designed studies with adequate blinding. Sodium replacement requirements depends on both sweat losses extent replacement, quantified sodium only necessary once > 60–80% losses. Ice ingestion lowers core temperature may improve thermal comfort performance outcomes when consumed before, but so activity. Prevention management gastrointestinal disturbances should focus high carbohydrate low FODMAP availability before exercise, frequent provision and/or protein hydration, regulation. Evidence these approaches lacking Acute kidney injury potential concern resulting from inadequate post-EHS, emerging suggests that repeated exposures risk developing chronic disease. Summary Nutritional help regulate temperature, status EHS. Doing minimizes health safety optimizes warming planet.

Язык: Английский

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