Download or read book The Effect of Caffeine on Peak Torque and Muscle Endurance in the Knee Extensors and Flexors written by Mickey Dale Weber and published by . This book was released on 1990 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Warm up on Isokinetic Peak Torque of Knee Extensors and Flexors written by Carl Pelletier and published by . This book was released on 1992 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison of the Peak Torque Curves of the Knee Extensors and Flexors of College Females Involved in Two Strength training Programs written by Jane Kirkpatrick and published by . This book was released on 1988 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Caffeine and Ephedrine on Strength Power and Quickness written by Shawn R. Putnam and published by . This book was released on 2000 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The study was designed to assess the acute effects of placebo, caffeine, ephedrine, and the combination of caffeine and ephedrine on strength, power, and quickness. Using a repeated measures, double-blind design, 10 male subjects (21.90 + 1.73 years) performed maximal knee extension using the CYBEX NORM (Cybex International, Ronkonkoma, NY) as a measure of strength; power was measured by the height (cm) of a vertical jump; quickness was measured as the time taken to complete a 40 m maximal shuttle run. Subjects performed the exercise tests 75 min after ingestion of either placebo, caffeine (5 mg.kg-1), ephedrine (1 mg.kg-1), or caffeine + ephedrine. The mean peak torque scores and total work scores for the combination of caffeine and ephedrine condition were significantly (p .05) higher compared to the placebo condition. The average shuttle run means for the caffeine + ephedrine condition and the ephedrine condition were significantly (p
Download or read book Dietary Supplementation in Sport and Exercise written by Jay R Hoffman and published by Routledge. This book was released on 2019-06-07 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dietary Supplementation in Sport and Exercise removes the myths associated with many dietary supplements. It provides an evidence-based approach to the physiological mechanisms related to popular supplements and examines the ergogenic benefits in both competitive and recreational athletes. This text covers a variety of supplements, including vitamins and minerals, carbohydrates, protein and amino acids, beta-alanine, creatine and guanidinoacetic acid, caffeine and probiotics, as well as emerging ergogenic aids. Information on dosage, ceiling effects and washout periods is discussed, along with safety and legality for different sporting organizations. The book also offers an insight into the efficacy of certain dietary supplements in unique populations, like children and the elderly. Dietary Supplementation in Sport and Exercise is an important resource for advanced undergraduate and graduate students on exercise science, health and nutrition courses, as well as strength coaches, athletic trainers, nutritionists and personal trainers, and medical professionals who consult with patients on dietary supplementation.
Download or read book Drugs in Sport written by David R. Mottram and published by Routledge. This book was released on 2010-11-12 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drug use and abuse is perhaps the biggest challenge facing sport today. However, in the eye of the storm of public and press opinion and with medals and morals at stake, it can be difficult to gain a clear perspective on this complex issue. Drugs in Sport is the most comprehensive and accurate text available on the subject. Now in a fully revised and updated fifth edition, taking into account the latest regulations, methods and landmark cases, the book explores the hard science behind drug use in sport, as well as the ethical, social, political and administrative context. Key topics include: mode of action and side effects of each major class of drugs used in sport discussion of cutting-edge issues, including gene doping the latest doping control regulations of the World Anti-Doping Agency (WADA) methods and advances in doping control, including new intelligence-led detection policies the use of Therapeutic Use Exemption for certain drugs banned in sport issues surrounding non-prohibited substances and ergogenic aids an assessment of the prevalence of drug taking in sport. Accessibly written, extensively referenced, and supported throughout with illustrative case studies and data, Drugs in Sport provides a comprehensive, objective resource for students and researchers, athletes, sports scientists, coaches, journalists, sports administrators and policymakers.
Download or read book Coffee and Caffeine Consumption for Human Health written by Juan Del Coso and published by MDPI. This book was released on 2020-04-15 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The year 2019 has been prolific in terms of new evidence regarding the effects of coffee and caffeine consumption on diverse aspects of human functioning. This book collects 20 high-quality manuscripts published in Nutrients that include original investigation or systematic review studies of the effects of caffeine intake on human performance and health. The diversity of the articles published in this Special Issue highlights the extent of the effects of coffee and caffeine on human functioning, while underpinning the positive nature of most of these effects. This book will help with understanding why the natural sources of caffeine are so widely present in the nutrition behaviors of modern society.
Download or read book The Effect of Caffeine Dosages on Force Production of the Knee Extensor Muscles in Trained Male Cyclists Before and After a 40 kilometer Time Trial written by and published by . This book was released on 2010 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to compare the effects of a lower dosage of caffeine (3 mg/kg BW) to a higher dosage (6 mg/kg BW) on maximal voluntary contraction (MVC) and fatigue of the knee extensor muscles in 17 trained male cyclists (26.4 ± 7.2 years old). MVC and fatigue of the knee extensor muscles were measured via a fixed-position leg extension machine equipped to measure the peak force production of an isometric contraction of the knee extensors. Subjects completed four separate cycle ergometer time trials with no more than ten days, and no less than five days, separating any two trials. The first trial served as a familiarization trial. In the following three trials, subjects consumed either a placebo capsule, a 3 mg/kg BW caffeine capsule, or a 6 mg/kg BW caffeine capsule. The three treatments were administered in double-blind fashion. Each treatment capsule was taken along with 22 fluid ounces of a 6% carbohydrate/electrolyte sports drink one hour prior to beginning the time trial. All trials were performed during the morning following at least ten hours of fasting and at least 24 hours of caffeine abstinence. MVCs of the right leg quadriceps muscles of each subject were performed on a fixed-position leg extension machine just prior to the beginning of each time trial and two to three minutes following completion of each trial. There was no main effect for either treatment (p=0.309) for pre-40k MVCs (placebo, 390 ± 111 N; 3 mg/kg BW, 407 ± 111 N; 6 mg/kg BW, 404 ± 111 N) or between mean post-40k MVCs (placebo, 368 ± 101 N; 3 mg/kg BW, 376 ± 119 N; 6 mg/kg BW, 374 ± 106 N). There was, however, a significant (p=0.005) decline from the average pre-40k MVC to the average post-40k MVC. There was no statistically significant (p=0.595) condition*time effect on MVC. Caffeine consumption significantly (p=0.002) improved 40k times in both the 3 mg/kg BW trial (72.9 ± 4.6 min.) and the 6 mg/kg BW trial (71.9 ± 4.7 min.) over the placebo trial (74.5 ± 5.5 min.). Furthermore, though the difference was not significant (a-prior level set at p
Download or read book Drugs in Sport written by David Mottram and published by Taylor & Francis. This book was released on 2022-01-24 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drugs in Sport is the most comprehensive and accurate text on the emotive, complex and critical subject of performance enhancement and doping within sport. Thoroughly updated in light of the latest World Anti-Doping Code and taking into account the latest regulations, procedures and landmark cases, this 8th edition explores the science behind drug use in sport, as well as its ethical, social, political and administrative context. Introducing an increased focus on athletes with specific needs and on corrupt doping practices, the book covers key topics including: - an evaluation of the prevalence of doping in sport; - the latest doping control regulations stipulated by the World Anti-Doping Agency (WADA); - the science and side effects of each major class of drug used in sport; - cutting-edge issues such as drug use by transgender athletes; - medical and anti-doping considerations for athletes with an impairment; - governance and corruption in sport including institutionalised doping; - issues surrounding sport nutrition and supplement use in sport; - medical and pharmaceutical services at major sporting events. Accessibly written, and supported throughout with illustrative case studies and data, Drugs in Sport provides a crucial and objective resource for students and researchers, athletes, sports scientists, coaches and athlete-support staff, journalists, sports administrators and policymakers, alike.
Download or read book The Effect of an Energy Drink on Acute Muscle Strength and Fatigue in Young Males written by Michelle Hawley and published by . This book was released on 2012 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: The popularization of energy drink use as a supplement to exercise is steadily increasing, especially among young adult males. However, the effects of energy drinks on muscular performance in young adults have yet to be clearly elucidated. Eight male subjects (mean age: 23.3 ± 4.3 yrs, height: 181.0 ± 5.3 cm, fat percent 17.8 ± 5.2%, and weight 85.3 ± 12.6 kg) completed this randomized double-blinded cross over study. The purpose of this study was to determine differences in acute muscular strength and endurance and Profile of Mood States (POMS) scores between three treatments (RockStar, sugar-free RockStar, and sugar-free caffeine-free Placebo). It was hypothesized that there would be no significant differences in acute peak torque and endurance of the knee extensors and flexors or on fatigue and vigor subscores from the POMS questionnaire. Each man was tested randomly at least 1 week apart. Diet and time of day were held constant across trials. Peak torque of knee extensors and flexors at 60, 180, 240 degress/second and fatigue index and total work were calculated by performing 50 repetitions at 240 degrees/second. There were no significant differences in peak torque, fatigue index, or total work measures or in subjective measures of fatigue or vigor from the POMS between the treatments. This study indicates that RockStar energy drinks have no acute ergogenic effects in young men performing isokinetic strength or endurance testing.
Download or read book Effects of Caffeine on Lower Body Peak Torque and Power Output written by Michael J. Steidle and published by . This book was released on 2018 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The purpose of the present study was to examine the effects of various dosages of caffeine (3 mg/kg, 5 mg/kg, 7 mg/kg) on peak torque and power output in recreationally trained adults, ages 21-35 with a background in athletics. Subjects (N = 10) completed a total of five sessions; one for familiarization with the exercises, and the others for testing. At each session, subjects ingested either the placebo or one of the dosages of caffeine. After waiting an hour, the subjects completed three vertical jumps on the force plate to measure power in watts (W). Subjects also completed eccentric, isometric, and concentric leg extensions and leg curls using a Biodex to measure peak torque in newton meters (Nm) and power (W). A statistically significant (p > .05) difference was observed between caffeine dosages for concentric leg curl power output, eccentric leg curl power output, concentric leg extension peak torque, concentric leg curl peak torque, and isometric leg extension peak torque. Power output and peak torque increased significantly with these variables when subjects supplemented with 7mg/kg in comparison to the placebo.
Download or read book Impact of Caffeine on Strength and Endurance written by Ella Knight and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Caffeine is a well-established ergogenic aid believed to increase strength and muscular endurance. An increase in strength suggests a centralized impact, or an “outflow” effect, on the central nervous system (CNS). An increase in muscular endurance suggests an impact of caffeine on peripheral factors such as the myoneural junction or others that locally impact muscular contractions. The present study was conducted to determine the predominant impact of caffeine, either on central or peripheral factors that govern muscular contraction, or both. Data concluded that (1.) muscular strength increased from control in both the caffeine and placebo trials, and (2.) there was no improvement in muscular endurance in the caffeine and placebo trial when compared to control; however, during the isokinetic endurance test, there was a modest increase in peak torque in the caffeine trial when compared to control. This study was conducted with approval from the Hanover College Human Subjects Institutional Review Board.
Download or read book Effects of Creatine and Caffeine Supplementation During Resistance Training in Trained Young Adults written by Avery Ronald David Pakulak and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the study was to determine the separate and combined effects of creatine and caffeine supplementation during resistance training on body composition, muscle thickness and muscle performance (strength, endurance) in trained young adults. Twenty-eight participants were randomized to supplement with Creatine and Caffeine (CR-CAF; n = 9; 22 ± 4 yrs; 0.1 g·kg-1·d-1 of creatine monohydrate powder + 3 mg·kg-1·d-1 of caffeine anhydrous micronized powder); Creatine (CR; n = 7; 22 ± 4 yrs, 0.1 g·kg-1·d-1 of creatine + 3 mg·kg-1·d-1 of caffeine placebo [micronized cellulose powder]), Caffeine (CAF; n = 6; 19 ± 1 yrs, 3 mg·kg-1·d-1 of caffeine + 0.1 g·kg-1·d-1 of creatine monohydrate placebo [maltodextrin]) or placebo (PLA; n = 6; 23 ± 7 yrs, 0.1 g·kg-1·d-1 of creatine monohydrate placebo + 3 mg·kg-1·d-1 of caffeine placebo) one hour before performing resistance training for 6 weeks. Prior to and following training and supplementation, measurements were made for body composition (fat-free and fat mass by air-displacement plethysmography), muscle thickness (elbow and knee flexors and extensors by ultrasound), muscle strength (leg press and chest press by 1-repetition maximum [1-RM]) and muscle endurance (1 set of repetitions to volitional fatigue using 50% baseline 1-RM for leg press and chest press). There was a group x time interaction (p = 0.049) for knee extensor muscle thickness with the CR group experiencing an increase over time with no changes for the other groups. There were no other between group differences for any variable. In conclusion, 6 weeks of creatine and caffeine supplementation during resistance training has no effect in trained young adults.
Download or read book The Influence of Warm up on Peak Torque Production of Knee Flexor and Extensor Muscles written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acute Effects of Antagonist Stretching on Jump Height and Knee Extension Peak Torque written by John B. Sandberg and published by . This book was released on 2011 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: A great deal of research has shown decrements in force and power following static stretching. There has been little research investigating the acute effects of static stretching of the antagonist on the expression of strength and power. The purpose of this study was to investigate the effects of static stretching of the antagonist muscles on a variety of strength and power measures. Sixteen active males were tested for vertical jump height and isokinetic torque production in a slow knee extension (KES) at 60 [degrees]/s and a fast knee extension (KEF) at 300 [degrees]/s. Electromyography was taken during knee extension tests for the vastus lateralis and the biceps femoris muscles. Participants performed these tests in a randomized counterbalanced order with and without prior antagonist stretching. All variables for stretching and non-stretching treatments were compared using paired t tests at an alpha of .05. Paired samples t tests revealed a significant (p = .034) difference between stretch KEF and non-stretch KEF conditions. There was no significant (p> .05) difference between KES stretch and non-stretch conditions. Vertical jump height was significantly (p = .011) higher for the stretching treatment than the non-stretching treatment. Vertical jump power was also significantly higher (p = .005) in the stretch versus the non-stretch condition. Paired samples t test indicated no significant (p> .05) difference between testing conditions for electromyography, represented as a percentage of maximal voluntary contraction (MVC). These results suggest that stretching the antagonist hamstrings prior to high speed isokinetic knee extension increases torque production. It also demonstrated that stretching the hip flexors and dorsi flexors may enhance jump height and power. Practitioners may use this information to acutely enhance strength and power performances.
Download or read book The Effect of Caffeine on the Concentric and Eccentric Torque velocity Characteristics of the Elbow Flexors in High Strength and Low Strength College Age Males written by Eric Richard Blough and published by . This book was released on 1992 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Caffeine on Muscular Strength and Muscular Endurance written by Blake Robertson and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to determine the optimal time to take caffeine I order to maximize muscular strength and muscular endurance. There have been many studies done that have shown that caffeine has the ability to improve both muscular strength and endurance due to many different effects that it has in the central nervous system. However, there is still a very intriguing question: when is the optimal time to take caffeine in order to maximize performance? It is known that caffeine has its peak effects occur about 45 minutes after ingestion. By taking caffeine 45 minutes before exercise, the peak effects would occur at the beginning of the workout, and by taking it 15 minutes before the exercise, the peak effects would occur in the middle of the workout, when the body is becoming fatigue. This study is aimed to figure out which of these scenarios is the most effective.
