A Systematic Review of CrossFit® Workouts and Dietary and Supplementation Interventions to Guide Nutritional Strategies and Future Research in CrossFit®

2020 ◽  
pp. 1-19
Author(s):  
Ricardo Augusto Silva de Souza ◽  
André Guedes da Silva ◽  
Magda Ferreira de Souza ◽  
Liliana Kataryne Ferreira Souza ◽  
Hamilton Roschel ◽  
...  
Keyword(s):  
Systematic Review ◽  
Muscle Fatigue ◽  
High Intensity ◽  
Scientific Evidence ◽  
Metabolic Stress ◽  
Optimal Recovery ◽  
Future Research ◽  
Nutritional Recommendations ◽  
And Performance ◽  
Nutritional Strategies

CrossFit® is a high-intensity functional training method consisting of daily workouts called “workouts of the day.” No nutritional recommendations exist for CrossFit® that are supported by scientific evidence regarding the energetic demands of this type of activity or dietary and supplement interventions. This systematic review performed in accordance with PRISMA guidelines aimed to identify studies that determined (a) the physiological and metabolic demands of CrossFit® and (b) the effects of nutritional strategies on CrossFit® performance to guide nutritional recommendations for optimal recovery, adaptations, and performance for CrossFit® athletes and direct future research in this emerging area. Three databases were searched for studies that investigated physiological responses to CrossFit® and dietary or supplementation interventions on CrossFit® performance. Various physiological measures revealed the intense nature of all CrossFit® workouts of the day, reflected in substantial muscle fatigue and damage. Dietary and supplementation studies provided an unclear insight into effective strategies to improve performance and enhance adaptations and recovery due to methodological shortcomings across studies. This systematic review showed that CrossFit® is a high-intensity sport with fairly homogenous anaerobic and aerobic characteristics, resulting in substantial metabolic stress, leading to metabolite accumulation (e.g., lactate and hydrogen ions) and increased markers of muscle damage and muscle fatigue. Limited interventional data exist on dietary and supplementation strategies to optimize CrossFit® performance, and most are moderate to very low quality with some critical methodological limitations, precluding solid conclusions on their efficacy. High-quality work is needed to confirm the ideal dietary and supplemental strategies for optimal performance and recovery for CrossFit® athletes and is an exciting avenue for further research.

scholarly journals Portuguese Football Federation consensus statement 2020: nutrition and performance in football

2021 ◽  
Vol 7 (3) ◽  
pp. e001082
Author(s):  
Rodrigo Abreu ◽  
Pedro Figueiredo ◽  
Paulo Beckert ◽  
José P Marques ◽  
Samuel Amorim ◽  
...  
Keyword(s):  
Sports Medicine ◽  
Scientific Evidence ◽  
Soccer Players ◽  
Football Players ◽  
Sports Science ◽  
Physiological Demands ◽  
And Performance ◽  
Nutritional Strategies ◽  
Practical Constraints ◽  
Practical Recommendations

Nutrition is an undeniable part of promoting health and performance among football (soccer) players. Nevertheless, nutritional strategies adopted in elite football can vary significantly depending on culture, habit and practical constraints and might not always be supported by scientific evidence. Therefore, a group of 28 Portuguese experts on sports nutrition, sports science and sports medicine sought to discuss current practices in the elite football landscape and review the existing evidence on nutritional strategies to be applied when supporting football players. Starting from understanding football’s physical and physiological demands, five different moments were identified: preparing to play, match-day, recovery after matches, between matches and during injury or rehabilitation periods. When applicable, specificities of nutritional support to young athletes and female players were also addressed. The result is a set of practical recommendations that gathered consensus among involved experts, highlighting carbohydrates periodisation, hydration and conscious use of dietary supplements.

scholarly journals Supplements and Nutritional Interventions to Augment High-Intensity Interval Training Physiological and Performance Adaptations—A Narrative Review

Nutrients ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 390 ◽  
Author(s):  
Scott C. Forbes ◽  
Darren G. Candow ◽  
Abbie E. Smith-Ryan ◽  
Katie R. Hirsch ◽  
Michael D. Roberts ◽  
...  
Keyword(s):  
Sex Differences ◽  
Sodium Bicarbonate ◽  
High Intensity ◽  
Interval Training ◽  
Narrative Review ◽  
High Intensity Interval Training ◽  
Beta Alanine ◽  
And Performance ◽  
High Intensity Interval ◽  
Nutritional Strategies

High-intensity interval training (HIIT) involves short bursts of intense activity interspersed by periods of low-intensity exercise or rest. HIIT is a viable alternative to traditional continuous moderate-intensity endurance training to enhance maximal oxygen uptake and endurance performance. Combining nutritional strategies with HIIT may result in more favorable outcomes. The purpose of this narrative review is to highlight key dietary interventions that may augment adaptations to HIIT, including creatine monohydrate, caffeine, nitrate, sodium bicarbonate, beta-alanine, protein, and essential amino acids, as well as manipulating carbohydrate availability. Nutrient timing and potential sex differences are also discussed. Overall, sodium bicarbonate and nitrates show promise for enhancing HIIT adaptations and performance. Beta-alanine has the potential to increase training volume and intensity and improve HIIT adaptations. Caffeine and creatine have potential benefits, however, longer-term studies are lacking. Presently, there is a lack of evidence supporting high protein diets to augment HIIT. Low carbohydrate training enhances the upregulation of mitochondrial enzymes, however, there does not seem to be a performance advantage, and a periodized approach may be warranted. Lastly, potential sex differences suggest the need for future research to examine sex-specific nutritional strategies in response to HIIT.

scholarly journals Nutritional Support of the Critically Ill Pediatric Patient: Foundations and Controversies

2017 ◽  
Vol 8 ◽  
pp. 117956031770110 ◽  
Author(s):  
Iván José Ardila Gómez ◽  
Carolina Bonilla González ◽  
Paula Andrea Martínez Palacio ◽  
Elida Teresa Mercado Santis ◽  
José Daniel Tibaduiza Bayona ◽  
...  
Keyword(s):  
Critical Illness ◽  
Critically Ill ◽  
Nutritional Support ◽  
Metabolic Stress ◽  
Pediatric Intensive Care ◽  
Critically Ill Children ◽  
The Past ◽  
Nutritional Recommendations ◽  
Response To Stress ◽  
Nutritional Strategies

Critically ill children require nutritional support that will give them nutritional and non-nutritional support to successfully deal with their disease. In the past few years, we have been able to better understand the pathophysiology of critical illness, which has made possible the establishment of nutritional strategies resulting in an improved nutritional status, thus optimizing the pediatric intensive care unit (PICU) stay and decreasing morbidity and mortality. Critical illness is associated with significant metabolic stress. It is crucial to understand the physiological response to stress to create nutritional recommendations for critically ill pediatric patients in the PICU.

scholarly journals A systematic review on business analytics

2020 ◽  
Vol 13 (2) ◽  
pp. 283
Author(s):  
Jiarui Yin ◽  
Vicenc Fernandez
Keyword(s):  
Systematic Review ◽  
Business Performance ◽  
Relevant Literature ◽  
Recent Decade ◽  
Machine Learning Techniques ◽  
Future Research ◽  
Business Analytics ◽  
And Performance ◽  
Definition Of ◽  
Industry Sectors

Purpose: Business analytics, a buzzword of the recent decade, has been applied by thousands of enterprises to help generate more values and enhance their business performance. However, many aspects of business analytics remain unclear. This study clarifies the definition of business analytics combined with its functionality and the relation between business analytics and business intelligence. Moreover, we illustrate the applications of business analytics in both business areas and industry sectors and shed light on the education in business analytics. Ultimately, to facilitate future research, we summarize several research techniques used in the literature reviewed.Design/methodology/approach: We set well-established selection criteria to select relevant literature from two widely recognized databases: Scopus and Web of Science. Afterward, we reviewed the literature and coded relevant sections in an inductive way using MAXQDA. Then we compared and synthesized the coded information.Findings: There are mainly four findings. Firstly, according to the bibliometric analysis, literature about business analytics is growing exponentially. Secondly, business analytics is a system that enabled by machine learning techniques aiming at promoting the efficiency and performance of an organization by supporting the decision-making process. Thirdly, the application of business analytics is comprehensive, not only in specific areas of a company but also in different industry sectors. Finally, business analytics is interdisciplinary, and the successful training should involve technical, analytical, and business skills.Originality/value: This systematic review, as a synthesis of the current research on business analytics, can serve as a quick guide for new researchers and practitioners in the field, while experienced scholars can also benefit from this work, taking it as a practical reference.

scholarly journals Towards the best kidney failure prediction tool: a systematic review and selection aid

2019 ◽  
Vol 35 (9) ◽  
pp. 1527-1538 ◽  
Author(s):  
Chava L Ramspek ◽  
Ype de Jong ◽  
Friedo W Dekker ◽  
Merel van Diepen
Keyword(s):  
Systematic Review ◽  
Kidney Failure ◽  
External Validation ◽  
Model Development ◽  
Risk Of Bias ◽  
Future Research ◽  
Prediction Tool ◽  
Clinical Value ◽  
Wide Range ◽  
And Performance

Abstract Background Prediction tools that identify chronic kidney disease (CKD) patients at a high risk of developing kidney failure have the potential for great clinical value, but limited uptake. The aim of the current study is to systematically review all available models predicting kidney failure in CKD patients, organize empirical evidence on their validity and ultimately provide guidance in the interpretation and uptake of these tools. Methods PubMed and EMBASE were searched for relevant articles. Titles, abstracts and full-text articles were sequentially screened for inclusion by two independent researchers. Data on study design, model development and performance were extracted. The risk of bias and clinical usefulness were assessed and combined in order to provide recommendations on which models to use. Results Of 2183 screened studies, a total of 42 studies were included in the current review. Most studies showed high discriminatory capacity and the included predictors had large overlap. Overall, the risk of bias was high. Slightly less than half the studies (48%) presented enough detail for the use of their prediction tool in practice and few models were externally validated. Conclusions The current systematic review may be used as a tool to select the most appropriate and robust prognostic model for various settings. Although some models showed great potential, many lacked clinical relevance due to being developed in a prevalent patient population with a wide range of disease severity. Future research efforts should focus on external validation and impact assessment in clinically relevant patient populations.

scholarly journals Systemic constellations applied in organisations: a systematic review

2021 ◽  
Author(s):  
Salome Scholtens ◽  
Carla Petroll ◽  
Carlos Rivas ◽  
Joke Fleer ◽  
Barna Konkolÿ Thege
Keyword(s):  
Systematic Review ◽  
Empirical Evidence ◽  
Scientific Evidence ◽  
Grey Literature ◽  
Future Research ◽  
Team Coaching ◽  
Effectiveness Studies ◽  
Multiple Languages ◽  
Transformation Processes

AbstractThis article—published in the Journal Gruppe. Interaktion. Organisation.— presents a systematic overview of the current empirical evidence of the effectiveness of the systemic constellation method when applied in organisations.Although the systemic constellation method is increasingly used for team coaching, organisational development and transformation processes, among others, scientific evidence on the effectiveness and quality of this method is still scarce. This may hamper the broader implementation of a potentially useful approach. Altogether, ten electronic databases were searched up to January, 2020. Multiple languages, qualitative and quantitative designs, and academic and grey literature were included. The search resulted in the identification of 79 potentially relevant publications, seven of which were prospective and 13 were retrospective effectiveness studies in terms of organisational outcomes. Only two of the seven prospective studies used a controlled design. This review concludes that the empirical evidence on the systemic organisational constellation method points toward a potentially effective intervention in the organisational context. However, it is too early to make firm conclusions as the number of studies was small and quality of the studies was low in general.The present systematic review summarises the literature on the systemic constellation method applied in organisations. It offers coaches and consultants insights into the method from a scientific perspective and describes potential mechanisms of action regarding the intervention. The results of the review provide a solid basis for future research and give directions for new studies to support quality improvement and help us better understand the factors influencing effectiveness.

Locomotor muscle fatigue increases cardiorespiratory responses and reduces performance during intense cycling exercise independently from metabolic stress

2008 ◽  
Vol 294 (3) ◽  
pp. R874-R883 ◽  
Author(s):  
Samuele M. Marcora ◽  
Andrea Bosio ◽  
Helma M. de Morree
Keyword(s):  
Muscle Fatigue ◽  
Exercise Performance ◽  
High Intensity ◽  
Perceived Exertion ◽  
Metabolic Stress ◽  
Motor Command ◽  
Time To Exhaustion ◽  
Test Duration ◽  
Cardiorespiratory Responses ◽  
Locomotor Muscles

Locomotor muscle fatigue, defined as an exercise-induced reduction in maximal voluntary force, occurs during prolonged exercise, but its effects on cardiorespiratory responses and exercise performance are unknown. In this investigation, a significant reduction in locomotor muscle force (−18%, P < 0.05) was isolated from the metabolic stress usually associated with fatiguing exercise using a 100-drop-jumps protocol consisting of one jump every 20 s from a 40-cm-high platform. The effect of this treatment on time to exhaustion during high-intensity constant-power cycling was measured in study 1 ( n = 10). In study 2 ( n = 14), test duration (871 ± 280 s) was matched between fatigue and control condition (rest). In study 1, locomotor muscle fatigue caused a significant curtailment in time to exhaustion (636 ± 278 s) compared with control (750 ± 281 s) ( P = 0.003) and increased cardiac output. Breathing frequency was significantly higher in the fatigue condition in both studies despite similar oxygen consumption and blood lactate accumulation. In study 2, high-intensity cycling did not induce further fatigue to eccentrically-fatigued locomotor muscles. In both studies, there was a significant increase in heart rate in the fatigue condition, and perceived exertion was significantly increased in study 2 compared with control. These results suggest that locomotor muscle fatigue has a significant influence on cardiorespiratory responses and exercise performance during high-intensity cycling independently from metabolic stress. These effects seem to be mediated by the increased central motor command and perception of effort required to exercise with weaker locomotor muscles.

scholarly journals Evaluating the Evidence for More Frequent Than Annual HIV Screening of Gay, Bisexual, and Other Men Who Have Sex With Men in the United States: Results From a Systematic Review and CDC Expert Consultation

2017 ◽  
Vol 133 (1) ◽  
pp. 3-21 ◽  
Author(s):  
Elizabeth A. DiNenno ◽  
Joseph Prejean ◽  
Kevin P. Delaney ◽  
Kristina Bowles ◽  
Tricia Martin ◽  
...  
Keyword(s):  
Systematic Review ◽  
Scientific Evidence ◽  
Cost Effective ◽  
The United States ◽  
Future Research ◽  
Hiv Screening ◽  
Sexually Active ◽  
Current Recommendation ◽  
Annual Screening ◽  
Sex With Men

The Centers for Disease Control and Prevention (CDC) recommended in 2006 that sexually active gay, bisexual, and other men who have sex with men (MSM) be screened for human immunodeficiency virus (HIV) at least annually. A workgroup comprising CDC and external experts conducted a systematic review of the literature, including benefits, harms, acceptability, and feasibility of annual versus more frequent screening among MSM, to determine whether evidence was sufficient to change the current recommendation. Four consultations with managers of public and nonprofit HIV testing programs, clinics, and mathematical modeling experts were conducted to provide input on the programmatic and scientific evidence. Mathematical models predicted that more frequent than annual screening of MSM could prevent some new HIV infections and would be more cost-effective than annual screening, but this evidence was considered insufficient due to study design. Evidence supports CDC’s current recommendation that sexually active MSM be screened at least annually. However, some MSM might benefit from more frequent screening. Future research should evaluate which MSM subpopulations would benefit most from more frequent HIV screening.

scholarly journals Quality and Safety Indicators in Anesthesia

2009 ◽  
Vol 110 (5) ◽  
pp. 1158-1175 ◽  
Author(s):  
Guy Haller ◽  
Johannes Stoelwinder ◽  
Paul S. Myles ◽  
John McNeil
Keyword(s):  
Systematic Review ◽  
Scientific Evidence ◽  
Professional Organizations ◽  
Anesthesia Care ◽  
Quality And Safety ◽  
Quality Initiatives ◽  
Clinical Indicators ◽  
Governmental Agencies ◽  
And Performance ◽  
Development And Validation

Clinical indicators are increasingly developed and promoted by professional organizations, governmental agencies, and quality initiatives as measures of quality and performance. To clarify the number, characteristics, and validity of indicators available for anesthesia care, the authors performed a systematic review. They identified 108 anesthetic clinical indicators, of which 53 related also to surgical or postoperative ward care. Most were process (42%) or outcome (57%) measures assessing the safety and effectiveness of patient care. To identify possible quality issues, most clinical indicators were used as part of interhospital comparison or professional peer-review processes. For 60% of the clinical indicators identified, validity relied on expert opinion. The level of scientific evidence on which prescriptive indicators ("how things should be done") were based was high (1a-1b) for 38% and low (4-5) for 62% of indicators. Additional efforts should be placed into the development and validation of anesthesia-specific quality indicators.

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