Kinesiology Commons^™

Effects Of Different Rest Intervals Between Antagonist Paired Sets On Repetition Performance And Muscle Activation, Mariana F. Maia, Jeffrey M. Willardson, Gabriel A. Paz, Humberto Miranda

Faculty Research and Creative Activity

Effects

of different rest intervals between antagonist paired sets on

repetition performance and muscle activation. J Strength

Cond Res 28(9): 2529–2535, 2014—Recent evidence

suggests that exercising the antagonist musculature acutely

enhances subsequent performance for the agonist musculature.

The purpose of this study was to examine the effects of

different rest intervals between sets for exercises that involve

antagonistic muscle groups, a technique referred to as

antagonist paired sets (APS). Fifteen recreationally trained

men were tested for knee extension (KE) exercise performance,

with or without previous knee flexion (KF) exercise

for the antagonist musculature. The following protocols were

performed in random …

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

Faculty Research and Creative Activity

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 …

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

Faculty Research and Creative Activity

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.

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

Faculty Research and Creative Activity

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 …

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

Faculty Research and Creative Activity

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 ± 18.0 to 580.5 ± 36.1) …

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

Faculty Research and Creative Activity

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 ± 3.4 kg; 24±2.5 …

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

Faculty Research and Creative Activity

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% of …