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Identification Of High Responders For Interleukin-6 And Creatine Kinase Following Acute Eccentric Resistance Exercise In Elderly Obese Women, Vitor Tajra, Ramires Alsamir Tibana, Denis Cesar Leite Vieira, Darlan Lopes De Farias, Tatiane Gomes Teixeira, Silvana Schwerz Funghetto, Alessandro Oliviera Silva, Nuno Manuel Frade De Sousa, Jeffrey Willardson, Margo Gomes Oliviera Karnikowski, Jonato Prestes Nov 2014

Identification Of High Responders For Interleukin-6 And Creatine Kinase Following Acute Eccentric Resistance Exercise In Elderly Obese Women, Vitor Tajra, Ramires Alsamir Tibana, Denis Cesar Leite Vieira, Darlan Lopes De Farias, Tatiane Gomes Teixeira, Silvana Schwerz Funghetto, Alessandro Oliviera Silva, Nuno Manuel Frade De Sousa, Jeffrey Willardson, Margo Gomes Oliviera Karnikowski, Jonato Prestes

Jeffrey Willardson

Resistance exercise is used as a non-pharmacological tool to elicit both gains in and maintenance of physical function in the elderly. Thus, the present study examined the acute response of creatine kinase and interleukin-6 following an eccentric resistance exercise session in elderly obese women classified as high responders or normal responders.


Effects Of Rest Interval Length On Smith Machine Bench Press Performance And Perceived Exertion In Trained Men, Ramires A. Tibana, Denis C. Vieira, Vitor Tajra, Martim Bottaro, Belmiro F. De Salles, Jeffrey Willardson, Jonato Prestes Dec 2013

Effects Of Rest Interval Length On Smith Machine Bench Press Performance And Perceived Exertion In Trained Men, Ramires A. Tibana, Denis C. Vieira, Vitor Tajra, Martim Bottaro, Belmiro F. De Salles, Jeffrey Willardson, Jonato Prestes

Jeffrey Willardson

This study compared two different rest intervals (RI) between sets of resistance exercise. Ten resistance-trained men (M age = 24.3, SD = 3.5 yr.; M weigh t= 80.0 kg, SD = 15.3; M height = 1.75 m, SD = 0.04) performed five sets of Smith machine bench presses at 60% of one repetition maximum, either with 1.5 min. or 3 min. RI between sets. Their repetition performance, total training volume, velocity, fatigue, rating of perceived exertion, and muscular power were measured. All of these measures indicated that performance was significantly better and fatigue was significantly lower in the ...


Influence Of Exercise Order On Upper Body Maximum And Submaximal Strength Gains In Trained Men, Claudio O. Assumpcao, Ramires A. Tibana, Luan C. Viana, Jeffrey Willardson, Jonato Prestes Sep 2013

Influence Of Exercise Order On Upper Body Maximum And Submaximal Strength Gains In Trained Men, Claudio O. Assumpcao, Ramires A. Tibana, Luan C. Viana, Jeffrey Willardson, Jonato Prestes

Jeffrey Willardson

The purpose of this study was to investigate the influence of exercise order on one-repetition maximum (1-RM) and ten-repetition maximum (10-RM) strength gains after 6 weeks of resistance training (RT) in trained men. Sixteen men were randomly assigned into two groups based on the order of exercises performed during training sessions: a group that performed large muscle group exercises first and progressed to small muscle group exercises (LG-SM); while a second group performed the opposite sequence and started with small muscle group exercises and progressed to large muscle group exercises (SM-LG). Four sessions of RT were conducted per week; all ...


Supra-Physiological Doses Of Testosterone Affect Membrane Oxidation Of Human Neutrophils Monitored By The Fluorescent Probe C11-Bodipy581/591, Tacito Pessoa De Souza Jr, Andre K. Yamada, Roberto Simao, Tatiana G. Polotow, Rui Curi, Zachary Pope, Jeffrey Willardson, Marcelo P. Barros May 2013

Supra-Physiological Doses Of Testosterone Affect Membrane Oxidation Of Human Neutrophils Monitored By The Fluorescent Probe C11-Bodipy581/591, Tacito Pessoa De Souza Jr, Andre K. Yamada, Roberto Simao, Tatiana G. Polotow, Rui Curi, Zachary Pope, Jeffrey Willardson, Marcelo P. Barros

Jeffrey Willardson

The purpose of this study was to determine the effects of supra-physiological doses of testosterone (TES) on membrane oxidation of activated human neutrophils in vitro using an innovative and sensitive technique: the real-time detection with the fluorescence probe C11-BODIPY581/591. Methodological controls were performed with the lipid-soluble and powerful antioxidant astaxanthin at different neutrophil density cultures. Neutrophils from nine healthy young men (23.4 ± 2.5 years, 174.4 ± 7.0 cm height, and 78.3 ± 7.0 kg weight) were isolated and treated with 0.1 or 10 μM TES for 24 h and subsequently labeled with the free ...


Influence Of Upper-Body Exercise Order On Hormonal Responses In Trained Men, Roberto Simao, Richard Diego Leite, Guilherme Fleury Fina Speretta, Alex Souto Maior, Belmiro Freitas De Salles, Tacito Pessoa De Souza Jr, Jakob L. Vingren, Jeffrey Willardson Feb 2013

Influence Of Upper-Body Exercise Order On Hormonal Responses In Trained Men, Roberto Simao, Richard Diego Leite, Guilherme Fleury Fina Speretta, Alex Souto Maior, Belmiro Freitas De Salles, Tacito Pessoa De Souza Jr, Jakob L. Vingren, Jeffrey Willardson

Jeffrey Willardson

The aim of this study was to examine acute hormonal responses after different sequences of an upper-body resistance-exercise session. Twenty men completed 2 sessions (3 sets; 70% 1-repetition maximum; 2 min passive rest between sets) of the same exercises in opposite sequences (larger to smaller vs. smaller to larger muscle-group exercises). Total testosterone (TT), free testosterone (FT), testosterone/cortisol (T/C) ratio, sex-hormone-binding globulin (SHBG), growth hormone (GH), and cortisol (C) concentrations were measured before and immediately after each sequence. The results indicate that the GH concentration increased after both sessions, but the increase was significantly greater (p < 0.05) after the sequence in which larger muscle-group exercises were performed prior to the smaller muscle-group exercises. No differences were observed between sessions for TT, FT, SHBG, C, or the T/C ratio at baseline or immediately after resistance exercise. These results indicate that performing larger muscle-group exercises first in an upper-body resistance-exercise session leads to a significantly greater GH response. This may have been due to the significantly greater exercise volume accomplished. In summary, the findings of this investigation support the common prescriptive recommendation to perform larger-muscle group exercises first during a resistance-exercise session.


Effectiveness Of Exercise On Cognitive Impairment And Alzheimer’S Disease, Sandor Balsamo, Jeffrey Willardson, Frederico Santos De Santana, Jonato Prestes, Denise Coscrato Balsamo, Dahan Da Cunha Nascimento, Leopoldo Dos Santos-Neto, Octavio T. Nobrega Jan 2013

Effectiveness Of Exercise On Cognitive Impairment And Alzheimer’S Disease, Sandor Balsamo, Jeffrey Willardson, Frederico Santos De Santana, Jonato Prestes, Denise Coscrato Balsamo, Dahan Da Cunha Nascimento, Leopoldo Dos Santos-Neto, Octavio T. Nobrega

Jeffrey Willardson

Physical activity has a protective effect on brain function in older people. Here, we briefly reviewed the studies and results related to the effects of exercise on cognitive impairment and Alzheimer’s disease. The main findings from the current body of literature indicate positive evidence for structured physical activity (cardiorespiratory and resistance exercise) as a promising non-pharmacological intervention for preventing cognitive decline. More studies are needed to determine the mechanisms involved in this preventative effect, including on strength, cardiorespiratory, and other types of exercise. Thus, the prevention of Alzheimer’s disease may depend on healthy lifestyle habits, such as a ...


Effects Of Different Antagonist Protocols On Repetition Performance And Muscle Activation, Andrade Paz, Jeffrey Willardson, Roberto Simao, Humberto Miranda Jan 2013

Effects Of Different Antagonist Protocols On Repetition Performance And Muscle Activation, Andrade Paz, Jeffrey Willardson, Roberto Simao, Humberto Miranda

Jeffrey Willardson

Objective: To investigate the acute effects of different antagonist manipulation protocols on maximal repetition performance and muscle activation during seated row (SR) exercise. Methods: Fifteen men (22.4 ± 1.1 years old, height 175 cm ± 5.5, weight 76.6 kg ± 7, and 12.3 ± 2.1 of body fat percentage) with previous resistance training experience (3.5 ± 1.2 years) performed four experimental protocols: (TP) one set to repetition failure of SR exercise; (AS) Antagonist static stretching for the pectoralis major (PM) followed by one set of SR; (PNFA) Proprioceptive neuromuscular facilitation for PM followed by one set of ...


Exercise And Blood Flow Restriction, Zachary K. Pope, Jeffrey Willardson, Brad J. Schoenfeld Jan 2013

Exercise And Blood Flow Restriction, Zachary K. Pope, Jeffrey Willardson, Brad J. Schoenfeld

Jeffrey Willardson

Pope, ZK, Willardson, JM, and Schoenfeld, BJ. Exercise and blood flow restriction. J Strength Cond Res 27(10): 2914– 2926, 2013—A growing body of research has demonstrated the effectiveness of exercise (low-intensity resistance training, walking, cycling) combined with blood flow restriction (BFR) for increased muscular strength and hypertrophy. The BFR is achieved via the application of external pressure over the proximal portion of the upper or lower extremities. The external pressure applied is sufficient to maintain arterial inflow while occluding venous outflow of blood distal to the occlusion site. With specific reference to low-intensity resistance training, the ability to ...


Comparing Thigh Muscle Cross-Sectional Area And Squat Strength Among National Class Olympic Weightlifters, Power Lifters, And Bodybuilders, James J. Di Naso, Brian L. Pritschet, John D. Emmett, Jill W. Owen, Jeffrey Willardson, Travis W. Beck, Jason M. Defreitas, Fabio E. Fontana Jun 2012

Comparing Thigh Muscle Cross-Sectional Area And Squat Strength Among National Class Olympic Weightlifters, Power Lifters, And Bodybuilders, James J. Di Naso, Brian L. Pritschet, John D. Emmett, Jill W. Owen, Jeffrey Willardson, Travis W. Beck, Jason M. Defreitas, Fabio E. Fontana

Jeffrey Willardson

Few studies have compared anthropometric characteristics among national class athletes from different resistance training disciplines, such as Olympic Weightlifting (OL), Power Lifting (PL), and Bodybuilding (BB). Objective: The purpose of the current study was to determine if significant differences exist in the relationship between thigh muscle cross-sectional area and back squat strength among national class athletes from the sports of OL, PL, and BB. Methods: Fifteen national class athletes were assessed for back squat strength, mid-thigh circumference, and mid-thigh skinfold from which total thigh cross-sectional was estimated. A series of One-Way ANOVAs and Pearson Product Moment Correlations were used to ...


Is Training To Failure A Safe And Effective Method For Improving Athletic Performance?, Andy V. Khamoui, Jeffrey Willardson Jan 2011

Is Training To Failure A Safe And Effective Method For Improving Athletic Performance?, Andy V. Khamoui, Jeffrey Willardson

Jeffrey Willardson

TRAINING TO FAILURE IS A POPULAR TRAINING METHOD USED TO IMPROVE MUSCULAR STRENGTH, SIZE, AND ENDURANCE. AT THIS TIME, THE VALUE OF THIS TRAINING STRATEGY FOR IMPROVING ATHLETIC PERFORMANCE IS A TOPIC OF CONSIDERABLE DEBATE. IN THIS COLUMN, THE POTENTIAL BENEFITS AND DETRIMENTS OF THIS TRAINING METHOD WILL BE PRESENTED.


Effect Of Varying Rest Intervals Between Sets Of Assistance Exercises On Creatine Kinase And Lactate Dehydrogenase Responses, Marco Machado, Alexander J. Koch, Jeffrey Willardson, Luis Prereira, Isabel M. Cardoso, Michela Ks Motta, Rafael Prereira, Andre N. Monteiro Jan 2011

Effect Of Varying Rest Intervals Between Sets Of Assistance Exercises On Creatine Kinase And Lactate Dehydrogenase Responses, Marco Machado, Alexander J. Koch, Jeffrey Willardson, Luis Prereira, Isabel M. Cardoso, Michela Ks Motta, Rafael Prereira, Andre N. Monteiro

Jeffrey Willardson

Effect of varying rest intervals between sets of assistance exercises on creatine kinase and lactate dehydrogenase responses. J Strength Cond Res 25(5): 1339-1345, 2011-To examine the effects of different rest intervals between sets on serum creatine kinase (CK) and lactate dehydrogenase (LDH) activity, 10 men (age = 25.6 ± 2.2 years, height = 173.1 ± 7.1 cm, and body mass = 75.9 ± 10.0 kg) participated in a randomized within-subject design that involved 4 resistance exercise sessions. Each session consisted of 4 sets of 10 repetitions with 10 repetition maximum loads for the chest press, pullover, biceps curl, triceps ...


Strength And Hypertrophy Responses To Constant And Decreasing Rest Intervals In Trained Men Using Creatine Supplementation, Tacito P. Souza-Junior, Jeffrey M. Willardson, Richard Bloomer, Richard D. Leite, Steven J. Fleck, Paulo R. Oliveira, Robert Simao Jan 2011

Strength And Hypertrophy Responses To Constant And Decreasing Rest Intervals In Trained Men Using Creatine Supplementation, Tacito P. Souza-Junior, Jeffrey M. Willardson, Richard Bloomer, Richard D. Leite, Steven J. Fleck, Paulo R. Oliveira, Robert Simao

Jeffrey Willardson

The purpose of the current study was to compare strength and hypertrophy responses to resistance training programs that instituted constant rest intervals (CI) and decreasing rest intervals (DI) between sets over the course of eight weeks by trained men who supplemented with creatine monohydrate (CR).


Caffeine Does Not Augment Markers Of Muscle Damage Or Leukocytosis Following Resistance Exercise, Marco Machado, Alexander J. Koch, Jeffrey Willardson, Frederico C. Dos Santos, Victor M. Curty, Lucan N. Pereira Jan 2010

Caffeine Does Not Augment Markers Of Muscle Damage Or Leukocytosis Following Resistance Exercise, Marco Machado, Alexander J. Koch, Jeffrey Willardson, Frederico C. Dos Santos, Victor M. Curty, Lucan N. Pereira

Jeffrey Willardson

The purpose of this study was to evaluate the effects of caffeine ingestion before a resistance exercise session on markers of muscle damage (CK, LDH, ALT, AST) and leukocyte levels. Methods: Fifteen soccer athletes completed two resistance exercise sessions that differed only in the ingestion of caffeine or a placebo preworkout. Results: CK concentration increased significantly following the caffeine session (415.8 ± 62.8 to 542.0 ± 73.5) and the placebo session (411.5 ± 43.3 to 545.8 ± 59.9), with no significant differences between sessions. Similarly, LDH concentration increased significantly following the caffeine session (377.5 ± 18 ...


Effect Of Different Resistance Exercise Repetition Velocities On Excess Post-Exercise Oxygen Consumption And Energetic Expenditure, Ana Critine Barreto, Alex Souto Maior, Pedro Menzes, Jeffrey Willardson, Antonio Jose Silva, Victor Machado Reis, Roberto Simão, Jefferson Novaes Jan 2010

Effect Of Different Resistance Exercise Repetition Velocities On Excess Post-Exercise Oxygen Consumption And Energetic Expenditure, Ana Critine Barreto, Alex Souto Maior, Pedro Menzes, Jeffrey Willardson, Antonio Jose Silva, Victor Machado Reis, Roberto Simão, Jefferson Novaes

Jeffrey Willardson

The excess post-exercise oxygen consumption (EPOC) consists of the excess oxygen consumed above a resting state following exercise. Performance of resistance exercise can significantly disrupt the body’s homeostasis, with the EPOC being dependent on the specific combination of prescriptive variables. Presently, the effects of different repetition velocities on VO2 and caloric expenditure during and following resistance exercise bouts have not been completely elucidated. Objective: To examine the effect of different repetition velocities on EPOC and total energetic expenditure during and following resistance exercise bouts. Methods: Twenty women (34.6 ± 5.5 years; 159 ± 4.1 cm; 55.1 ± 3 ...


Effect Of Surface Stability On Core Muscle Activity For Dynamic Resistance Exercises, Jeffrey Willardson, Fabio E. Fontana, Eadric Bressel Jan 2009

Effect Of Surface Stability On Core Muscle Activity For Dynamic Resistance Exercises, Jeffrey Willardson, Fabio E. Fontana, Eadric Bressel

Jeffrey Willardson

To compare core muscle activity during resistance exercises performed on stable ground vs. the BOSU Balance Trainer. Methods: Twelve trained men performed the back squat, dead lift, overhead press, and curl lifts. The activity of the rectus abdominis, external oblique abdominis, transversus abdominis/internal oblique abdominis, and erector spinae muscles was assessed. Subjects performed each lift under three separate conditions including standing on stable ground with 50% of a 1-RM, standing on a BOSU Balance Trainer with 50% of a 1-RM, and standing on stable ground with 75% of a 1-RM. Results: Significant differences were noted between the stable 75 ...


Effect Of Rest Interval Length On The Volume Completed During Upper Body Resistance Exercise, Humberto Miranda, Roberto Simão, Leonardo Marmo Moreira, Renato Aparecido De Souza, João Antônio Alves De Souza, Belmiro Freitas De Salles, Jeffrey Willardson Jan 2009

Effect Of Rest Interval Length On The Volume Completed During Upper Body Resistance Exercise, Humberto Miranda, Roberto Simão, Leonardo Marmo Moreira, Renato Aparecido De Souza, João Antônio Alves De Souza, Belmiro Freitas De Salles, Jeffrey Willardson

Jeffrey Willardson

The purpose of the current study was to compare the workout volume (sets x resistance x repetitions per set) completed during two upper body resistance exercise sessions that incorporated 1 minute versus 3 minute rest intervals between sets and exercises. Twelve trained men completed two experimental sessions that consisted of 5 upper body exercises (i.e. barbell bench press, incline barbell bench press, pec deck flye, barbell lying triceps extension, triceps pushdown) performed for three sets with an 8- RM load. The two experimental sessions differed only in the length of the rest interval between sets and exercises; one session ...


A Comparison Of Once Versus Twice Per Week Training On Leg Press Strength In Women, J. Burt, R. Wilson, Jeffrey Willardson Jan 2007

A Comparison Of Once Versus Twice Per Week Training On Leg Press Strength In Women, J. Burt, R. Wilson, Jeffrey Willardson

Jeffrey Willardson

The purpose of this study was to compare strength differences between 2 groups of untrained women, who performed a single set of the leg press exercise once or twice per week. Methods. Twenty-one women were divided randomly into 2 groups: Group 1 (n=10) performed a single set of the leg press exercise once per week, while Group 2 (n=11) performed a single set of the leg press exercise twice per week for a period of 8 weeks. Throughout the duration of the study, an amount of resistance was utilized that allowed for a single set of 6 to ...