scholarly journals Low ventilatory responsiveness to transient hypoxia or breath-holding predicts fast marathon performance in healthy middle-aged and older men

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bartłomiej Paleczny ◽  
Rafał Seredyński ◽  
Małgorzata Wyciszkiewicz ◽  
Adrianna Nowicka-Czudak ◽  
Wojciech Łopusiewicz ◽  
...  
Keyword(s):  
Plasma Renin ◽  
Older Men ◽  
Individual Performance ◽  
Breath Holding ◽  
Vasomotor Tone ◽  
Younger Men ◽  
The Individual ◽  
Peripheral Chemoreflex ◽  
Sympathetic Vasomotor Tone ◽  
Marathon Performance

AbstractThe aim of this study was to test the utility of haemodynamic and autonomic variables (e.g. peripheral chemoreflex sensitivity [PCheS], blood pressure variability [BPV]) for the prediction of individual performance (marathon time and VO2max) in older men. The post-competition vasodilation and sympathetic vasomotor tone predict the marathon performance in younger men, but their prognostic relevance in older men remains unknown. The peripheral chemoreflex restrains exercise-induced vasodilation via sympathetically-mediated mechanism, what makes it a plausible candidate for the individual performance marker. 23 men aged ≥ 50 year competing in the Wroclaw Marathon underwent an evaluation of: resting haemodynamic parameters, PCheS with two methods: transient hypoxia and breath-holding test (BHT), cardiac barosensitivity, heart rate variability (HRV) and BPV, plasma renin and aldosterone, VO2max in a cardiopulmonary exercise test (CPET). All tests were conducted twice: before and after the race, except for transient hypoxia and CPET which were performed once, before the race. Fast marathon performance and high VO2max were correlated with: low ventilatory responsiveness to hypoxia (r =  − 0.53, r = 0.67, respectively) and pre-race BHT (r =  − 0.47, r = 0.51, respectively), (1) greater SD of beat-to-beat SBP (all p < 0.05). Fast performance was related with an enhanced pre-race vascular response to BHT (r =  − 0.59, p = 0.005). The variables found by other studies to predict the marathon performance in younger men: post-competition vasodilation, sympathetic vasomotor tone (LF-BPV) and HRV were not associated with the individual performance in our population. The results suggest that PCheS (ventilatory response) predicts individual performance (marathon time and VO2max) in men aged ≥ 50 yeat. Although cause-effect relationship including the role of peripheral chemoreceptors in restraining the post-competition vasodilation via the sympathetic vasoconstrictor outflow may be hypothesized to underline these findings, the lack of correlation between individual performance and both, the post-competition vasodilation and the sympathetic vasomotor tone argues against such explanation. Vascular responsiveness to breath-holding appears to be of certain value for predicting individual performance in this population, however.

scholarly journals Intact peripheral chemoreflex regulation of sympathetic vasomotor tone in breath hold divers after detraining period

2009 ◽  
Vol 23 (S1) ◽  
Author(s):  
Toni Breskovic ◽  
Zoran Valic ◽  
Axel Lipp ◽  
Karsten Heusser ◽  
Vladimir Ivancev ◽  
...  
Keyword(s):  
Breath Hold ◽  
Vasomotor Tone ◽  
Peripheral Chemoreflex ◽  
Sympathetic Vasomotor Tone

Peripheral chemoreflex regulation of sympathetic vasomotor tone in apnea divers

2009 ◽  
Vol 20 (2) ◽  
pp. 57-63 ◽  
Author(s):  
Toni Breskovic ◽  
Zoran Valic ◽  
Axel Lipp ◽  
Karsten Heusser ◽  
Vladimir Ivancev ◽  
...  
Keyword(s):  
Vasomotor Tone ◽  
Peripheral Chemoreflex ◽  
Sympathetic Vasomotor Tone

Baroreflex Sensitivity Assessment – Latest Advances and Strategies

2011 ◽  
Vol 7 (2) ◽  
pp. 89 ◽  
Author(s):  
Maria Teresa La Rovere ◽  
Roberto Maestri ◽  
Gian Domenico Pinna ◽  
◽  
◽  
...  
Keyword(s):  
Baroreflex Sensitivity ◽  
Carotid Sinus ◽  
Lower Blood Pressure ◽  
Vasomotor Tone ◽  
Sensitivity Assessment ◽  
Lower Blood ◽  
Prognostic Implications ◽  
Novel Therapeutic Strategies ◽  
Sympathetic Vasomotor Tone ◽  
Stimulation Of

The baroreflex mechanism has been recognised as a key part of cardiovascular regulation. Alterations in the baroreceptor-heart rate reflex (baroreflex sensitivity [BRS]) contribute to sympathetic–parasympathetic imbalance, playing a major role in the development and progression of many cardiovascular disorders. Therefore, the measurement of the baroreflex is a source of valuable information in the clinical management of cardiac disease patients. This article reviews the most relevant advances for the measurement of BRS and their clinical and prognostic implications. Novel therapeutic strategies, exploring the use of electrical stimulation of the carotid sinus, have been evaluated recently in experimental and preliminary clinical studies to lower blood pressure and to reduce the level of baroreflex-mediated sympathoexcitation in heart failure. A recent study has also shown that the implementation of an artificial baroreflex system to regulate sympathetic vasomotor tone automatically is feasible.

Pengaruh Kesesuaian Tugas-Teknologi, Kepercayaan dan Efektivitas Sistem Informasi Akuntansi Terhadap Kinerja Individu pada Pasar Swalayan di Kota Tangerang

2013 ◽  
Vol 5 (2) ◽  
pp. 62-80
Author(s):  
Agnes Ashianti ◽  
Albertus Fani
Keyword(s):  
Information Systems ◽  
Accounting Information ◽  
Individual Performance ◽  
Primary Data ◽  
Accounting Information System ◽  
Accounting Information Systems ◽  
Study Test ◽  
Task Technology Fit ◽  
The Individual ◽  
Systems Effectiveness

The objective of this research is to examine the effect of task-technology fit, trust of accounting information systems, and effectiveness of accounting information systems on the individual performance at a supermarket in Tangerang city.  The samples in this study were employees of a supermarket in Tangerang city who used accounting information system in doing its job. The data used in this study is primary data through questionnaires. In data analysis techniques, this study test the reliability of the formula coefficient of Cronbach 's Alpha, validity test by means of correlation using the r counted and r table, test for normality using Kolmogorov-Smirnov test, the classical assumption, hypothesis testing multiple linear regression, t test, and F test. The results showed that the task-technology fit and trust of accounting information systems each have a significant effect on the individual performance, while the effectiveness of accounting information systems does not significantly influence the individual performance. Task-technology fit, trust of accounting information systems, and the effectiveness of accounting information systems have simultaneous significant effect on the individual performance. Keyword: Task-Technology Fit, Trust of Accounting Information Systems, Effectiveness of Accounting Information Systems, Individual Performance..

Peer Effects on Individual Performance in a Team Sport

2021 ◽  
pp. 152700252110003
Author(s):  
Mariia Molodchik ◽  
Sofiia Paklina ◽  
Petr Parshakov
Keyword(s):  
Video Game ◽  
Peer Effects ◽  
Team Sport ◽  
Individual Performance ◽  
Team Cohesion ◽  
Soccer Players ◽  
Marginal Benefit ◽  
The Individual

The paper investigates the variety of peer effects on individual performance in a team sport. The individual performance of more than 5,000 soccer players, from 234 teams, between 2010 and 2015, is measured with the help of the FIFA video game simulator developed by EA Sports. The study reveals positive peer effects on individual performance although the marginal benefit decreases. Additionally, team cohesion contributes to an improvement of players’ ranking.

scholarly journals RR1. Safety of Carotid Stenting (CAS) Is Based on the Center Experience More than on the Individual Performance

2012 ◽  
Vol 55 (6) ◽  
pp. 85S-86S ◽  
Author(s):  
Gianbattista Parlani ◽  
Paola De Rango ◽  
Fabio Verzini ◽  
Enrico Cieri ◽  
Gioele Simonte ◽  
...  
Keyword(s):  
Carotid Stenting ◽  
Individual Performance ◽  
The Individual

scholarly journals Increasing plant group productivity through latent genetic variation for cooperation

2019 ◽  
Author(s):  
Samuel E. Wuest ◽  
Nuno D. Pires ◽  
Shan Luo ◽  
Francois Vasseur ◽  
Julie Messier ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Group Testing ◽  
Individual Performance ◽  
Major Effect ◽  
Root Competition ◽  
Simple Method ◽  
Pleiotropic Gene ◽  
Selective Forces ◽  
Future Demands ◽  
The Individual

AbstractTechnologies for crop breeding have become increasingly sophisticated, yet it remains unclear whether these advances are sufficient to meet future demands. A major challenge with current crop selection regimes is that they are often based on individual performance. This tends to select for plants with “selfish” traits, which leads to a yield loss when they compete in high-density stands. In traditional breeding, this well-known “tragedy of the commons” has been addressed by anticipating ideotypes with presumably preferential characteristics. However, this approach is limited to obvious architectural and physiological traits, and it depends on a mechanistic understanding of how these modulate growth and competition. Here, we developed a general and simple method for the discovery of alleles promoting cooperation of plants in stands; it is based on the game-theoretical premise that alleles increasing cooperation incur a cost to the individual but benefit the monoculture group. Testing the approach using the model plant Arabidopsis thaliana, we found a single major effect locus where the rarer allele was associated with increased levels of cooperation and superior monoculture productivity. We show that the allele likely affects a pleiotropic regulator of growth and defense, since it is also associated with reduced root competition but higher race-specific resistance against a specialized parasite. Even though cooperation is considered evolutionarily unstable, conflicting selective forces acting on a pleiotropic gene might thus maintain latent genetic variation for it in nature. Such variation, once identified in a crop, could be rapidly leveraged in modern breeding programs and provide efficient routes to increase yields.

scholarly journals COMBINING DATA-DRIVEN AND NUMERICAL MODELLING APPROACHES TO STORM EROSION PREDICTION

2020 ◽  
pp. 38
Author(s):  
Joshua Simmons ◽  
Kristen Splinter
Keyword(s):  
Numerical Models ◽  
Individual Performance ◽  
Study Data ◽  
Data Driven ◽  
Erosion Prediction ◽  
Trade Offs ◽  
Combining Data ◽  
Erosion Models ◽  
Using Data ◽  
The Individual

Physics-based numerical models play an important role in the estimation of storm erosion, particularly at beaches for which there is little historical data. However, the increasing availability of pre-and post-storm data for multiple events and at a number of beaches around the world has opened the possibility of using data-driven approaches for erosion prediction. Both physics-based and purely data-driven approaches have inherent strengths and weaknesses in their ability to predict storm-induced erosion. It is vital that coastal managers and modelers are aware of these trade-offs as well as methods to maximise the value from each modelling approach in an increasingly data-rich environment. In this study, data from approximately 40 years of coastal monitoring at Narrabeen-Collaroy Beach (SE Australia)has been used to evaluate the individual performance of the numerical erosion models SBEACH and XBeach, and a data-driven modelling technique. The models are then combined using a simple weighting technique to provide a hybrid estimate of erosion.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/v53dZiO8Y60

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