Kinesiology Commons^™

A Randomized Controlled Trial To Examine The Impact Of A Multi-Strain Probiotic On Self-Reported Indicators Of Depression, Anxiety, Mood, And Associated Biomarkers, Kylie E. Walden, Jessica M. Moon, Anthony M. Hagele, Leah E. Allen, Connor J. Gaige, Joesi M. Krieger, Ralf Jäger, Petey W. Mumford, Marco Pane, Chad M. Kerksick

Faculty Scholarship

Objective: To examine the efficacy of supplementing with a multi-strain probiotic (MSP) on changes associated with mood, anxiety, and neurotransmitter levels.

Method: In a randomized, double-blind, placebo-controlled fashion, 70 healthy men and women (31.0  ±  9.5  years, 173.0  ±  10.4  cm, 73.9  ±  13.8  kg, 24.6  ±  3.5  kg/m2 ) supplemented with a single capsule of MSP (a total daily dose of 4 × 109 colony forming units [CFU] comprised of a 1 × 109   CFU dose from each of the following strains: Limosilactobacillus fermentum LF16, Lacticaseibacillus rhamnosus LR06, Lactiplantibacillus plantarum LP01, and Bifidobacterium longum 04, Probiotical S.p.A., Novara, …

Sex Differences In Resting Metabolic Rate Among Athletes And Association With Body Composition Parameters: A Follow-Up Investigation, Andrew R. Jagim, Margaret T. Jones, Andrew T. Askow, Joel Luedke, Jacob L. Erickson, Jennifer B. Fields, Chad Kerksick

Faculty Scholarship

The purpose of this study was to examine sex differences in resting metabolic rate (RMR) and associations between measured RMR and body composition parameters in athletes. One-hundred and ninety collegiate men (n = 98; age: 20.1 ± 1.6 yr.; body mass: 92.7 ± 17.5 kg; height: 181.6 ± 6.2 cm, body mass index: 28.0 ± 4.7 kg/m2) and women (n = 92; age: 19.4 ± 1.1 yr.; body mass: 65.2 ± 11.0 kg; height: 168.0 ± 6.6 cm, body mass index: 23.0 ± 3.6 kg/m2) athletes volunteered to participate in this study. Athletes completed a body composition assessment using air …

Editorial: Pre-Workout Nutrition, Chad Kerksick, Jamie N. Pugh

Faculty Scholarship

Unavailable.

International Society Of Sports Nutrition Position Stand: Coffee And Sports Performance, Lonnie M. Lowery, Dawn E. Anderson, Kelsey F. Scanlon, Abigail Stack, Guillermo Escalante, Sara C. Campbell, Chad M. Kerksick, Michael T. Nelson, Tim N. Vandusseldorp, Douglas S. Kalman, Bill I. Campbell, Richard B. Kreider, Jose Antonio

Faculty Scholarship

Based on review and critical analysis of the literature regarding the contents and physiological effects of coffee related to physical and cognitive performance conducted by experts in the field and selected members of the International Society of Sports Nutrition (ISSN), the following conclusions represent the official Position of the Society:

(1) Coffee is a complex matrix of hundreds of compounds. These are consumed with broad variability based upon serving size, bean type (e.g. common Arabica vs. Robusta), and brew method (water temperature, roasting method, grind size, time, and equipment).

(2) Coffee’s constituents, including but not limited to caffeine, have neuromuscular, …

Effects Of Fucoidan Supplementation On Inflammatory And Immune Response After High-Intensity Exercise, Bridget A. Mcfadden, Caroline S. Vincenty, Alexa J. Chandler, Harry P. Cintineo, Blaine S. Lints, Gianna F. Mastrofini, Shawn M. Arent

Faculty Scholarship

Introduction: High-intensity exercise (HIE) can damage the musculotendon complex and impact the immune response, resulting in post-exercise inflammation. Sufficient rest and recovery will improve muscular resilience against future damaging bouts; however, HIE with minimal durations of rest is common in athletic competitions that facilitate persistent inflammation and immune dysregulation. Fucoidans are fucose-rich sulfated polysaccharides with demonstrated anti-inflammatory and pro-immune responses. Fucoidans may improve inflammation and immune responses, which may prove beneficial for individuals who regularly engage in repeated HIE. The research purpose was to investigate the safety and efficacy of fucoidans on inflammatory and immune markers following HIE.

Methods …

Evaluation Of Novel Beverage Formulations For Hydration Enhancement In Humans, Grant M. Tinsley, Madelin R. Siedler, Christian Rodriguez, Patrick Harty, Matthew T. Stratton, Sarah J. White, Dale S. Keith, Jacob J. Green, Jake R. Boykin, Abegale D. Williams, Brielle Dehaven, Alexandra Brojanac, Ethan Tinoco

Faculty Scholarship

This study evaluated the influence of novel beverage formulations on bioimpedance- and urine-based hydration markers. Thirty young healthy adults (n=16 females, n=14 males; age: 23.2±3.7 years; BMI: 24.3±3.3 kg/m2 ) participated in a randomized, double-blind, placebo-controlled, crossover study. Participants completed three conditions with baseline bioimpedance, urine, and body mass assessments, followed by ingestion of one liter of a test beverage over a 30-minute period. The three beverages were: active hydration formulation in still (AFstill) or sparkling (AFspark) water and a still water control. The active formulations were identical in concentrations of alpha-cyclodextrin and complexing agents. Following beverage ingestion, bioimpedance assessments …

A Cross-Sectional Examination Of Wrist Wrap Use Prevalence And Characterization For Ergogenic Purposes In Actively Competing Powerlifters, Dillon Harris, Thomas Cardaci, Harry Cintineo, Richard Pham, Kristen Dunsmore, Leslee Funderburk, Steven Machek

Faculty Scholarship

Purpose: Wrist wraps are regularly incorporated by competitive powerlifters, but several product-specific variations may influence any potential ergogenic benefits. In addition, the prevalence of athletic wrist wrap use is hitherto undescribed.

Methods: Seventy actively competing powerlifters (n=70; 27±6y) who competed in the last two years were randomly recruited at sanctioned meets, whereby wrist wrap use descriptive data (wrap style [F or S], wrap length, and events used), wrap tightness (assessed via pulse oximeter-detected oxygen saturation (SpO2) and subjective discomfort [Borg CR10+]), as well as post-meet bench press one repetition maximum (1RM) were collected. Wrist wrap use prevalence data (wrap …

Energy Expenditure And Availability In Active Individuals With Physical Disabilities, Scott Richmond, Amanda Bayer, Chad Kerksick, Heather Pennington, Petey Mumford, Annie Alameda

Faculty Scholarship

The purpose of this study was to evaluate the risk of low energy availability (LEA) in a population of active individuals with physical disabilities. Healthy, active males and females with a physical disability (n=13; Mean±SD; Age: 26.4±6.5 years; Height: 143.4±59.6 cm; Body mass: 57.5±27.3 kg; Fat-free mass: 41±20.8 kg;) were recruited to participate in this study. Participants were expected to track their exercise energy expenditure (EEE) and energy intake (EI) over the course of five days using portable wrist and chest-strap heart rate monitors. Body composition assessment completed via dual-energy x-ray absorptiometry (DXA) and resting energy expenditure (REE) performed via …

International Society Of Sports Nutrition Position Stand: Nutritional Concerns Of The Female Athlete, Stacy T. Sims, Chad M. Kerksick, Abbie E. Smith-Ryan, Xanne A.K. Janse De Jonge, Katie R. Hirsch, Shawn M. Arent, Susan Joyce Hewlings, Susan M. Kleiner, Erik Bustillo, Jaime L. Tartar, Valerie G. Starratt, Richard B. Kreider, Casey Greenwalt, Liliana I. Renteria, Michael J. Ormsbee, Trisha A. Vandusseldorp, Bill I. Campbell, Douglas S. Kalman, Jose Antonio

Faculty Scholarship

Based on a comprehensive review and critical analysis of the literature regarding the nutritional concerns of female athletes, conducted by experts in the field and selected members of the International Society of Sports Nutrition (ISSN), the following conclusions represent the official Position of the Society: 1. Female athletes have unique and unpredictable hormone profiles, which influence their physiology and nutritional needs across their lifespan. To understand how perturbations in these hormones affect the individual, we recommend that female athletes of reproductive age should track their hormonal status (natural, hormone driven) against training and recovery to determine their individual patterns and …

International Society Of Sports Nutrition Position Stand: Energy Drinks And Energy Shots, Andrew R. Jagim, Patrick S. Harty, Grant M. Tinsley, Chad M. Kerksick, Adam M. Gonzalez, Richard B. Kreider, Shawn M. Arent, Ralf Jager, Abbie E. Smith-Ryan, Jeffrey R. Stout, Bill I. Campbell, Trisha Vandusseldorp, Jose Antonio

Faculty Scholarship

Position Statement: The International Society of Sports Nutrition (ISSN) bases the following position stand on a critical analysis of the literature regarding the effects of energy drink (ED) or energy shot (ES) consumption on acute exercise performance, metabolism, and cognition, along with synergistic exercise-related performance outcomes and training adaptations. The following 13 points constitute the consensus of the Society and have been approved by the Research Committee of the Society: Energy drinks (ED) commonly contain caffeine, taurine, ginseng, guarana, carnitine, choline, B vitamins (vitamins B1, B2, B3, B5, B6, B9, and B12), vitamin C, vitamin A (beta carotene), vitamin D, …

Metabolic Impact Of Feeding Prior To A 60-Min Bout Of Moderate-Intensity Exercise In Females In A Fasted State, Kayla M. Ratliff, Chad M. Kerksick, Jessica M. Moon, Anthony M. Hagele, Johnathan L. Boring, Kylie Walden, Connor J. Gaige, Richard A. Stecker, Kyle L. Sunderland, Petey W. Mumford

Faculty Scholarship

Background: The metabolic impact of pre-exercise feeding of protein or carbohydrate on fat oxidation and energy expenditure rates, especially, in females, is poorly understood.

Methods: Recreationally active females (n = 15, 32 ± 10 years, 164.8 ± 5.6 cm, 63.5 ± 9.3 kg, 23.4 ± 3.2 kg/m2) completed four testing sessions in a randomized, double-blind, crossover fashion after fasting overnight. Participants ingested isovolumetric and isoenergetic solutions containing either 25 g of whey protein, casein protein, carbohydrate (CHO), or a non-caloric placebo (PLA). Participants then completed 60 min of treadmill exercise at 15% below ventilatory threshold 30 min after ingestion. …

Probiotic Bc30 Improves Amino Acid Absorption From Plant Protein Concentrate In Older Women, Kylie E. Walden, Anthony M. Hagele, Logan S. Orr, Kristen N. Gross, Joesi M. Krieger, Ralf Jäger, Chad M. Kerksick

Faculty Scholarship

Weizmannia coagulans GBI-30, 6086 (BC30) has previously been shown to increase protein digestion in an in vitro model of the stomach and small intestine and amino acid appearance in healthy men and women after ingestion of milk protein concentrate. The impact of ingesting BC30 with other protein sources or in other demographics is largely unknown. The purpose of this study was to examine the impact of adding BC30 to a 20-g dose of a blend of rice and pea protein on postprandial changes in blood amino acids concentrations in healthy, older women. Healthy, older females (n = 30, 58.5 …

Effects Of Creatine Monohydrate Timing On Resistance Training Adaptations And Body Composition After 8 Weeks In Male And Female Collegiate Athletes, Nicholas E. Dinan, Anthony Hagele, Andrew R. Jagim, Michael G. Miller, Chad M. Kerksick

Faculty Scholarship

Background: Limited research is available on the potential impact of creatine monohydrate administration before or after workouts among athletes. This study aimed to investigate the effects of pre- vs. post-exercise creatine monohydrate supplementation on resistance training adaptations and body composition.

Methods: In a randomized, double-blind, placebo-controlled, parallel design, 34 healthy resistance-trained male and female athletes were randomly assigned and matched according to fat free mass to consume a placebo, or 5-g dose of creatine monohydrate within 1 h before training, or within 1 h after training for 8 weeks, while completing a weekly resistance training program. Participants co-ingested 25-gram doses …

Lgd-4033 And Mk-677 Use Impacts Body Composition, Circulating Biomarkers, And Skeletal Muscle Androgenic Hormone And Receptor Content: A Case Report, Thomas D. Cardaci, Steven B. Machek, Dylan T. Wilburn, Jeffrey L. Heileson, Dillon R. Harris, Harry P. Cintineo, Darryn S. Willoughby

Faculty Scholarship

LGD-4033, a selective androgen receptor modulator, and MK-677, a growth hormone secretagogue, are becoming increasingly used amongst recreationally-active demographics. However, limited data exist describing their effects on health- and androgen-related biomarkers. The purpose of this case study is to report changes in body composition and biomarkers during and after continued co-administration of LGD-4033 and MK-677. We additionally aimed to examine muscular strength and intramuscular androgen-associated biomarkers relative to non-users. A 25-year-old male ingested LGD-4033 [10 mg] and MK-677 [15 mg] daily for 5 weeks. Blood and body composition metrics were obtained pre-, on-, and post-cycle. One repetition maximum (1RM) leg …

Effects Of End-Stage Osteoarthritis On Markers Of Skeletal Muscle Long Interspersed Element-1 Activity, Shelly C. Osburn, Matthew A. Romero, Paul A. Roberson, Petey W. Mumford, Derek A. Wiggins, Jeremy S. Mcadam, Devin J. Drummer, S. Louis Bridges Jr., Marcas M. Bamman, Michael D. Roberts

Faculty Scholarship

Objective: Long INterspersed Element-1 (L1) is an autonomous transposable element in the genome. L1 transcripts that are not reverse transcribed back into the genome can accumulate in the cytoplasm and activate an inflammatory response via the cyclic GMP-AMP (cGAS)-STING pathway. We examined skeletal muscle L1 markers as well as STING protein levels in 10 older individuals (63 ± 11 y, BMI= 30.2 ± 6.8 kg/m2) with end-stage osteoarthritis (OA) undergoing total hip (THA, n= 4) or knee (TKA, n= 6) arthroplasty versus 10 young, healthy comparators (Y, 22 ± 2 y, BMI= 23.2 ± 2.5 kg/m2). For OA, muscle …

Effects Of Standardized Hops (Humulus Lupulus L.) Extract On Joint Health: A Randomized, Placebo-Controlled, Double-Blind, Multiple Dose Study, Ralf Jäger, Brett Bernier, Jason Theodosakis, Gregory Bonfilio, Chad Kerksick, Martin Purpura

Faculty Scholarship

Background: This study’s aim was to evaluate the efficacy and safety of 14-days oral supplementation of a standardized hops extract containing 30% alpha acids, Humulus lupulus L. on individuals with osteoarthritis of the knee.

Methods: Thirty-three subjects (26 female, 7 male, 57.0 ± 6.9 years) participated in this randomized, double-blind, multi-dose study. Perceived pain (WOMAC), 20-meter walking performance and clinical safety markers (metabolic panel) was evaluated after 0 and 14 days of standardized hops extract (Perluxan®, 1 g/day [HOPS1G], n = 11 or 2 g/day [HOPS2G], n = 10 or placebo [PLA], n = 12). Changes in WOMAC …

International Society Of Sports Nutrition Position Stand: Tactical Athlete Nutrition, Drew E. Gonzalez, Matthew J. Mcallister, Hunter S. Waldman, Arny A. Ferrando, Jill Joyce, Nicholas D. Barringer, J. Jay Dawes, Adam J. Kieffer, Travis Harvey, Chad M. Kerksick, Jeffrey R. Stout, Tim N. Ziegenfuss, Annette Zapp, Jamie L. Tartar, Jeffrey L. Heileson, Trisha A. Vandusseldorp, Douglas S. Kalman, Bill I. Campbell, Jose Antonio, Richard B. Kreider

Faculty Scholarship

This position stand aims to provide an evidence-based summary of the energy and nutritional demands of tactical athletes to promote optimal health and performance while keeping in mind the unique challenges faced due to work schedules, job demands, and austere environments. After a critical analysis of the literature, the following nutritional guidelines represent the position of the International Society of Sports Nutrition (ISSN).

Effects Of High-Volume Versus High-Load Resistance Training On Skeletal Muscle Growth And Molecular Adaptations, Christopher G. Vann, Casey L. Sexton, Shelby C. Osburn, Morgan A. Smith, Cody T. Haun, Melissa N. Rumbley, Petey W. Mumford, Nathan T. Montgomery, Bradley A. Ruple, James Mckendry, Jonathan Mcleod, Adil Bashir, Ronald J. Beyers, Matthew S. Brook, Kenneth Smith, Philip J. Atherton, Darren T. Beck, James R. Mcdonald, Kaeilin C. Young, Stuart M. Phillips, Michael D. Roberts

Faculty Scholarship

We evaluated the effects of higher-load (HL) versus (lower-load) higher-volume (HV) resistance training on skeletal muscle hypertrophy, strength, and muscle-level molecular adaptations. Trained men (n = 15, age: 23 ± 3 years; training experience: 7 ± 3 years) performed unilateral lower-body training for 6 weeks (3× weekly), where single legs were randomly assigned to HV and HL paradigms. Vastus lateralis (VL) biopsies were obtained prior to study initiation (PRE) as well as 3 days (POST) and 10 days following the last training bout (POSTPR). Body composition and strength tests were performed at each testing session, and biochemical assays were …

Contributing Factors To Low Energy Availability In Female Athletes: A Narrative Review Of Energy Availability, Training Demands, Nutrition Barriers, Body Image, And Disordered Eating, Andrew R. Jagim, Jennifer Fields, Meghan K. Magee, Chad M. Kerksick, Margaret T. Jones

Faculty Scholarship

Relative Energy Deficiency in sport is experiencing remarkable popularity of late, particularly among female athletes. This condition is underpinned by low energy availability, which is a byproduct of high energy expenditure, inadequate energy intake, or a combination of the two. Several contributing factors exist that may predispose an athlete to low energy availability, and therefore a holistic and comprehensive assessment may be required to identify the root causes. The focus of the current narrative review is to discuss the primary contributing factors as well as known risk factors for low energy availability among female athletes to help practitioners increase awareness …

Prevalence And Amounts Of Common Ingredients Found In Energy Drinks And Shots, Andrew R. Jagim, Patrick S. Harty, Abdelrahman R. Barakat, Jacob L. Erickson, Victoria Carvalho, Chinguun Khurelbaatar, Clayton L. Camic, Chad M. Kerksick

Faculty Scholarship

Background: Energy drinks are one of the most popular packaged beverage products consumed within the United States (US). Energy drinks are considered a functional beverage, a category that also includes sports drinks and nutraceutical beverages. Purpose: The focus of the current study was to examine the nutrition fact panels of the top selling commercially available energy drink and energy shot products within the US to characterize common ingredient profiles to help establish a standard definition and ingredient profile of energy drinks and energy shots for consumers, health care practitioners, and researchers. Methods: The top 75 commercially available energy drinks and …

Absorption Kinetics Of Berberine And Dihydroberberine And Their Impact On Glycemia: A Randomized, Controlled, Crossover Pilot Trial, Jessica M. Moon, Kayla M. Ratliff, Anthony M. Hagele, Richard A. Stecker, Petey W. Mumford, Chad M. Kerksick

Faculty Scholarship

Berberine is a natural alkaloid used to improve glycemia but displays poor bioavailability and increased rates of gastrointestinal distress at higher doses. Recently, dihydroberberine has been developed to combat these challenges. This study was designed to determine the rate and extent to which berberine appeared in human plasma after oral ingestion of a 500 mg dose of berberine (B500) or 100 mg and 200 mg doses of dihydroberberine (D100 and D200). In a randomized, double-blind, crossover fashion, five males (26 ± 2.6 years; 184.2 ± 11.6 cm; 91.8 ± 10.1 kg; 17.1 ± 3.5% fat) completed a four-dose supplementation protocol …

Plant Proteins And Exercise: What Role Can Plant Proteins Have In Promoting Adaptations To Exercise?, Chad M. Kerksick, Andrew Jagim, Anthony Hagele, Ralf Jäger

Faculty Scholarship

Adequate dietary protein is important for many aspects of health with current evidence suggesting that exercising individuals need greater amounts of protein. When assessing protein quality, animal sources of protein routinely rank amongst the highest in quality, largely due to the higher levels of essential amino acids they possess in addition to exhibiting more favorable levels of digestibility and absorption patterns of the amino acids. In recent years, the inclusion of plant protein sources in the diet has grown and evidence continues to accumulate on the comparison of various plant protein sources and animal protein sources in their ability to …

Creatine For Exercise And Sports Performance, With Recovery Considerations For Healthy Populations, Benjamin Wax, Chad M. Kerksick, Andrew R. Jagim, Jerry J. Mayo, Brian C. Lyons, Richard B. Kreider

Faculty Scholarship

Creatine is one of the most studied and popular ergogenic aids for athletes and recreational weightlifters seeking to improve sport and exercise performance, augment exercise training adaptations, and mitigate recovery time. Studies consistently reveal that creatine supplementation exerts positive ergogenic effects on single and multiple bouts of short-duration, high-intensity exercise activities, in addition to potentiating exercise training adaptations. In this respect, supplementation consistently demonstrates the ability to enlarge the pool of intracellular creatine, leading to an amplification of the cell’s ability to resynthesize adenosine triphosphate. This intracellular expansion is associated with several performance outcomes, including increases in maximal strength (low-speed …

Health And Ergogenic Potential Of Oral Adenosine-5′-Triphosphate (Atp) Supplementation, Ralf Jäger, Martin Purpura, John A. Rathmacher, John C. Fuller Jr., Lisa M. Pitchford, Fabricio E. Ross, Chad M. Kerksick

Faculty Scholarship

Adenosine triphosphate (ATP) is the primary compound that provides energy to drive many processes in living cells, including muscle contraction, neurotransmission, and cardiac function. Initial research used enteric-coated ATP that displayed no apparent efficacy. However, ATP disodium supplementation has demonstrated improved bioavailability and acute and chronic benefits to cardiovascular health, muscular performance, body composition, and recovery while attenuating muscle breakdown and fatigue. In this review, we provide a critical assessment of oral ATP’s bioavailability and its various health and ergogenic benefits.

Physical And Metabolic Changes After Ileal Pouch-Anal Anastomosis: A Case Study, Jacob Erickson, Patrick Harty, Paul Molling, Richie Stecker, Chad Kerksick, Andrew Jagim

Faculty Scholarship

This case study examined changes in body composition, resting metabolic rate (RMR), aerobic capacity, and daily physical activity in a patient who had ulcerative colitis and underwent ileal pouch-anal anastomosis (IPAA) surgery. Body composition, RMR, and peak oxygen consumption (VO2peak) were assessed prior to surgery and four, eight, and 16 weeks after IPAA surgery. Daily physical activity data were extracted from a wrist-worn activity tracker preoperatively and 16 months postoperatively. At baseline, total body mass was 95.3 kg; body fat, 11.6%; lean body mass, 81.1 kg; RMR, 2416 kcal/d; and VO2peak, 42.7 mL/kg/min. All values decreased from baseline at four …

The Basics Of Training For Muscle Size And Strength: A Brief Review On The Theory, Samuel L. Buckner, Matthew B. Jessee, Grant J. Mouser, Scott J. Dankel, Kevin T. Mattocks, Zachary W. Bell, Takashi Abe, Jeremy P. Loenneke

Faculty Scholarship

The periodization of resistance exercise is often touted as the most effective strategy for optimizing muscle size and strength adaptations. This narrative persists despite a lack of experimental evidence to demonstrate its superiority. In addition, the general adaptation syndrome, which provides the theoretical framework underlying periodization, does not appear to provide a strong physiological rationale that periodization is necessary. Hans Selye conducted a series of rodent studies which used toxic stressors to facilitate the development of the general adaptation syndrome. To our knowledge, normal exercise in humans has never been shown to produce a general adaptation syndrome. We question whether …

Limb Occlusion Pressure: A Method To Assess Changes In Systolic Blood Pressure, Zachary W. Bell, Matthew B. Jessee, Kevin T. Mattocks, Samuel L. Buckner, Scott J. Dankel, J. Grant Mouser, Takashi Abe, Jeremy P. Loenneke

Faculty Scholarship

Although often used as a surrogate, comparisons between traditional blood pressure measurements and limb occlusion assessed via hand-held Doppler have yet to be completed. Using limb occlusion pressure as a method of assessing systolic pressure is of interest to those studying the acute effects of blood flow restriction, where the removal of the cuff may alter the physiological response. Purpose: We sought to determine how changes in limb occlusion pressure track with changes in traditional assessments of blood pressure. Basic Procedures: Limb occlusion pressure measured by hand-held Doppler and blood pressure measured by an automatic blood pressure cuff were assessed …

A Pilot Study To Examine The Impact Of Beta-Alanine Supplementation On Anaerobic Exercise Performance In Collegiate Rugby Athletes, Charles R. Smith, Patrick S. Harty, Richard A. Stecker, Chad M. Kerksick

Faculty Scholarship

Beta-alanine (BA) is a precursor to carnosine which functions as a buffer assisting in the maintenance of intracellular pH during high-intensity efforts. Rugby is a sport characterized by multiple intermittent periods of maximal or near maximal efforts with short periods of rest/active recovery. The purpose of this pilot study was to evaluate the impact of six weeks of beta-alanine supplementation on anaerobic performance measures in collegiate rugby players. Twenty-one male, collegiate rugby players were recruited, while fifteen completed post-testing (Mean ± SD; Age: 21.0 ± 1.8 years, Height: 179 ± 6.3 cm, Body Mass: 91.8 ± 13.3 kg, % Body …

Eight Weeks Of A High Dose Of Curcumin Supplementation May Attenuate Performance Decrements Following Muscle-Damaging Exercise, Ralf Jäger, Martin Purpura, Chad M. Kerksick

Faculty Scholarship

Background: It is known that unaccustomed exercise—especially when it has an eccentric component—causes muscle damage and subsequent performance decrements. Attenuating muscle damage may improve performance and recovery, allowing for improved training quality and adaptations. Therefore, the current study sought to examine the effect of two doses of curcumin supplementation on performance decrements following downhill running. Methods: Sixty-three physically active men and women (21 ± 2 y; 70.0 ± 13.7 kg; 169.3 ± 15.2 cm; 25.6 ± 14.3 body mass index (BMI), 32 women, 31 men) were randomly assigned to ingest 250 mg of CurcuWIN® (50 mg of curcuminoids), 1000 mg …

Eight Weeks Of A High Dose Of Curcumin Supplementation May Attenuate Performance Decrements Following Muscle-Damaging Exercise, Ralf Jäger, Martin Purpura, Chad Kerksick

Faculty Scholarship

Background: It is known that unaccustomed exercise—especially when it has an eccentric component—causes muscle damage and subsequent performance decrements. Attenuating muscle damage may improve performance and recovery, allowing for improved training quality and adaptations. Therefore, the current study sought to examine the effect of two doses of curcumin supplementation on performance decrements following downhill running. Methods: Sixty-three physically active men and women (21 ± 2 y; 70.0 ± 13.7 kg; 169.3 ± 15.2 cm; 25.6 ± 14.3 body mass index (BMI), 32 women, 31 men) were randomly assigned to ingest 250 mg of CurcuWIN® (50 mg of curcuminoids), 1000 mg …