Kinesiology Commons^™

Acute Effects Of Different Set Configurations On Neuromuscular, Metabolic, And Perceptual Responses In Young Women, Francisco Dalton-Alves, Lígia Martins, Witalo Kassiano, Mário Simim, Alexandre I. A. Medeiros, Cláudio De O. Assumpção

International Journal of Exercise Science

International Journal of Exercise Science 16(4): 974-986, 2023. We compared neuromuscular, metabolic, and perceptual responses between different resistance training configurations in young women. In a counterbalanced randomized order, 13 young women performed the following protocols in separate sessions (sets x repetitions): traditional (TRAD): 5x10, 90-s of rest interval between sets; more frequent and shorter total rest (FSR): 10x5, 30-s of rest interval between sets. The sessions were composed of leg press exercise with the same intensity. Force (maximum voluntary isometric contraction [MVIC]) and metabolic (lactate concentration) responses were measured pre- and post-resistance training sessions. The rating of perceived exertion (RPE) …

Does Beta-Alanine Supplementation Potentiate Muscle Performance Following 6 Weeks Of Blood Flow Restriction Or Traditional Resistance Training?, Kassiana De Araujo Pessoa, Jason Michael Cholewa, Rayssa Sousa-Silva, Xia Zhi, Alessandro M. Zagatto, Antonio Herbert Lancha-Jr, Jakob D. Lauver, Fabricio Eduardo Rossi, Nelo Zanchi

International Journal of Exercise Science

International Journal of Exercise Science 16(2): 999-1011, 2023. We aimed to compare the effects of beta-alanine on Traditional Resistance Training (TRAD) or Blood Flow Restriction Training (BFR). Methods: 19 subjects were randomly allocated to a Placebo (n = 10) or beta-alanine (n = 9) group. Subjects from both groups were trained unilaterally (unilateral arm curl) for six weeks, and each arm was trained using a different paradigm (BFR or TRAD). One repetition maximum (1RM) test measurements were performed before and after the strength training program. Work output was accessed as the total weight lifted (repetitions × weight lifted …

A New, Simple And Practical Approach To Increase The Effects Of Aerobic Exercise On Serum Levels Of Neurotrophic Factors In Adult Males, Mahdi Bahramnejad, Vahid Valipour Dehnou, Rasoul Eslami

International Journal of Exercise Science

International Journal of Exercise Science 16(2): 932-941, 2023. Environmental enrichment (EE) is defined as a combination of complex inanimate and social stimulation. Physical activity and EE may augment the beneficial effects of each other. This study aimed to assess the effects of running in an enriched environment on neurotrophic factors in adult males. Twelve volunteer adult males (age 26.75 ± 5.34 yrs, body mass 70.72 ± 8.61 kg, height 172.50 ± 5.68 cm, VO_2max 56.8 ± 2.93) completed two sessions, each consisted of one hour of running at an intensity of 12-13 on the Borg Scale. One session was …

Performance Kinetics During Repeated Sprints Is Influenced By Knowledge Of Task Endpoint And Associated Peripheral Fatigue, François Billaut, Marie R. Demers, Andrew Hibbert

International Journal of Exercise Science

International Journal of Exercise Science 16(1): 987-998, 2023. The regulation of exercise intensity allows an athlete to perform an exercise in the fastest possible time while avoiding debilitating neuromuscular fatigue development. This phenomenon is less studied during intermittent activities. To investigate anticipatory and real-time regulation of motor output and neuromuscular fatigue during repeated-sprint exercise, twelve males randomly performed one (S1), two (S2), four (S4) and six (S6) sets of five 5-s cycling sprints. Mechanical work and electromyographic activity were assessed during sprints. Potentiated quadriceps twitch force (ΔQ_tw,pot) and central activation ratio (Q_CAR) were quantified from response …

The Effects Of Postural Education Or Corrective Exercise On The Craniovertebral Angle In Young Adults With Forward Head Posture: A Randomized Controlled Trial, David A. Titcomb, Bridget F. Melton, Theresa Miyashita, Helen W. Bland

International Journal of Exercise Science

International Journal of Exercise Science 16(1): 954-973, 2023. The purpose of this study was to compare the effects of three different intervention strategies, postural education (PE) and two corrective exercise programs (CEPs), on the craniovertebral angle (CVA) in young adults with forward head posture (FHP). A prospective four-arm parallel randomized controlled trial with repeated measures was performed. Seventy-nine healthy young adults (55 women, 24 men; mean age: 20.08 ± 2.19 years) with FHP were randomized into four groups: PE group, self-myofascial release + stretching group (SMRS), self-myofascial release + stretching + strengthening group (SMRSS), and a control group (CG). Participant …

Increasing Trunk Mass Evokes Lower Extremity Biomechanical Plasticity During Stair Descent, Alexis Nelson, Hailey Fong, Alex Carnall, Melissa J. Puppa, Derek Beeler, Cris Stickley, William M. Mihalko, Douglas W. Powell

International Journal of Exercise Science

International Journal of Exercise Science 16(1): 942-953, 2023. The purpose of this study was to investigate the influence of simulated changes in body mass on lower extremity joint work and relative joint contributions during stair descent. Ten healthy recreationally active college-age participants performed five stair descent trials in each of five loading conditions: no added load and with an additional 5%, 10%, 15% and 20% of their body weight. Three-dimensional ankle, knee and hip joint powers were calculated using a six degree-of-freedom model in Visual3D (C-Motion Inc., Germantown, MD, USA). Sagittal plane joint work was calculated as the joint power …

Effects Of Chewing Time On Gastrointestinal Discomfort, Substrate Use, And Performance During Running, Thomas Geaney

Human Movement Studies & Special Education Theses & Dissertations

Previous research has shown that food particle size affects gastric processing. For example, food particles greater than 3 mm may delay gastric emptying under certain conditions. Delays in gastric emptying can be problematic during aerobic exercise, leading to nausea, bloating, fullness, and other gastrointestinal (GI) symptoms. In some cases, symptoms can be severe enough to negatively affect athletic performance. This study investigated the effects of manipulating chewing duration of carbohydrate sports bars on GI discomfort, physiological responses, and performance during endurance running. This crossover study recruited 12 male runners (age: 36.4 ± 7.2 years, VO_2peak: 57.2 ± 4.7 …

The Effects Of Ultra-Marathon Trail Running And The Physiological Response Of Stress On Salivary Biomarkers, Kevan W. Stout, Jeremy R. Pearson, Catherine A. Hambleton, Jake A. Deckert, Philip M. Gallagher

Journal of Human Performance in Extreme Environments

PURPOSE: This study investigated changes in salivary α-amylase (sAA), cortisol, and interleukin-1β (IL-1β) concentrations following completion of an ultra-marathon trail run (UMT) to better understand the physiological stressors imposed by this extreme type of race. METHODS: Eight subjects participated in this study. Each subject completed a 50 km UMT. Two-minute oral salivary swabs were taken 10 minutes prior to race start and again within 1 minute of race finish. Samples were analyzed for sAA, cortisol and IL-1β using ELISA kits. RESULTS: Our results demonstrated a significant increase in both sAA (p = 0.002) and cortisol (p < 0.001) from baseline. No significant differences were observed for IL-1β. There was no significant relationship between the observed sAA increase and race speed. The observed increase in cortisol was significantly correlated with race speed (R² = 0.582, p …

Physical Profile Of Air Force Special Warfare Trainees, Kim A. Feeney, Bridget F. Melton, Helen W. Bland, Greg A. Ryan, Cody R. Butler

International Journal of Exercise Science

International Journal of Exercise Science 16(4): 924-931, 2023. Physical fitness testing in the military is commonly used to assess whether service members are physically capable of performing the diverse physical tasks that may be required for their job. Body composition can influence an individual’s ability to physically perform. This study aimed to analyze the general physical profile of U.S. Air Force (USAF) special warfare candidates by assessing body composition results and physical assessment scores collected over the past four years. Male candidates (n = 1036) were 18.2 years to 39.5 years of age (M = 23.5, SD = …

Test-Retest Reliability Of A 4-Minute All-Out Critical Force Test In Rock Climbers, Zachary J. Mcclean, Keenan Macdougall, Jared R. Fletcher, Saied J. Aboodarda, Brian R. Macintosh

International Journal of Exercise Science

International Journal of Exercise Science 16(4): 912-923, 2023. The purpose of this study was to assess the test-retest reliability of a 4-minute all-out critical force test in well-trained rock climbers. Thirteen rock climbers (n=4 females) completed a familiarization session and two all-out critical force tests on different days. During each trial, participants completed 24 repetitions of 7s right-handed, maximal effort hangs from a 20mm edge interspersed with 3 s rest. The end-test force (EF; i.e., critical force), impulse above EF (IEF), and peak force achieved durin g the test were analyzed with paired t-tests to determine differences between trials. Intraclass …

The Effects Of Ankle Taping On Measures Of Ground Reaction Forces And Jump Height During A Sport-Specific Vertical Jump In Youth Basketball Players, Michelle Pratola, Paolo Sanzo

International Journal of Exercise Science

International Journal of Exercise Science 16(6): 898-911, 2023. The purpose of this study was to investigate the effects of ankle taping using zinc oxide tape versus no tape to measure ground reaction forces (GRF) and vertical jump height during a sport-specific vertical jump test in youth basketball players. Participants were recruited through purposive sampling and completed a basketball specific vertical jump test with and without zinc oxide tape. Mean sway velocity, 95% ellipse area, and path length were measured using the AMTI© force platform and vertical jump height using a Vertec© device. A paired t-test with a significance level of …

Mas And Mans Predicts Repeated Sprint Ability In Youth Soccer Players, Jørgen D. Olsen, Henrik R. Rognhaug, Daniel Kvamme, Øyvind Støren, Eva Maria Støa

International Journal of Exercise Science

International Journal of Exercise Science 16(6): 846-854, 2023. The study investigated the impact of maximal aerobic speed (MAS) and maximal anaerobic sprint (MANS) on repeated sprint ability (RSA) in soccer. Methods: 17 amateur-to semi-professional soccer players, age 19 (± 4) years, were tested for maximal oxygen consumption (VO_2max), oxygen cost of running (C_r), RSA consisting of 15×20m sprint each divided by a 100 seconds dribble track, and 40-meter sprint performance. MAS was calculated as VO_2max × C_r ⁻¹, and MANS was defined as the highest velocity in the 40-meter sprint. Results: There was …

Carbon Fiber Insoles Enhance Perception Of Performance Despite Variable Objective Outcomes: Specific To The Moderately Active Individual, Erin E. Dierickx, Cody R. Butler, Robert A. Huggins, Emma Zuk, Lea C. Mason, Lindsay J. Distefano, Douglas J. Casa

International Journal of Exercise Science

International Journal of Exercise Science 16(4): 885-897, 2023. Carbon fiber insoles (CFIs) may benefit performance in elite athletes, however, their use in moderately active individuals has been adopted without evidence supporting such enhancements in this population. Fifteen male subjects performed vertical jump (VJ) and repeat treadmill sprint tests before and after a VO_2peak while wearing 1) CFIs and 2) control insoles (CON). Subjects completed a subjective survey regarding their perceived performance abilities for both conditions. There were no significant differences between CFIs and CON in VJ height, sprint distance, heart rate following sprints; and rate of oxygen consumption, perceived …

Body Composition (Dxa) And Maximal Strength Of Powerlifters: A Descriptive Quantitative And Longitudinal Study, Pierre-Marc Ferland, Jérémie Charron, Mathieu Brisebois-Boies, Fanie St-Jean Miron, Alain Steve Comtois Phd

International Journal of Exercise Science

International Journal of Exercise Science 16(4): 828-845, 2023. The purpose of this study was to present the relationships between maximal strength and body composition and to conduct yearly follow-ups presenting the chronic effects of maximal strength training on body composition. Thirty-four (age = 28.8 ± 8.7 yrs) classic powerlifters (M = 21; F = 13) completed at least one Dual-Energy X-Ray Absorptiometry (DXA) 43.97 ± 23.93 days after a sanctioned international powerlifting federation affiliate competition (Squat + Bench Press + Deadlift = Total (kg)). In addition, thirteen subjects (n = 13) completed at least one yearly follow up. Paired …

The Acute Effect Of Tissue Flossing On Pain, Function, And Perception Of Movement, Christopher Kelly, Zachary Oliveri, Joseph Saladino, Joseph Senatore, Amy Kamat, Jordan Zarour, Peter C. Douris

International Journal of Exercise Science

International Journal of Exercise Science 16(3): 855-865, 2023. Tissue flossing (TF) is a novel device that has been shown to cause peripheral compression and concurrent change in joint range of motion, perception of mobility and muscular performance. However, the effect of tissue flossing on pain, perception of mobility and function at the elbow joint has not been thoroughly investigated. The purpose of this pilot study was to examine the acute effect of TF on pain and upper extremity functional performance in subjects with musculoskeletal-related complaints of pain surrounding the elbow joint. We utilized a randomized crossover design. Nine resistance trained …

The Impact Of The Cold Pressor Test On Inter-Arm Differences In Blood Pressure, Alyssa C. Watts, Lauren A. Naylor, Michael E. Holmstrup, Brock T. Jensen

International Journal of Exercise Science

International Journal of Exercise Science 16(2): 875-884, 2023. A large inter-arm difference (IAD+; ≥10mmHg between arms at rest) in blood pressure (BP) at rest is linked to cardiovascular risk, and exercise can change this difference. As mechanisms for IAD are elusive, unique physiological stimuli may provide insight towards a better understanding of this phenomenon. The cold pressor test (CPT) has a potent effect on BP and acts primarily through sympathetic nervous system (SNS) stimulation, though the effects of SNS stimulation on IAD are unknown. Therefore, the purpose of the present study was to examine the effects of the CPT on …

Effects Of Different Surfaces On Metabolic Cost During Repetitive Jumping: A Pilot Study, Scott Lyons, Kyle Reason, Danilo Tolusso, Ariel Weddle

International Journal of Exercise Science

International Journal of Exercise Science 16(2): 866-874, 2023. The purpose of this pilot study was to determine if there is a difference in metabolic cost when jumping on platforms of varying thickness, as well as whether a difference exists in metabolic cost between genders exists on the different platforms. Fourteen participants (seven males and seven females) completed three repetitive jumping trials on the DigiJump machine. Each trial was performed at a cadence of 120 jumps per minute and at a minimum height of 1/2” per jump. Trials were completed on platforms of 1/2”, 3/8”, and 1/4” thickness. Participants were instructed …

Characterization And Estimation Of Musculoskeletal Pain Using Machine Learning, Boluwatife Faremi

Master's Theses

Traditional scales utilized for recording pain are known to be highly subjective and biased due to inaccuracies in recollecting actual pain intensities. As a result, machine learning (ML) models that are trained using these scores as ground truth are reported to have low performance for objective pain classification because of the huge disparity between what was felt in moments of pain and the scores recorded afterward.

In the present study, two devices were designed for gathering real-time, continuous in-session subjective pain scores and the recording of the autonomic nervous system (ANS) altered endodermal (EDA) activity. 24 participants were recruited to …

Energy Costs Of Chair Sitting And Standing Video Exercises In Chinese Older Adults, Ages 60 To 89 Years, Zhenghua Cai, Minghui Quan, Muyang Huan, Guangli Sun, Stephen D. Herrmann, Barbara E. Ainsworth, Peijie Chen

International Journal of Exercise Science

International Journal of Exercise Science 16(7): 814-827, 2023. Home-based video exercise interventions improve older adults’ physiological performance and functional capacity. Little is known about the energy costs of video exercises in older adults. The Compendium of Physical Activities (PAs) has few items with PA metabolic equivalents (METs) in older adults. This study measured the energy costs of four chair and two standing exercises (sitting Tai Chi, Yoga, mobility ball, aerobics: standing, slow aerobics, and fast aerobics). Fifteen females and 14 males, 62-87 years (M ± SD, 73 ± 7.7 years), were categorized into three age groups (60-69, 70-79, 80-89). Oxygen …

Two Different Approaches To Dry-Land Training Do Not Improve The Water Performance Of Swimmers, Matheus Silva Norberto, Carlos Augusto Kalva-Filho, Guilherme Navarro Schneider, Eduardo Zapaterra Campos, Marcelo Papoti

International Journal of Exercise Science

International Journal of Exercise Science 16(6): 770-790, 2023. Literature diverges about the performance improvement after dry-land training. Thus, the objective of the present study was to compare the effect of two models of dry-land training. Twenty-nine swimmers were divided into three groups, combined strength and power training (PTG), only strength training (STG), and a control group (CG). Measurements were taken for six weeks, before dry-land exposure (M1), after four weeks of specific training with exposure to dry-land training by two groups (M2), and after two weeks of taper without exposure to dry-land training (M3). Strength in specific exercises, jumping tests, …

Influence Of Systematic Training On Morpho-Physiological And Motor Ability Profiles Of Indian Young Female Rowers, Kayakers And Canoers, Tamoghni Manna, Snehunsu Adhikari, Alak Kumar Syamal

International Journal of Exercise Science

International Journal of Exercise Science 16(6): 744-755, 2023. Our study was carried on junior female athletes (22 rowers, 11 kayakers and 7 canoers) adopting systemic training to explore the possible training manipulation that can be implicated in these three kinds of water sports, might be in a different way. Several morpho-physiological parameters and motor ability profiles were measured by standard methods. Accordingly, body weight (kg), performing time of 2.4 km run (sec), 6×10 meters shuttle run/agility (sec) of female rowers were reduced progressively and significantly from Preparatory Period (PP1) to General Practice Period (GPP) i.e., from (59.41±4.84) to (52.23±5.34), (773.04±92.64) …

Psychological And Physiological Responses Across Six Weeks Of Hiit And Mict In Previously Inactive Young Adults, Emily R. Dunston, Katrina Taylor

International Journal of Exercise Science

International Journal of Exercise Science 16(5): 756-769, 2023. High-intensity interval training (HIIT) is suggested as a public health strategy to increase engagement in, and adherence to, physical activity. However, debate exists regarding the efficacy in inactive individuals. PURPOSE: To determine the physiological and psychological responses to three weeks of supervised and three weeks of unsupervised HIIT or moderate-intensity continuous training (MICT) in previously inactive adults. METHODS: Young adults (n = 20; 21.4 ± 2.2 years; 13 females) were randomized to six weeks of HIIT or MICT. Pre- and post-testing included anthropometric measures, an incremental exercise test, and body composition. …

The Effects Of Hiit Versus Mict And Sedentary Controls On Blood Lipid Concentrations In Nondiabetic Overweight And Obese Young Adults: A Meta-Analysis., Christian P. Mccormick, Garrett Mamikunian, David B. Thorp

International Journal of Exercise Science

International Journal of Exercise Science 16(3): 791-813, 2023. With rates of obesity and dyslipidemia rising among young adults, this meta-analysis aimed to compare the effects of high-intensity interval training (HIIT) versus moderate-intensity continuous training (MICT) and sedentary controls (CON) on low-density lipoprotein (LDL), high-density lipoprotein (HDL), triglyceride (TG), and total cholesterol (TC) in nondiabetic overweight and obese young adults to determine if HIIT or MICT is more efficacious in improving dyslipidemia. Studies included in the analysis had to be randomized controlled trials or quasi-experimental studies, comparing the effects of HIIT versus MICT or CON on at least three variables of …

Resistance Training And Running Performance And Economy: A Literature Review, James Bottrill

University Honors Theses

Running performance is largely determined by maximal oxygen uptake (VO₂ max), velocity at VO₂ max, fractional utilisation of VO₂ max and running economy. Running economy is relatively under-researched and could be improved by resistance training because of its neuromuscular underpinnings. However, existing research on this topic is quite unorganised and inconclusive and is yet to prove a direct linkage between resistance training, running economy and performance. This literature review aimed to provide an organised overview of the existing literature, identify and address confounding variables and provide recommendations for future research. A search for studies was conducted via …

The Role Of Footwear, Foot Orthosis And Training-Related Strategies In The Prevention Of Bone Stress Injuries: A Systematic Review And Meta-Analysis, Alexandre Lavigne, Dominic Chicoine, Jean-François Esculier, François Desmeules, Pierre Fremont, Blaise Dubois

International Journal of Exercise Science

International Journal of Exercise Science 16(3): 721-743, 2023. Objective: To evaluate the effectiveness of footwear, foot orthoses and training-related strategies to prevent lower extremity bone stress injury (BSI). Design: Systematic review and meta-analysis. Data sources: Four bibliographic databases (from inception until November 2021): Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE and CINAHL. Eligibility criteria: Randomised controlled trials (RCTs) that assessed the risk of developing a BSI when using particular footwear, foot orthoses or training-related strategies such as muscle strengthening, stretching, and mechanical loading exercises. Results: Eleven studies were included in this systematic review. When wearing foot orthoses, the risk …

External Workloads Vary By Position And Game Result In Us-Based Professional Soccer Players, Gary M. Long, Sam M. Joyce, Robert T. Herrington, Kyle B. Fox, Jack E. Mumaugh

International Journal of Exercise Science

International Journal of Exercise Science 16(6): 688-699, 2023. Professional soccer is a physically demanding sport that requires players to be highly trained. Advances using GPS allow the tracking of external workloads for individual players in practice and competition, however, there is a lack of evidence on how these measures impact match results. Therefore, we analyzed external workloads by player position and determined if they vary depending on the result of competitive matches. External workloads were analyzed in professional soccer players (n = 25) across 28 competitive games. One-way ANOVA determined if workloads varied by position (striker – ST, wide …

Efficacy Of A 6-Week Novel Exergaming Intervention Guided By Heart Rate Zones On Aerobic Performance In Children With Fetal Alcohol Spectrum Disorder And Attention-Deficit/Hyperactivity Disorder: A Feasibility Study, Trent Yamamoto, Bilal Pandit, Michael Viggiano, Mitchell S. Mologne, Kristin Daniels, David Gomez, Brett A. Dolezal

International Journal of Exercise Science

International Journal of Exercise Science 16(3): 710-720, 2023. The purpose of this study was to determine the feasibility of a novel exergaming intervention guided by heart rate zones for children and adolescents with fetal alcohol spectrum disorder (FASD) and attention-deficit/hyperactivity disorder (ADHD). Eight study participants (6 females, 2 males, mean age= 11.4±1.4 years old) participated twice weekly over six weeks to complete twelve multimodal exergaming sessions. Participants significantly improved 6MWT from baseline to week 6 (575.4±55.0 m to 732.8±58.9 m; P<0.01), which conferred a 31% improvement in estimated VO_2max (31.5±5.5 ml/kg/min to 40.9±5.9 ml/kg/min), respectively. There was an upward trend of the mean percentage of time spent …

Body Mass Index But Not Physical Activity Level Moderates Lowered Cardiac Baroreflex Sensitivity In People Living With Hiv, Marcus Rangel, Juliana Barros, Deysiane Peres, Pedro Mira, Daniel Martinez, Mateus Laterza, Paulo Farinatti, Juliana Borges

International Journal of Exercise Science

International Journal of Exercise Science 16(2): 700-709, 2023. Reduced cardiac baroreflex sensitivity (cBRS) is an autonomic marker associated with a worse cardiovascular prognosis. Whether cBRS is lowered in people living with HIV (PLHIV) is yet unclear, as well as potential moderator effects of body mass index (BMI) or physical activity (PA) level. The present study aims to compare the spontaneous cBRS in PLHIV vs. HIV-uninfected controls, and to determine among PLHIV the relationship between cBRS vs. body mass index (BMI) and PA level. Total, upward (cBRS+), and downward (cBRS-) cBRS gains were assessed using the sequential method from beat-to-beat …

Biomechanical And Psychophysical Underpinnings Of Balance Dysfunction In Individuals With Traumatic Brain Injury, Naphtaly Ehrenberg

Dissertations

Falls are a major burden on healthcare infrastructure, especially in older adults and even more so in older individuals that are living in institutions. According to data from the Centers for Disease Control and Prevention (CDC), from 2010 to 2020, unintentional falls were the leading cause of nonfatal emergency department visits for all age groups except among individuals from 15-24 years of age, where unintentional falls ranked a very close second to being unintentionally struck by or against. Among older individuals living in the community, approximately 30-35% fall at least once in a given year, and around three times as …

Effect Of Static Stretching On Agonists, Antagonists, And Agonist-Antagonist Combination On Total Training Volume, Diego Pessoa, Henrique Penfold, Sincler Pegado, Michel Gonçalves, Juliana Brandão Pinto De Castro, Jeffrey Willardson, Humberto Miranda

International Journal of Exercise Science

International Journal of Exercise Science 16(4): 665-675, 2023. The purpose of this study was to examine the effects of static stretching (SS) of agonists and antagonists between sets on the total training volume (TTV) performed across multiple sets for the leg extension exercise. Twelve male subjects with experience in resistance training (RT) participated in this study. Subjects performed 10 repetition maximum (10RM) test and retest trials for the leg extension exercise. Four different protocols were randomly applied as follows: quadriceps stretching (AG); hamstrings stretching (AN); quadriceps and hamstrings stretching (AGN); and traditional control without stretching (TR). Significant differences (p≤0.05) were …