Article
Psychology, Multidisciplinary
Helena Hartmann, Magdalena Banwinkler, Federica Riva, Claus Lamm
Summary: This study investigated potential psychological and structural brain differences between placebo responders and non-responders in the domain of pain. The results showed significant group differences in trait characteristics, with responders reporting increased helping behavior and lower psychopathic traits compared to non-responders. Uncorrected results also showed higher pain-related empathic concern in responders. These results suggest that modifiability of one's pain perception by placebo effects is linked to personality traits characterizing social emotions and behavior.
FRONTIERS IN PSYCHOLOGY
(2023)
Article
Nutrition & Dietetics
Josh W. Newbury, S. Andy Sparks, Matthew Cole, Adam L. Kelly, Lewis A. Gough
Summary: The purpose of this study was to investigate the use of nutritional supplements among highly trained swimmers on a national talent pathway. The study found that 98% of swimmers reported using at least one supplement, with performance and recovery being the main reasons. National swimmers used more supplements, particularly ergogenic aids, compared to age-group and development swimmers. Parents/guardians were the main source of supplement information for development swimmers, while performance nutritionists played a significant role for age-group and national swimmers. The study suggests the need for supplement education for parents/guardians at the development level and further research on the efficacy of supplements used by national swimmers.
Article
Food Science & Technology
Antonio Jesus Sanchez-Oliver, Raul Dominguez, Paola Lopez-Tapia, Francisco Miguel Tobal, Pablo Jodra, Juan Jose Montoya, Eduardo J. Guerra-Hernandez, Juan Jose Ramos-Alvarez
Summary: The study found that the majority of rugby players consume dietary supplements, with the main purpose being to enhance sports performance. Professional players tend to purchase them online and consume them during training and competition, while amateur players tend to consume them before competitions.
Article
Nutrition & Dietetics
Elif Gunalan, Betul Yildirim Cavak, Saadet Turhan, Irem Kaya Cebioglu, Raul Dominguez, Antonio Jesus Sanchez-Oliver
Summary: This study aimed to evaluate the consumption of dietary supplements in Turkish football players and found that male and professional players had a higher intake of supplements compared to females and non-professionals. The most consumed supplements included sports drinks, magnesium, vitamin C, and vitamin D.
Article
Nutrition & Dietetics
Berta Moreno, Santiago Veiga, Antonio J. Sanchez-Oliver, Raul Dominguez, Esther Morencos
Summary: Sports supplements are commonly used by competitive swimmers, regardless of gender and performance level. The consumption of medical supplements is higher among high-level swimmers.
Article
Business, Finance
Michael S. Pagano, John Sedunov, Raisa Velthuis
Summary: Individual investors at Robinhood are actively involved in both momentum and contrarian trading strategies, adjusting their strategies based on market conditions such as during the initial phase of the COVID-19 pandemic in March 2020. The impact of Robinhood investors on market quality varies depending on market conditions, with better market quality during less-stressful periods and worse market quality during the early weeks of the pandemic in the U.S.
FINANCE RESEARCH LETTERS
(2021)
Article
Orthopedics
Simran Kaur, Ole Kristian Alhaug, Filip C. Dolatowski, Tore K. Solberg, Greger Lonne
Summary: This cohort study analyzed and compared patients who failed to respond with those that responded to the Norwegian Registry for Spine Surgery (NORspine). The results showed that 30% of patients did not respond to NORspine at 12 months after surgery, but there were no significant differences in patient-reported outcome measures between non-respondents and respondents. This suggests that attrition bias in NORspine may be random and related to non-modifiable factors.
BMC MUSCULOSKELETAL DISORDERS
(2023)
Article
Nutrition & Dietetics
Neil D. Clarke, Darren L. Richardson
Summary: This study investigated the influence of habitual caffeine intake on the ergogenic effects of caffeine ingestion through coffee prior to a 5-km cycling time trial. The results showed that habitual caffeine consumption did not affect the performance enhancement from ingesting caffeinated coffee, with both low and high users experiencing similar improvements in the cycling time trial.
INTERNATIONAL JOURNAL OF SPORT NUTRITION AND EXERCISE METABOLISM
(2021)
Article
Business, Finance
Ross Levine, Chen Lin, Mingzhu Tai, Wensi Xie
Summary: During the pandemic, banks experienced massive deposit inflows, with deposit interest rates in counties with higher COVID-19 infection rates falling more than in counties with lower infection rates. Evidence suggests that higher local COVID-19 infection rates are associated with households' greater anxiety about future job and income losses, leading to reduced spending and increased deposits.
REVIEW OF FINANCIAL STUDIES
(2021)
Article
Nutrition & Dietetics
Ryan A. Tamilio, Neil D. Clarke, Michael J. Duncan, Rhys Morris, Jozo Grgic, Jason Tallis
Summary: This study found that acute caffeine consumption improved muscle strength performance in the elbow and knee joints even with chronic caffeine intake. Resistance training intervention resulted in significant improvements in upper and lower body strength, with similar effects between the caffeine and placebo groups.
Article
Sport Sciences
Philip Hurst, Christopher Ring, Maria Kavussanu
Summary: The study shows that there is an indirect relationship between sport supplement use and doping behavior, and this relationship is moderated by personal moral values. Athletes with lower moral values and less importance placed on being a moral person in their self-image are more likely to engage in doping behavior.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Sport Sciences
Jason Tallis, Neil Clarke, Rhys Morris, Darren Richardson, Matthew Ellis, Emma Eyre, Michael Duncan, Mark Noon
Summary: The study evaluated the use of caffeine in elite English soccer clubs, finding that most clubs provided caffeine to players to enhance performance, but there was a wide range and lack of consistency in timing, dosage, and mode of administration.
Article
Business, Finance
Wajahat Azmi, Zaheer Anwer, Shujaat Naeem Azmi, Haitham Nobanee
Summary: We used event study approach to examine the impact of Silicon Valley Bank failure on 11 major global assets. The results indicate that, except for Gold and US Treasury Bills, there was no significant response from other asset classes on the event day. Gold was considered a safe haven by investors during the event. Investors sold off US Treasury Bills due to uncertainty surrounding the Federal Reserve's monetary policy stance following the bank's failure. We also estimated Net Total Directional Connectedness using a TVP-VAR model, and the results were consistent with our previous findings. Overall, there was little evidence of reputation contagion or spillover to other asset classes.
FINANCE RESEARCH LETTERS
(2023)
Article
Nutrition & Dietetics
Josh W. Newbury, Bryan Saunders, Lewis A. Gough
Summary: This study investigated the effects of evening caffeine ingestion on sleep, side effects, and next-day performance in trained adolescent swimmers. The results showed no significant differences in swimming performance, subjective side effects, or sleep parameters between caffeine and placebo groups.
INTERNATIONAL JOURNAL OF SPORT NUTRITION AND EXERCISE METABOLISM
(2022)
Article
Nutrition & Dietetics
Katharina Wirnitzer, Mohamad Motevalli, Derrick R. Tanous, Martina Gregori, Gerold Wirnitzer, Claus Leitzmann, Thomas Rosemann, Beat Knechtle
Summary: Female and male distance runners have been found to have differences in physiological and psychological characteristics related to endurance, but gender was not found to be a strong modulator of supplement intake among different groups of endurance runners.
Review
Nutrition & Dietetics
Jozo Grgic
Summary: This review investigated the acute effects of sodium bicarbonate on Wingate test performance and found that sodium bicarbonate had an ergogenic effect on mean power in repeated Wingate tests, while its impact on peak power was limited.
JOURNAL OF THE AMERICAN NUTRITION ASSOCIATION
(2022)
Review
Hospitality, Leisure, Sport & Tourism
Jozo Grgic, Brad J. Schoenfeld, John Orazem, Filip Sabol
Summary: Training to muscle failure or non-failure does not have a significant impact on muscular strength and hypertrophy, except in studies where training volume is not equated between the groups, favoring non-failure training for strength gains. In resistance-trained individuals, training to failure has a significant effect on muscle hypertrophy.
JOURNAL OF SPORT AND HEALTH SCIENCE
(2022)
Review
Nutrition & Dietetics
Jozo Grgic, Pavle Mikulic
Summary: The meta-analysis revealed that sodium bicarbonate supplementation can significantly improve performance in 200-m and 400-m swimming events. Although the ergogenic effects were small, they may have substantial practical importance due to the narrow margins that often determine placings in swimming competitions.
JOURNAL OF DIETARY SUPPLEMENTS
(2022)
Review
Sport Sciences
Jozo Grgic
Summary: This meta-analysis found that the use of CWI following resistance exercise sessions attenuates muscular strength gains in males. However, when CWI was applied to the whole body, there was no significant difference in muscular strength gains between CWI and control.
EUROPEAN JOURNAL OF SPORT SCIENCE
(2023)
Article
Sport Sciences
Jozo Grgic
Summary: In recent studies, the effects of paracetamol on exercise performance have been explored, but due to conflicting findings, there is still no consensus on this topic. Paracetamol ingestion may enhance endurance performance and improve sprinting and resistance exercise performance. However, the use of paracetamol as an ergogenic aid needs to consider side effects and ethical concerns.
Article
Environmental Sciences
Jozo Grgic, Pavle Mikulic
Summary: This review conducted a meta-analysis to examine the effects of attentional focus on muscular endurance. The results indicated that an external focus of attention improved muscular endurance compared to an internal focus and control. The findings have important practical implications for enhancing muscular endurance through training.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Nutrition & Dietetics
Jozo Grgic
Summary: This review conducted a meta-analysis of multiple studies and found that caffeine supplementation can enhance isometric handgrip strength, particularly at small or moderate-to-high doses, in liquid or capsule form. However, these ergogenic effects were very small and were mainly observed among male participants.
CLINICAL NUTRITION ESPEN
(2022)
Review
Food Science & Technology
Javier Diaz-Lara, Jozo Grgic, Daniele Detanico, Javier Botella, Sergio L. Jimenez, Juan Del Coso
Summary: The interest in the benefits of caffeine in combat sports has increased significantly. A systematic review and meta-analysis of 25 studies show that caffeine ingestion improves vertical jump height, reaction time, number of throws in a special judo fitness test, and offensive actions during combat. Caffeine ingestion also increases blood lactate concentration after bouts. Overall, supplementing with caffeine can enhance exercise performance in combat sports.
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
(2022)
Review
Nutrition & Dietetics
Jozo Grgic
Summary: This review study found that caffeine has an ergogenic effect on resistance exercise performance even at low doses, and the magnitude of the effects is similar to that of higher doses. These findings indicate that the minimum effective dose of caffeine for enhancing performance is lower than previously suggested, and such doses can be obtained through a regular diet.
Letter
Sport Sciences
Jozo Grgic
Article
Food Science & Technology
J. Grgic
Summary: This meta-analysis explores the effects of low doses of caffeine (<3 mg/kg) on jumping performance and finds that it can enhance jump height. The effects are similar to higher caffeine doses and low doses of caffeine have minimal side effects.
NUTRITION & FOOD SCIENCE
(2023)
Review
Food Science & Technology
J. Grgic
Summary: This paper examines the effects of caffeine on swimming performance through a meta-analysis. The results show that caffeine ingestion has an ergogenic effect on swimming performance, especially in short-distance and moderate-to-long distance events. These findings are significant for competitive swimming outcomes.
NUTRITION & FOOD SCIENCE
(2022)
Review
Sport Sciences
Jozo Grgic
Summary: This paper conducted a review of studies on the reliability of the EUROFIT test battery. Six excellent quality studies were included in the review, and the findings suggest that the EUROFIT can be used as a reliable battery of tests to assess physical fitness. However, more research in different populations and exploration of variables that may impact reliability are needed.
SPORT SCIENCES FOR HEALTH
(2023)
Review
Sport Sciences
Muhammed M. Atakan, Yasemin Guzel, Nipun Shrestha, Sukran N. Kosar, Jozo Grgic, Todd A. Astorino, Huseyin H. Turnagol, Zeljko Pedisic
Summary: High-intensity interval training (HIIT) and sprint interval training (SIT) have a significant effect on fat oxidation during exercise. The effects are greater than moderate-intensity continuous training (MICT). The effects are more pronounced with longer training regimens and in individuals with overweight/obesity.
BRITISH JOURNAL OF SPORTS MEDICINE
(2022)
Review
Neurosciences
Carlos Alix-Fages, Jozo Grgic, Pablo Jimenez-Martinez, Eneko Baz-Valle, Carlos Balsalobre-Fernandez
Summary: The aim of this systematic review and meta-analysis was to examine the impact of mental fatigue on upper and lower body strength endurance. The researchers searched for relevant studies in PubMed/MEDLINE and Web of Science databases, and included studies that compared the effects of a demanding cognitive task on strength endurance in dynamic resistance exercise. The pooled analysis of the included studies revealed that mental fatigue significantly decreased the number of performed repetitions in both upper and lower body exercises. The findings suggest that exposure to cognitive tasks inducing mental fatigue should be limited before strength endurance-based resistance exercise sessions.
