Search results for: Jeffrey M. Anderson

Items from 1 to 13 out of 13 results

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Metabolic characteristics of keto-adapted ultra-endurance runners

Jeff S. Volek, Daniel J. Freidenreich, Catherine Saenz, Laura J. Kunces, more

Metabolism > 2016 > 65 > 3 > 100-110

Many successful ultra-endurance athletes have switched from a high-carbohydrate to a low-carbohydrate diet, but they have not previously been studied to determine the extent of metabolic adaptations.Twenty elite ultra-marathoners and ironman distance triathletes performed a maximal graded exercise test and a 180min submaximal run at 64% VO₂max on a treadmill to determine metabolic responses. One group...

article

Betaine supplementation enhances anabolic endocrine and Akt signaling in response to acute bouts of exercise

Jenna M. Apicella, Elaine C. Lee, Brooke L. Bailey, Catherine Saenz, more

European Journal of Applied Physiology > 2013 > 113 > 3 > 793-802

Our aim was to examine the effect of betaine supplementation on selected circulating hormonal measures and Akt muscle signaling proteins after an acute exercise session. Twelve trained men (age 19.7 ± 1.23 years) underwent 2 weeks of supplementation with either betaine (B) (1.25 g BID) or placebo (P). Following a 2-week washout period, subjects underwent supplementation with the other treatment (B...

article

Sex differences in creatine kinase after acute heavy resistance exercise on circulating granulocyte estradiol receptors

Megan R. Wolf, Maren S. Fragala, Jeff S. Volek, Craig R. Denegar, more

European Journal of Applied Physiology > 2012 > 112 > 9 > 3335-3340

Previous research has shown reduced tissue disruption and inflammatory responses in women as compared to men following acute strenuous exercise. While the mechanism of this action is not known, estrogen may reduce the inflammatory response through its interaction with granulocytes. The purpose of this study was to determine if estrogen receptor β expression on granulocytes is related to sex differences...

article

Caffeine lowers muscle pain during exercise in hot but not cool environments

Matthew S. Ganio, Evan C. Johnson, Rebecca M. Lopez, Rebecca L. Stearns, more

Physiology & Behavior > 2011 > 102 > 3-4 > 429-435

Caffeine (CAF) ingestion may enhance endurance exercise by lowering perceived exertion (RPE) and muscle pain. However, exercise in the heat may be detrimental to performance by increasing RPE and pain. The purpose of this study was to examine if caffeine affects pain and related perceptual responses differently in cool and hot ambient conditions. Eleven male cyclists (mean±SD; age, 25±6years; mass,...

article

Effect of ambient temperature on caffeine ergogenicity during endurance exercise

Matthew S. Ganio, Evan C. Johnson, Jennifer F. Klau, Jeffrey M. Anderson, more

European Journal of Applied Physiology > 2011 > 111 > 6 > 1135-1146

It is well established that caffeine ingestion during exercise enhances endurance performance. Conversely, the physiological and psychological strain that accompanies increased ambient temperature decreases endurance performance. Little is known about the interaction between environmental temperature and the effects of caffeine on performance. The purpose of this study was to compare the effects of...

article

Effect of resistance exercise on muscle steroid receptor protein content in strength-trained men and women

Jakob L. Vingren, William J. Kraemer, Disa L. Hatfield, Jeff S. Volek, more

Steroids > 2009 > 74 > 13-14 > 1033-1039

The purpose of this study was to examine the acute effect of resistance exercise (RE) on muscle androgen receptor (AR) and glucocorticoid receptor (GR) protein content. Fifteen resistance-trained men (n=8; 21±1 years, 175.3±6.7cm, 90.8±11.6kg) and women (n=7; 24±5 years, 164.6±6.7cm, 76.4±15.6kg) completed 6 sets of 10 repetitions of heavy squats. Blood samples were obtained before RE, after 3 and...

article

Elevated endogenous testosterone concentrations potentiate muscle androgen receptor responses to resistance exercise

Barry A. Spiering, William J. Kraemer, Jakob L. Vingren, Nicholas A. Ratamess, more

Journal of Steroid Biochemistry and Molecular Biology > 2009 > 114 > 3-5 > 195-199

The purpose of this study was to determine the influence of endogenous circulating testosterone (T) on muscle androgen receptor (AR) responses to acute resistance exercise (RE). Six healthy men (26±4 years; 176±5cm; 75.8±11.4kg) performed a knee extension exercise protocol on two occasions separated by 1–3 weeks. Rest preceded one trial (i.e., control [CON] trial) and a high-volume upper-body RE protocol...

article

Influences of a dietary supplement in combination with an exercise and diet regimen on adipocytokines and adiposity in women who are overweight

Maren S. Fragala, William J. Kraemer, Jeff S. Volek, Carl M. Maresh, more

European Journal of Applied Physiology > 2009 > 105 > 5 > 665-672

The influence of a proprietary blend of modified cellulose and cetylated fatty acids (Trisynex™, Imagenetix, Inc., San Diego, CA 92127, USA) on adipocytokine and regional body composition responses to a weight loss program was examined. Twenty-two women (Supplement group (S) (n = 11): age = 36.8 ± 7.2 years; weight = 87.1 ± 6.2 kg; % body fat = 43.4 ± 4.1; Placebo group (P) (n = 11): age = 38.3 ± 6...

article

Effects of Carnitine Supplementation on Flow-Mediated Dilation and Vascular Inflammatory Responses to a High-Fat Meal in Healthy Young Adults

Jeff S. Volek, Daniel A. Judelson, Ricardo Silvestre, Linda M. Yamamoto, more

The American Journal of Cardiology > 2008 > 102 > 10 > 1413-1417

Because carnitine has been shown to decrease oxidative stress and improve endothelial cell functioning, we examined the effects of carnitine supplementation on postprandial flow-mediated dilation (FMD) and circulating biomarkers of inflammation and oxidative stress after a high-fat meal. A randomized, double-blind, placebo-controlled, crossover study design was used. Thirty men and women (age 30 ±...

article

Effects of a multi-nutrient supplement on exercise performance and hormonal responses to resistance exercise

William J. Kraemer, Disa L. Hatfield, Barry A. Spiering, Jakob L. Vingren, more

European Journal of Applied Physiology > 2007 > 101 > 5 > 637-646

The purpose of this study was to determine the influence of a comprehensive multi-component nutritional supplement on performance, hormonal, and metabolic responses to an acute bout of resistance exercise. Nine healthy subjects ingested either Muscle Fuel™ (MF) or a matched placebo (PL) for 7 days. Subjects then reported to the laboratory, ingested the corresponding supplement, and performed two consecutive...

article

Cognitive and motor function after administration of hydrocodone bitartrate plus ibuprofen, ibuprofen alone, or placebo in healthy subjects with exercise-induced muscle damage: a randomized, repeated-dose, placebo-controlled study

George J. Allen, Tamara L. Hartl, Shannon Duffany, Stefanie F. Smith, more

Psychopharmacology > 2003 > 166 > 3 > 228-233

Rationale. Medications combining hydrocodone bitartrate and non-steroidal anti-inflammatory agents appear more beneficial than anti-inflammatory medications alone in treating pain and inflammation from acute soft tissue trauma, but opiate side effects may include sedation and impaired cognitive and motor performance. Objective. Performance on complex cognitive and motor tasks was evaluated in healthy...

article

Development and validation of a screening tool to identify eating disorders in female athletes

KIMBERLY Y McNULTY, CYNTHIA H ADAMS, JEFFREY M ANDERSON, SANDRA G AFFENITO

Journal of the American Dietetic Association > 2001 > 101 > 8 > 886-892

Objective To develop and validate a screening tool to identify eating pathology in women athletes.Design Three cross-sectional subject groups were established: college women athletes diagnosed with eating disorders; college women athletes without eating pathology; college women who did not participate in athletics but were diagnosed with an eating disorder. The Female Athlete Screening Tool (FAST),...

article

Brief Report: Macrographia in High-Functioning Adults with Autism Spectrum Disorder

David Q. Beversdorf, Jeffrey M. Anderson, Susan E. Manning, Sheri L. Anderson, more

Journal of Autism and Developmental Disorders > 2001 > 31 > 1 > 97-101

The initial description of Asperger syndrome commented on the poor handwriting and motor coordination difficulties of individuals with this condition. Early descriptions of autism do not remark upon such difficulties. Recent evidence, however, suggests that individuals with both conditions have a similar motor control impairment. Handwriting has not been formally assessed in this context. Our study...

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