المؤلفون: Feigin, Evgeny, Lanini, Martina, Micheli, Matteo, Pütz, Alexander

مصطلحات موضوعية: Mathematics - Representation Theory, Mathematics - Algebraic Geometry, Mathematics - Combinatorics

الوصف: The goal of this paper is to extend the quiver Grassmannian description of certain degenerations of Grassmann varieties to the symplectic case. We introduce a symplectic version of quiver Grassmannians studied in our previous papers and prove a number of results on these projective algebraic varieties. First, we construct a cellular decomposition of the symplectic quiver Grassmannians in question and develop combinatorics needed to compute Euler characteristics and Poincar\'e polynomials. Second, we show that the number of irreducible components of our varieties coincides with the Euler characteristic of the classical symplectic Grassmannians. Third, we describe the automorphism groups of the underlying symplectic quiver representations and show that the cells are the orbits of this group. Lastly, we provide an embedding into the affine flag varieties for the affine symplectic group.

الوصول الحر: http://arxiv.org/abs/2407.00654Test

المؤلفون: Cebrián-Ponce Álex, Petri Cristian, Izzicupo Pascal, Micheli Matteo Levi, Cortis Cristina, Fusco Andrea, Carrasco-Marginet Marta, Mascherini Gabriele

المساهمون: Cebrián-Ponce, Álex, Petri, Cristian, Izzicupo, Pascal, Micheli Matteo, Levi, Cortis, Cristina, Fusco, Andrea, Carrasco-Marginet, Marta, Mascherini, Gabriele

مصطلحات موضوعية: urine, phase angle, bioelectrical, BIVA, team sport

الوصف: Background: Hydration status has a direct role in sports performance. Bioelectrical Impedance Vector Analysis (BIVA) and Urine Specific Gravity (USG) are commonly used to assess hydration. The study aims to identify the sensitivity and relationship between BIVA and USG in a field sports setting. Methods: BIVA and USG measurements were conducted five times throughout one rugby season. 34 elite male rugby players (25.1 ± 4.4 years; 184.0 ± 7.8 cm; 99.9 ± 13.4 kg) were enrolled. Differences over time were tested using one-way repeated measures ANOVA, and Bonferroni’s post-hoc test was applied in pairwise comparisons. Resistance-reactance graphs and Hotelling’s T2 test were used to characterize the sample and to identify bioelectrical changes. A repeated measures correlation test was conducted for BIVA-USG associations. Results: Two clear trends were seen: (1) from July to September, there was a vector shortening and an increase of the phase angle (p < 0.001); and (2) from December to April, there was a vector lengthening and a decrease of the phase angle (p < 0.001). USG reported neither changes nor correlation with BIVA longitudinally (p > 0.05). Vector variations indicated a body fluid gain (especially in the intracellular compartment) and a body cell mass increase during the preseason, suggesting a physical condition and performance improvement. During the last months of the season, the kinetic was the opposite (fluid loss and decreased body cell mass). Conclusions: Results suggested that BIVA is sensitive to physiological changes and a better option than USG for assessing hydration changes during a rugby sports season.

وصف الملف: ELETTRONICO

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:001056171000001; volume:11; issue:8; firstpage:142; numberofpages:9; journal:SPORTS; https://hdl.handle.net/11564/812051Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85169067661; https://www.mdpi.com/2075-4663/11/8/142Test

الإتاحة: https://doi.org/10.3390/sports11080142Test
https://hdl.handle.net/11564/812051Test
https://www.mdpi.com/2075-4663/11/8/142Test

المؤلفون: Petri, Cristian, Micheli, Matteo Levi, Izzicupo, Pascal, Timperanza, Niccolò, Lastrucci, Tommaso, Vanni, Daniele, Gulisano, Massimo, Mascherini, Gabriele

المساهمون: Petri, Cristian, Micheli, Matteo Levi, Izzicupo, Pascal, Timperanza, Niccolò, Lastrucci, Tommaso, Vanni, Daniele, Gulisano, Massimo, Mascherini, Gabriele

مصطلحات موضوعية: body composition, bodybuilding, muscle ma, muscle hypertrophy

الوصف: Bodybuilders are athletes characterized by high muscle mass. During competitions, the evaluation is performed based on aesthetic parameters. The study aims to provide normative references of body composition with the vector bioimpedance methodology (BIVA). A second aim is to compare BIVA assessments performed on both sides and the upper and lower body. A group of 68 elite bodybuilders (41 males aged 30.1 ± 9.2 years and 27 females aged 32.1 ± 8.0 years) was enrolled. A BIVA assessment was performed the day before the 2021 World Natural Bodybuilding Federation Italian Championships. As a result, male and female bodybuilders ranked to the left in the BIVA ellipse relative to the general population. Furthermore, unlike females, males also ranked lower than the general athletic population. In addition, in the symmetry assessment, males show a significantly greater upper body than the lower, right, and left parts, while in women, this is observed for the lower part of the body. The differences in the results obtained between males and females can be attributed to the different patterns of endocrine production between the sexes and the different criteria used by the juries to attribute the final score during the competitions. Therefore, BIVA references in bodybuilders could help adjust the training and nutritional program during the peak week before a competition.

وصف الملف: ELETTRONICO

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000969667500001; volume:15; issue:7; firstpage:1606; numberofpages:11; journal:NUTRIENTS; https://hdl.handle.net/11564/802211Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85152320466; https://www.mdpi.com/2072-6643/15/7/1606Test

الإتاحة: https://doi.org/10.3390/nu15071606Test
https://hdl.handle.net/11564/802211Test
https://www.mdpi.com/2072-6643/15/7/1606Test

المؤلفون: Cannataro, Roberto, Cione, Erika, Cerullo, Giuseppe, Rondanelli, Mariangela, Micheletti, Piero, Crisafulli, Oscar, Micheli, Matteo Levi, D'Antona, Giuseppe

المصدر: Physiological Reports ; volume 11, issue 13 ; ISSN 2051-817X 2051-817X

الوصف: Type I diabetes has an incidence of 15 per 100,000 people. Though it is a metabolic disorder, it can be seen in top, even professional athletes. Physical activity is recommended to manage diabetes, but there is a lack of specific knowledge on diabetes management and exercise from dedicated medical staff. This bias leads to suboptimal diabetes management, causing frequent hyper and hypoglycemia, a dysregulation of glycated hemoglobin, blood glucose out of control, and consequent needs to often intervene with extra insulin or carbohydrates. For 5 years, we followed a highly competitive male Caucasian athlete Vovinam Viet Vo Dao, with type I diabetes, aged 17. We monitored his glycated hemoglobin, the insulin drug administered, and glycemia blood level averages. We obtained, over time, a decrease in glycated hemoglobin by almost −22% and insulin administered by −37.33%, and average blood glycemia levels diminished by almost −27%. In addition, we carried out bioimpedance analysis and stratigraphy on the abdomen. Federation trainers supervised all physical training; we recorded an improvement in the general condition, underlined in particular by an increase in phase angle (from bioimpedance) of +17%.

الإتاحة: https://doi.org/10.14814/phy2.15740Test

المؤلفون: Micheli, Matteo, Moore, Daniel, Bach, Vanessa, Finkbeiner, Matthias

مصطلحات موضوعية: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten, decarbonization, defossilization, life cycle assessment, aviation, synthetic kerosene, e-kerosene, sustainable aviation fuel, power to liquid, direct air capture, green hydrogen, renewable hydrogen

الوصف: Decarbonization of the aviation sector is crucial to reaching the global climate targets. We quantified the environmental impacts of Power-to-Liquid kerosene produced via Fischer-Tropsch Synthesis from electricity and carbon dioxide from air as one broadly discussed alternative liquid jet fuel. We applied a life-cycle assessment considering a well-to-wake boundary for five impact categories including climate change and two inventory indicators. Three different electricity production mixes and four different kerosene production pathways in Germany were analyzed, including two Direct Air Capture technologies, and compared to fossil jet fuel. The environmental impacts of Power-to-Liquid kerosene varied significantly across the production pathways. E.g., when electricity from wind power was used, the reduction in CO2-eq. compared to fossil jet fuel varied between 27.6–46.2% (with non-CO2 effects) and between 52.6–88.9% (without non-CO2 effects). The reduction potential regarding CO2-eq. of the layout using low-temperature electrolysis and high-temperature Direct Air Capture was lower compared to the high-temperature electrolysis and low-temperature Direct Air Capture. Overall, the layout causing the lowest environmental impacts uses high-temperature electrolysis, low-temperature Direct Air Capture and electricity from wind power. This paper showed that PtL-kerosene produced with renewable energy could play an important role in decarbonizing the aviation sector. ; TU Berlin, Open-Access-Mittel – 2022

وصف الملف: application/pdf; application/zip

العلاقة: https://depositonce.tu-berlin.de/handle/11303/17540Test; https://doi.org/10.14279/depositonce-16321Test

الإتاحة: https://doi.org/10.14279/depositonce-16321Test
https://depositonce.tu-berlin.de/handle/11303/17540Test

المؤلفون: Cannataro, Roberto, Morucci, Gabriele, Moni, Luca, Malorgio, Marta, Ryskalin, Larisa, Gesi, Marco, Levi-Micheli, Matteo, Cione, Erika

المصدر: Current Sports Medicine Reports (Lippincott Williams & Wilkins); Dec2023, Vol. 22 Issue 12, p410-413, 4p

مصطلحات موضوعية: GLUTEN allergenicity, CELIAC disease, GLUTEN-free diet, ATHLETIC ability, SWIMMERS, ESSENTIAL nutrients

مستخلص: This article explores the management of a breaststroke swimmer with celiac disease who follows a gluten-free diet. It emphasizes that there is no scientific evidence supporting the idea that a gluten-free diet improves athletic performance for those without celiac disease. The article also notes that gluten-free foods can be lacking in essential nutrients and high in fat. It highlights the importance of diagnosing and managing celiac disease and nonceliac gluten sensitivity through clinical methods and exclusion diets. The article includes a case study of a 21-year-old male swimmer who struggled to gain muscle mass despite following a gluten-free diet. It provides details about the athlete's blood analysis and nutritional plan. The study concludes that a personalized approach to diet and supplementation can enhance the quality of life and athletic performance for athletes with celiac disease. [Extracted from the article]

: Copyright of Current Sports Medicine Reports (Lippincott Williams & Wilkins) is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Campa, Francesco, Levi Micheli, Matteo, Pompignoli, Matilde, Cannataro, Roberto, Gulisano, Massimo, Toselli, Stefania, Greco, Gianpiero, Coratella, Giuseppe

المصدر: International Journal of Sports Physiology & Performance; Jan2022, Vol. 17 Issue 1, p58-66, 9p, 2 Diagrams, 1 Chart, 2 Graphs

مصطلحات موضوعية: STRETCH (Physiology), SOCCER, BODY composition, STATURE, WATER in the body, GRAPHIC arts, MENSTRUAL cycle, TIME, BODY fluids, EXERCISE physiology, BIOELECTRIC impedance, DESCRIPTIVE statistics, ATHLETIC ability, JUMPING, BODY mass index, OVULATION, DATA analysis software, SPRINTING, ADIPOSE tissues

مستخلص: Purpose: To examine whether menstrual cycle affects body composition and bioimpedance vector analysis (BIVA) patterns, jumping and sprinting ability, and flexibility in elite soccer players. Methods: A total of 20 elite female soccer players (age: 23.8 [3.4] y, height: 1.63 [0.04] m, body mass: 61.4 [5.9] kg, and body mass index: 22.5 [2.4] kg/m²) were monitored during the early follicular and ovulatory phase across 2 consecutive menstrual cycles. Bioimpedance analysis was performed using foot-to-hand technology, and total body water and fat mass were determined by specific equations developed for athletes. Bioelectrical resistance and reactance were adjusted according to the BIVA procedures and plotted as a vector within the resistance–reactance graph. In addition, countermovement jump, 20-m sprint, and sit and reach were assessed. Results: A time effect (P <.05) was found for body mass, total body water, bioelectrical resistance and reactance, and flexibility. Specifically, body mass increased (P =.021) along with a gain in total body water (P =.001) from the ovulatory to the early follicular phase, while it decreased from the early follicular to the ovulatory phase during the second menstrual cycle. The BIVA vector shortened during the early follicular phases (P <.001). No change in jumping and sprinting capacity was observed (P >.05). Flexibility was impaired during the early follicular phases (P <.05). Conclusions: Specific bioelectrical impedance analysis and BIVA procedures are able to detect menstrual cycle–induced changes in body composition in elite soccer players. The early follicular phase resulted in fluid accumulations and BIVA vector shortening. In addition, while menstrual cycle did not affect performance, a fluctuation in flexibility was observed. [ABSTRACT FROM AUTHOR]

: Copyright of International Journal of Sports Physiology & Performance is the property of Human Kinetics Publishers, Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Cebrián-Ponce, Álex, Petri, Cristian, Izzicupo, Pascal, Micheli, Matteo Levi, Cortis, Cristina, Fusco, Andrea, Carrasco-Marginet, Marta, Mascherini, Gabriele

المصدر: Sports (2075-4663); Aug2023, Vol. 11 Issue 8, p142, 9p

مصطلحات موضوعية: ELITE athletes, SPECIFIC gravity, BIOELECTRIC impedance, HUNTING, BODY fluids, HYDRATION

مستخلص: Background: Hydration status has a direct role in sports performance. Bioelectrical Impedance Vector Analysis (BIVA) and Urine Specific Gravity (USG) are commonly used to assess hydration. The study aims to identify the sensitivity and relationship between BIVA and USG in a field sports setting. Methods: BIVA and USG measurements were conducted five times throughout one rugby season. 34 elite male rugby players (25.1 ± 4.4 years; 184.0 ± 7.8 cm; 99.9 ± 13.4 kg) were enrolled. Differences over time were tested using one-way repeated measures ANOVA, and Bonferroni's post-hoc test was applied in pairwise comparisons. Resistance-reactance graphs and Hotelling's T2 test were used to characterize the sample and to identify bioelectrical changes. A repeated measures correlation test was conducted for BIVA-USG associations. Results: Two clear trends were seen: (1) from July to September, there was a vector shortening and an increase of the phase angle (p < 0.001); and (2) from December to April, there was a vector lengthening and a decrease of the phase angle (p < 0.001). USG reported neither changes nor correlation with BIVA longitudinally (p > 0.05). Vector variations indicated a body fluid gain (especially in the intracellular compartment) and a body cell mass increase during the preseason, suggesting a physical condition and performance improvement. During the last months of the season, the kinetic was the opposite (fluid loss and decreased body cell mass). Conclusions: Results suggested that BIVA is sensitive to physiological changes and a better option than USG for assessing hydration changes during a rugby sports season. [ABSTRACT FROM AUTHOR]

: Copyright of Sports (2075-4663) is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Bongiovanni, Tindaro, Rossi, Alessio, Genovesi, Federico, Martera, Giulia, Puleo, Giuseppe, Orlandi, Carmine, Spedicato, Mirco, Iaia, F. Marcello, Del Vescovo, Riccardo, Gallo, Stefano, Cannataro, Roberto, Ripari, Patrizio, Micheli, Matteo Levi, Cataldi, Stefania, Trecroci, Athos

المصدر: Journal of Functional Morphology & Kinesiology; Jun2023, Vol. 8 Issue 2, p80, 11p

مصطلحات موضوعية: BODY composition, BIOELECTRIC impedance, SOCCER, SOCCER players, DEFENSIVE players, FAT

مستخلص: The present study aimed to investigate how playing positions differ in specific body composition variables in professional soccer players with respect to specific field zones and tactical lines. Five hundred and six Serie A and B professional soccer players were included in the study and analyzed according to their playing positions: goalkeepers (GKs), central backs (CBs), fullbacks (FBs), central midfielders (MIDs), wide midfielders (WMs), attacking midfielders (AMs), second strikers (SSs), external strikers (ESs), and central forwards (CFs), as well as their field zones (central and external) and tactical lines (defensive, middle, and offensive). Anthropometrics (stature and body mass) of each player were recorded. Then, body composition was obtained by means of bioelectric impedance analysis (BIA). GKs and CFs were the tallest and heaviest players, with no differences from each other. Likewise, GKs and CFs, along with CBs, were apparently more muscular (for both upper and lower limbs) and fatter at the same time compared with the other roles. Overall, players of the defensive line (CBs and FBs), along with those playing in central field zones (CBs, MIDs, AMs, SSs, and CFs), were significantly (p < 0.05) superior in almost all anthropometric and body composition variables than those of middle and offensive line and external zones, respectively. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of Functional Morphology & Kinesiology is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Mascherini, Gabriele, Buglione, Niccolò, Ciani, Virginia, Tirinnanzi, Franco, Bini, Vittorio, Levi Micheli, Matteo

المصدر: Healthcare (2227-9032); Dec2022, Vol. 10 Issue 12, p2486, 8p

مصطلحات موضوعية: REFERENCE values, EXERCISE tests, STRETCH (Physiology), AEROBIC capacity, GRIP strength, RUNNING, MUSCLE contraction, AGE distribution, CROSS-sectional method, CARDIOPULMONARY fitness, PHYSICAL fitness, MANN Whitney U Test, ADOLESCENT health, SEX distribution, ARM, LEG, PHYSIOLOGICAL effects of acceleration, COMPARATIVE studies, MUSCLE strength, DESCRIPTIVE statistics, HAMSTRING muscle, JUMPING, DATA analysis software, HIGH school students, MOTOR ability, ADOLESCENCE

مصطلحات جغرافية: ITALY

مستخلص: Physical fitness during youth is linked to the health of today's young people and future adults. Therefore, fitness evaluation can direct any physical exercise interventions and verify improvements. The study aims to provide normative values of the physical fitness of the Florentine adolescent population. This cross-sectional study enrolled 1915 subjects aged 14 and 15 from the first and second high school classes. Tests were performed to assess cardiovascular endurance, upper and lower limb strength, running speed and agility, and lower limb muscle flexibility. Sex and age-related percentiles were elaborated. The study included 1028 subjects in the first class (aged 14.3 ± 0.8 years; 54.5% females) and 887 in the second class (aged 15.3 ± 0.7 years; 53.4% females). Males showed higher values than females except for flexibility. Furthermore, both genders show increased results in transitioning from the first to the second class, except for muscle flexibility and running speed. The percentiles of the present study provide normative values of the physical fitness of the 14–15-year-old Florentine adolescent population. These results, characterized by a sociocultural specificity linked to the territory from which they were collected, can contribute to the assessment and improvement of the physical status of young people, promoting current and future health. [ABSTRACT FROM AUTHOR]

: Copyright of Healthcare (2227-9032) is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)