Jordan Outlaw

Effects of ingestion of a commercially available thermogenic dietary supplement on resting energy expenditure, mood state and cardiovascular measures.

BackgroundIncreasing metabolism is a primary focus of many commercially available dietary supplements marketed to support weight management. Caffeine (e.g. anhydrous and herbal) and green tea are key ingredients in such products, augmenting resting energy expenditure (REE) and improving reported mood states (alertness, fatigue, focus, etc.). The purpose of this study was to evaluate the effects of a thermogenic dietary supplement (DBX) on REE, respiratory exchange ratio (RER), reported measures of alertness, focus, energy, concentration, fatigue, and hunger, as well as the general safety of the product based on electrocardiogram (ECG) and hemodynamic responses in habitual caffeine consumers.MethodsSix male and six female subjects (mean ± SD; 22.50 ± 3.22 years; 76.94 ± 14.78 kg; 22.7 ± 9.5% body fat), physically active (≥12 months), and moderate habitual caffeine consumers (<200 mg/day) received either two capsules of DBX containing 340 mg of total caffeine plus green tea extract, yerba mate extract, carnitine tartrate and other active ingredients or a placebo (PLC) in a double-blinded, crossover design. Heart rate (HR), blood pressure (BP), REE, RER and perceived mood states were measured at baseline and then hourly for four hours after ingesting either treatment.ResultsResting energy expenditure was significantly increased at all four time points and significant increases were determined for perceived alertness (p = 0.026) and focus (p = 0.05) at hour 1 and for energy at 1 and 2 hours after treatment for the DBX group (p = 0.008 and p = 0.017, respectively). Additionally, perceived fatigue was decreased at the hour 1 assessment (p = 0.010). No significant differences were seen between DBX and placebo for hunger, anxiety, HR, BP, ECG patterns or RER.ConclusionsThe results of this investigation support that the proprietary blend of this thermogenic aid is capable of increasing REE for four hours post-ingestion while supporting increased focus, alertness, and energy as well as decreasing fatigue without promoting anxiety or causing significant changes in HR, BP, or ECG measurements in habitual caffeine consumers.

Acute effects of a commercially-available pre-workout supplement on markers of training: a double-blind study.

BackgroundPre-workout supplements containing numerous ingredients claim to increase performance and strength. Product-specific research is important for identifying efficacy of combined ingredients. The purpose of this study was to evaluate the effects of a proprietary pre-workout dietary supplement containing creatine monohydrate, beta-alanine, L-Tarurine, L-Leucine, and caffeine, on anaerobic power, muscular strength, body composition, and mood states.MethodsIn a double-blind, randomized, matched-pair design, twenty male subjects (mean ± SD; 22.4 ± 9.5 yrs, 76.9 ± 11.2 kg, 22.7 ± 9.5% body fat), consumed either 30 g of a pre-workout supplement (SUP) or maltodextrin placebo (PLC) 30 minutes before a resistance training workout, after completing baseline testing. Body composition was determined via dual-energy x-ray absorptiometry (DEXA). Subjects completed 12 vertical jumps for height (VJ) and one repetition maximum (1RM) and repetitions to failure lifts on bench (BPM) and leg press (LPM). Finally, subjects completed a Wingate power test on a cycle ergometer [mean power (WMP) and peak power (WPP)]. After baseline testing, participants completed eight days of supplementation and four split-body resistance-training bouts. Side effect questionnaires were completed daily 30 minutes after consuming the supplement. Subjects completed post-supplement testing on Day 8. Data were analyzed utilizing a 2 × 2 repeated measures ANOVA [treatment (PLC vs SUP) × time (T1 vs T2)] and ninety-five percent confidence intervals.ResultsThere were no significant treatment × time interactions (p > 0.05). There were no significant changes in %body fat (%BF; ∆-0.43 ± 0.58; p = 0.920), fat mass (∆-2.45 ± 5.72; p = 0.988), or lean body mass (LBM; 10.9 ± 12.2; p = 0.848). 95% CI demonstrated significant LBM increases for both groups. There was a main effect for time for WPP (∆100.5 ± 42.7W; p = 0.001), BPM (∆8.0 ± 12.9 lbs; p = 0.001), and LPM (∆80.0 ± 28.8 lbs; p = 0.001), with no significant differences between treatments. There was no significant difference in mood states between groups or over time.ConclusionThe proprietary pre-workout blend combined with eight days of training did not significantly (ANOVA) improve body composition or performance. While not significant, greater gains in LPM were demonstrated in the SUP group for lean body mass and lower body strength. Future studies should evaluate more chronic effects of proprietary pre-workout blends on total training volume and performance outcomes.

Effects of β-alanine on body composition and performance measures in collegiate women

Abstract Outlaw, JJ, Smith-Ryan, AE, Buckley, AL, Urbina, SL, Hayward, S, Wingfield, HL, Campbell, B, Foster, C, Taylor, LW, and Wilborn, CD. Effects of &bgr;-alanine on body composition and performance measures in collegiate women. J Strength Cond Res 30(9): 2627–2637, 2016—The purpose of this study was to evaluate the effects of &bgr;-alanine (BA) supplementation and resistance training on body composition and performance. In a double-blind placebo-controlled design, 16 untrained collegiate females (mean ± SD: 21.0 ± 2.2 years; 64.8 ± 8.5 kg; 164.5 ± 7.0 cm; 30.1 ± 5.1 percent body fat [%BF]) completed 8 weeks of resistance training while consuming either 3.4 g BA or placebo (PL; 5 g maltodextrin) before training sessions. Training consisted of 4 days per week upper- and lower-body exercises. Lean body mass (LBM), fat mass (FM), and %BF were assessed using dual-energy x-ray absorptiometry. Maximal oxygen consumption (V[Combining Dot Above]O2max), aerobic time to exhaustion, Wingate peak power, bench press and leg press 1RM (BPmax; LPmax), and repetitions at 65% (BPreps; LPreps), vertical jump (VJ), and standing broad jump were assessed using standard National Strength and Conditioning Association guidelines. All measurements were taken at baseline (T1), 4 weeks (T2), and 8 weeks (T3). Repeated-measures analysis of variance and 95% confidence intervals were used to determine significance. Body composition (LBM, FM, and %BF) improved over time (p < 0.01) for both groups. Maximal strength and VJ increased significantly from baseline to T3 (p ⩽ 0.05). There was a significant interaction for LPreps (p = 0.040), with only BA group resulting in significantly greater LPreps (p = 0.041) at T2 and T3. Results from this study suggest that 8 weeks, 4 days per week progressive resistance training and BA supplementation may be effective for improving lower-body muscular endurance. &bgr;-alanine had no additive effects on body composition or maximal strength in collegiate women.

Effects of a weight loss supplement on body composition and markers of metabolism in overweight male and female adults

Background Various weight loss supplements are commercially available and are composed of a wide variety of ingredients. Combined with a low calorie diet, some dietary supplements could possibly lead to changes in metabolism and/ or suppression of appetite that could lead to improved body composition. The purpose of this study was to investigate the effects of ingesting a commercially available dietary supplement and its effects on body composition, resting energy expenditure (REE), hunger, and various blood markers in free-living, overweight individuals. Methods

A Pilot Study Examining the Effects of 8-Week Whey Protein versus Whey Protein Plus Creatine Supplementation on Body Composition and Performance Variables in Resistance-Trained Women

Aims: We performed a pilot study examining the effects of whey protein and creatine supplementation (PRO + CRE group) versus whey protein supplementation (PRO group) alone on body composition and performance variables in a limited number of resistance-trained women. Methods: Seventeen resistance-trained women (21 ± 3 years, 64.7 ± 8.2 kg, 23.5 kg/m2, 26.6 ± 4.8% body fat, >6 months of training) performed a 4-day per week split-body resistance training program for 8 weeks. Subjects ingested either 24 g PRO (n = 9) or 24 g whey plus 5 g creatine monohydrate (PRO + CRE, n = 8) following each exercise bout. At baseline (T1), 4 weeks (T2) and 8 weeks (T3), body composition was measured by dual X-ray absorptiometry (DXA), strength measures (leg press and bench press one repetition maximum) and lower-body power measures were determined. Results: DXA lean mass increased from T1 to T3 in both groups (PRO: +2.5 kg, p < 0.001; PRO + CRE: +2.5 kg, p < 0.001), although no differences between groups were observed. Compared to T1 values, performance measures similarly increased in both groups from T1 to T3 although, no between-group differences were observed. Conclusions: PRO + CRE did not enhance training adaptations compared to PRO, albeit studies employing longer-term interventions with larger sample sizes are needed in order to confirm or disprove our findings.

Acknowledgement to the Reviewers

Aguilera, Concepción Alcain, Francisco J. Alexy, Ute Almiron Roig, Eva Anderson Berry, Ann Apalasamy, Y.D. Asemi, Zatollah Backx, Evelien Badr, Gamal Ballmer, Peter Barbaresko, Janett Barres, Romain Baumgartner, Jeannine Bernabe-Garcia, Mariela Bertrand-Michel, Justine Ble-Castillo, Jorge L. Boehm, Volker Brazeau, Anne-Sophie Breij, Laura M. Breton, Irene Brighenti, Furio Brittenham, Gary Brouwer, Ingeborg Brouwer-Brolsma, Elske Bruno, Richard S. Burguete-Garcia, Ana I. Calder, Philip Campanile, Fabio Cesare Carlson, Susan E. Catena, Andrés Cepeda Lopez, Ana Carla Cercamondi, Colin Cheng, Guo Chourdakis, Michael Chu, Filmer Chuang, Shu-Chun Clifton, Peter Czech-Kowalska, Justyna Davies, Peter Decsi, Tamás de Hollander, Ellen de Luis, Daniel de Oliveira, Alessandro de Roos, Nicole Domienik-Karlowicz, J. Duarte, Cristiana

Contents Vol. 69, 2016

A. Astrup, Copenhagen A. Berg, Freiburg Z.A. Bhutta, Karachi S.C. Bischoff, Stuttgart F. Branca, Rome R. Brigelius-Flohé, Nuthetal P.C. Calder, Southampton S. Carlson, Kansas City, Mo. I. Cetin, Milan R.J. Deckelbaum, New York, N.Y. T. Decsi, Pécs C.J. Field, Edmonton, Alta. K. Godfrey, Southampton R. Hakkak, Little Rock, Ark. W.S. Harris, Sioux Falls, S.Dak. H. Hauner, Munich M. Hernández-Triana, Havana H. Heseker, Paderborn N. Hiki, Tokyo E. Hypponen, London Y. Kido, Kyoto W. Kimura, Yamagata J. Kopecky, Prague M. Krawinkel, Giessen M. Lamprecht, Graz W. Langhans, Zurich D. Li, Hangzhou J. Linseisen, Neuherberg O. Ljungqvist, Örebro Founded 1959 as ‘Nutritio et Dieta’ by E. Azerad, H. Kapp and J. Trémolières. Continued by A. Wretlind (1961–1969). Continued by N. Zöllner (1970–1990) as ‘Nutrition and Metabolism’ (1970–1980), since 1980 integrating ‘Annales de la Nutrition et de l’Alimentation’, continued as ‘Annals of Nutrition and Metabolism’. Continued by G. Wolfram (1991–1999), Continued by I. Elmadfa (2000–2010) Official Journal of

Safety and efficacy of a proprietary thermogenic and cutting agent on measures of muscular strength and endurance, body composition, fat metabolism, and hormone levels

Purpose The purpose of this study was to conduct a clinical trial on the commercially available thermogenic supplement (Iron Cuts) and its effects on various markers of performance, metabolism, body composition, and hormone levels. The supplement evaluated in this study contains several ingredients (caffeine, green tea extract, fenugreek, etc.) that have been shown to promote positive adaptations of some of the dependent variables of interest.

Comparison of serum fatty acid content and caloric expenditure after a single bout of moderate-intensity and high-intensity treadmill exercise in young females.

Background The idea behind high-intensity interval training (HIIT) is that an individual will burn a greater amount of calories and fat in a shorter period of time than moderate-intensity exercise. While beneficial changes have been seen when HIIT is incorporated into training programs, there is still information about HIIT that is unknown. At moderate intensities, triacylglycerol is the predominate fuel source based on percentage while carbohydrates are the predominate fuel during high-intensity exercise. Serum fatty acid (FFA) can be used as marker of fat utilization during and after exercise. The purpose of this investigation was to determine the amount of FFA released during moderateintensity and high-intensity treadmill running in endurance trained females.

Effects of intermittent fasting on markers of body composition and mood state

Background Optimal athletic performance is often linked to body composition, therefore depending on sport and position, a decrease in body fat would lean toward an increase in athletic fitness. A recent trend in decreasing body fat while maintaining muscle has emerged, called intermittent fasting. Some research has suggested that ingesting calories only in a certain time frame during the day (8 hour, 10hour window) would put the body into fat metabolism while avoiding muscle catabolism during the remaining fasting hours. The purpose of this study is to investigate the effects of intermittent fasting and resistance training on body composition, mood state, and resting energy expenditure.