Life Sciences Commons^™

The Effect Of Exercise Mode And Intensity Of Submaximal Physical Activities On Salivary Testosterone To Cortisol Ratio And Α-Amylase In Young Active Males, Mohammad Ali Azarbayjani, Hoseyn Fatolahi, Mohammad Javad Rasaee, Maghsod Peeri, Roholah Babaei

International Journal of Exercise Science

We examined the effect of exercise intensity and mode on the acute responses of free testosterone to cortisol ratio and salivary α-amylase. We also evaluated the relationship between cortisol and salivary α-amylase. Ten healthy young active males participated voluntarily in this study in six single sessions. They exercised on a cycle ergo meter, treadmill, and elliptical instrument at intensities of 70% and 85% maximum heart rate for 25 minutes. Saliva samples were collected 5 minutes before and 5 minutes after each exercise session. No significant changes were observed for cortisol. Free testosterone to cortisol ratio increased during each exercise session …

Influence Of Differences In Exercise-Intensity And Kilograms/Set On Energy Expenditure During And After Maximally Explosive Resistance Exercise, Scott A. Mazzetti Ph.D., Christopher Wolff, Brittany Collins, Michael T. Kolankowski, Brittany Wilkerson, Matthew Overstreet, Troy Grube

International Journal of Exercise Science

With resistance exercise, greater intensity typically elicits increased energy expenditure, but heavier loads require that the lifter perform more sets of fewer repetitions, which alters the kilograms lifted per set. Thus, the effect of exercise-intensity on energy expenditure has yielded varying results, especially with explosive resistance exercise. This study was designed to examine the effect of exercise-intensity and kilograms/set on energy expenditure during explosive resistance exercise. Ten resistance-trained men (22±3.6 years; 84±6.4 kg, 180±5.1 cm, and 13±3.8 %fat) performed squat and bench press protocols once/week using different exercise-intensities including 48% (LIGHT-48), 60% (MODERATE-60), and 72% of 1-repetition-maximum (1-RM) (HEAVY-72), plus …

Impact Of Exercise Partner Attractiveness On Mood, Enjoyment, And Exertion, Thomas G. Plante, Sarah Gregg, Jaclyn Rubbo, Thomas Favero, Ashley Morisako, Jessica Cuadra

International Journal of Exercise Science

Social comparison theory was used to examine if males exercising with a female research confederate posing as either attractive or unattractive would alter their exercise mood, exertion, and enjoyment. A total of 101 college students (51 males and 51 females) were randomly assigned to one of three conditions: biking alone, biking with an attractive female confederate, or biking with the same female confederate appearing unattractive. All participants were instructed to complete 20 minutes of exercise at 60%-70% of their maximum target heart rate. Standard exercise mood measures (e.g., Activation-Deactivation Adjective Check List) were administered immediately prior to and immediately following …

Do Exergames Allow Children To Achieve Physical Activity Intensity Commensurate With National Guidelines?, Rachel Perron, Courtney Graham, Jamie Feldman, Rebecca Moffett, Eric E. Hall

International Journal of Exercise Science

The purpose of this study was to determine if two popular exergames, Wii Fit™ and EA Sports Active™, both games for the Nintendo Wii™ console, help children achieve intensity consistent with recommended physical activity guidelines. Thirty children (19 males and 11 females, Mean age = 9.4 ± 1.8 years) participated in this study by playing each game during one research session. During the session participants wore a heart rate monitor and accelerometer to measure exercise intensity. Perceived exertion (RPE) was measured with the children’s run/walk OMNI scale. All three measures of exercise intensity (heart rate, accelerometer counts, and RPE) found …

Oxidative Stress Response To Short Duration Bout Of Submaximal Aerobic Exercise In Healthy Young Adults, Keith M. Diaz, Deborah L. Feairheller Phd, Kathleen M. Sturgeon, Sheara T. Williamson, Michael D. Brown

International Journal of Exercise Science

The purpose of this study was to investigate the oxidative stress response to a short duration bout of submaximal exercise in a cohort of healthy young adults. 15 apparently healthy college age males and females completed a modified Bruce-protocol treadmill test to 75-80% of their heart rate reserve. Blood samples collected immediately before (pre-exercise), immediately after, 30, 60 and 120 minutes post-exercise were assayed for total antioxidant capacity (TAC), superoxide disumutase (SOD), thiobarbituric acid-reactive substances (TBARS), and protein carbonyls (PC). SOD activity was significantly increased from pre-exercise levels at 30 minutes (77%), 60 minutes (33%), and 120 minutes (37%) post-exercise. …

The Relationship Between Stride Rates, Lengths And Body Size And Their Affect On Elite Triathletes’ Running Performance During Competition, Grant J. Landers, Brian A. Blanksby, Timothy R. Ackland

International Journal of Exercise Science

Previous research has suggested that a degree of predictability exists in the relationship between self-selected running stride rates (SR) and stride lengths (SL) with measures of body size such as mass, height and limb lengths. Significant correlations have also been revealed between these body size measures and performance and between SL and performance. However, there is also evidence to suggest that triathlon performance may be related to maintaining a longer SL during the final run. Hence, the aim of this investigation was to examine whether there was any relationship between SR and SL, with body masses and heights of senior …

Repeated Sprint Performance In Male And Female College Athletes Matched For Vo2max Relative To Fat Free Mass, Amanda L. Mageean, Ryan P. Alexander, Constance M. Mier

International Journal of Exercise Science

The purpose of this study was to examine gender differences in repeated sprint exercise (RSE) performance among male and female athletes matched for VO2max relative to FFM (VO2max FFM). Thirty nine male and female college athletes performed a graded exercise test for VO2max and hydrostatic weighing to determine FFM. From the results, 11 pairs of males and females matched for VO2max FFM (mean ± SD; 58.3 ± 4.3 and 58.9 ± 4.6 ml.kg FFM-1.min-1; men and women, respectively) were identified. On a separate day, matched participants performed a RSE protocol that consisted of five 6-sec cycle sprints with 30-sec recovery …

Outcomes Of A Family Based Pediatric Obesity Program - Preliminary Results, Meghan L. Ruebel, Kate A. Heelan, R.Todd Bartee, Nancy Foster

International Journal of Exercise Science

Children that are classified as obese (body mass index (BMI) > 95th percentile for age and sex, Centers for Disease Control and Prevention) have an increased risk for metabolic and cardiovascular complications. Family based programs that focus on physical activity (PA) and healthy eating are recommended for treatment of pediatric obesity. The purpose of the current study is to determine the outcomes of Building Healthy Families (BHF), a family-based pediatric weight loss treatment program composed of nutrition, physical activity and behavioral modification strategies. In addition, mediating variables that are associated with weight loss in children, in order to enhance the retention …

Case Study On The Development Of The International Journal Of Exercise Science, Scott Lyons

International Journal of Exercise Science

The International Journal of Exercise Science is a quarterly, online, open access publication dedicated to the dissemination of research in the areas of Exercise Science, Exercise Physiology, Human Performance, Kinesiology, and related disciplines. Dr. James W. Navalta and Dr. T. Scott Lyons (the author), both Associate Professors of Exercise Science at Western Kentucky University, are the founders of the International Journal of Exercise Science (IJES). IJES is a student-focused journal, in that the editors are specifically seeking research that is led by graduate or undergraduate students. Manuscripts submitted by professionals (defined as those holding a terminal degree) are also gladly …

Exercise-Induced Lymphocyte Apoptosis And Relationship With Level Of Lactate In Smokers And Non-Smokers, Kyung-Shin Park, Yang Lee

International Journal of Exercise Science

Purposes of this study were 1) to examine the exercise intensity where lymphocyte apoptosis index (AI) is significantly increased in smokers and non-smokers, 2) to find out whether AI is associated with level of lactate (L). METHODS: Fourteen healthy untrained smokers (≥ 1 pack year, n=7) and non-smokers (n=7) aged 18 to 26 were recruited. Each subject conducted three treadmill runs at different intensities randomly. Running distance for all three runs was equivalent to 30 minute run at 70% VO2max. AI and L were analyzed at rest (Pre), immediately after (Post), and 1 h following (1 h post) each run. …

Presence Of Observers Increases One Repetition Maximum In College-Age Males And Females, Steven C. Baker, Alan P. Jung, John K. Petrella

International Journal of Exercise Science

Purpose: To determine if the presence of observers affects muscular strength performance in college-age males and females. Methods: Twenty-five women and 24 men participated in the study. Two counter-balanced trials were performed in which participants completed 1-RM tests in bench press and leg press. During one trial, two members of the opposite gender observed the 1-RM tests. During the other trial there were no observers, other than the tester. Results: 1-RM for females increased 3.4±0.8 lbs on bench press (p<.001) and increased 9.2±3.8 lbs on leg press (p=.025) when observers were present. 1-RM for males increased 4.2±1.1 lbs on bench press (p=.001) and increased 18.8±5.2 lbs on leg press (p=.002) with observers present. There was no difference in the percent increase in 1-RM between males and females for either leg press (p=.71) or bench press (p=.08). Conclusion: College-age males and females lifted more weight during a 1-RM test when observers were present.

Effects Of Backward Walking On Hamstring Flexibility And Low Back Range Of Motion, Chet R. Whitley, Janet S. Dufek

International Journal of Exercise Science

The purpose of the study was to examine the effects of backward walking on hamstring flexibility and low back range of motion. Ten healthy female volunteers (29.9±10.0 yr; 165.1±8.2 cm; 68.53±18.4 kg) completed pre-post laboratory testing surrounding a 4-week intervention of backward walking. During the pretest, each participant walked forward on a treadmill at a preferred velocity for 3-5 min. A biaxial electrogoniometer was secured externally to the low back and a sit-and-reach test was performed. Each participant then walked backward at their preferred pace on a treadmill for 10 min, during which time low back motion data were obtained …

Intermittent Vs Continuous Graded Exercise Test For Vo2max In College Soccer Athletes, Constance M. Mier, Ryan P. Alexander

International Journal of Exercise Science

The purpose of this study was to determine if a 1-min active recovery between stages during a graded exercise test (GXT) would result in a higher stage intensity and maximum oxygen uptake in college soccer athletes. Eleven athletes completed two GXT protocols on separate days. Each GXT consisted of 2-min stages performed at a constant running speed and incremental increases of 2.5% grade. One GXT was performed continuously and the other was intermittent with 1-min active recovery between each stage. Tests were performed to volitional fatigue. Following the each GXT and a 10-min active recovery period, participants performed a verification …

Accuracy Of Consumer Grade Bioelectrical Impedance Analysis Devices Compared To Air Displacement Plethysmography, Janet T. Peterson, Wendy E. S. Repovich, Carlye R. Parascand

International Journal of Exercise Science

The purpose of this study was to examine the accuracy of percent body fat estimates from seven different bioelectrical impedance analysis (BIA) models and a seven-site skin fold formula (SKF) compared with air displacement plethysmography (ADP) in females. Eighty-two female volunteers ranging from 19-67 years (31.96 ± 1.39) enrolled in this study. Body composition was assessed by seven site skin folds (SKF), ADP, Tetrapolar BIA (TBIA), and five consumer grade BIA devices: finger to finger (FF), hand to hand (HH) and three different leg to leg (LL1, LL2, LL3) models. In addition, LL3 was analyzed using the athletic (LL3a) and …

Does The Friel Anaerobic Threshold Test Accurately Detect Heart Rate Deflection In Trained Cyclists?, Willie K. Yuen, Shad R. Schreiner, Donald L. Hoover, Janice K. Loudon, Sandra A. Billinger

International Journal of Exercise Science

The Friel Anaerobic Threshold Test (FATT) has been used to determine anaerobic threshold (AT). The FATT suggests AT occurs near the heart rate deflection point (HRDP) at a rating of perceived exertion (RPE) of 17. Purpose: The primary purpose of this study was to determine 1) whether the HRDP could be determined using the FATT, 2) examine differences between HRVT and HR that coincided Borg’s rating of perceived exertion (RPE) of 17, and 3) if riding position (hoods or aero) would influence performance. Methods: Fourteen male cyclists (30.4 ± 7.41years of age; 151.8 ± 60.4 cycled miles/week) participated in the …

Effects Of Xs® Energy Drink On Aerobic Exercise Capacity Of Athletes, Kevin M. Sheehan, Lynn K. Hartzler

International Journal of Exercise Science

A small increase in performance is often the difference between winning and losing for athletes, and energy supplements are marketed to give them a competitive edge. One such supplement is XSAlt 0174 Energy Drink which contains B vitamins, caffeine, taurine, and an herbal adaptogen blend. XSAlt 0174 Energy Drink is primarily designed and marketed as an alertness stimulus; however, it is also marketed to athletes as a performance enhancing supplement. We hypothesized that the consumption of XSAlt 0174 Energy Drink before exercise would increase aerobic capacity (an increase in Vo2max) and time to fatigue, and would decrease time for recovery …

Effects Of A Caffeine-Containing Transdermal Energy Patch On Aerobic And Anaerobic Exercise Performance, Kenneth R. Dragoo, W. Matthew Silvers, Kelly E. Johnson, Eliseo A. Gonzalez

International Journal of Exercise Science

The use of caffeine-containing (74-mg) energy patches (EnP) offers a novel mode of caffeine delivery that may alleviate stomach discomfort associated with oral caffeine use. The purpose of this study was to use four separate tests to evaluate the effects of EnP use on aerobic and anaerobic exercise performance. Three separate moderately active college-aged sample populations performed either 1) cycle time-to-exhaustion, 2) Wingate (WIN), or 3) repeated sprints and one repetition maximum bench press using EnP and placebo patches (PlP). No statistical differences were found between EnP and PlP for all dependent variables (p > 0.05) except for WIN peak power, …

A Description Of Variability Of Pacing In Marathon Distance Running, Tom Haney Jr., John Mercer Dr.

International Journal of Exercise Science

The purpose of this study was twofold: 1) to describe variability of pacing during a marathon and 2) to determine if there is a relationship between variability of pacing and marathon performance. Publically available personal global positioning system profiles from two marathons (Race 1 n = 116, Race 2 n = 169) were downloaded (http://connect.garmin.com) for analysis. The coefficient of variation of velocity (Velcov) was calculated for each profile. Each profile was categorized as finishing in under 3.9 hours, between 3.9 and 4.6 hours, or longer than 4.6 hours. Linear and quadratic lines of best fit were computed to describe …

Knee Osteoarthritis And The Efficacy Of Kinesthesia, Balance & Agility Exercise Training: A Pilot Study, Matthew W. Rogers, Nauris Tamulevicius, Marius F. Coetsee, Beth F. Curry, Stuart J. Semple

International Journal of Exercise Science

Kinesthesia, balance and agility (KBA) neuromuscular exercises are commonly used for rehabilitation of lower extremity injuries. KBA combined with strength training (ST) reportedly improves function among persons with knee osteoarthritis (OA), but independent effects of KBA are unknown. The purpose of this study was to determine the efficacy of KBA exercises, independent of ST, to improve function among persons with knee OA. Twenty participants (69.3, SD 11.4 y) were randomized to 8 weeks, 3-days per week, instructor-lead KBA or ST groups. Self-reported physical function (difficulty with daily living activities such as walking, bending, stair climbing, etc.) was measured at baseline …

The Effect Of Energy Patches On Substrate Utilization In Collegiate Cross-Country Runners, Ryan E. Fiddler, Doug Smith, Bert Jacobson, Crishel Klein, Aric Warren, Matt O'Brien, Brennan Thompson, Lee Everett

International Journal of Exercise Science

It is well established that an increased capacity of skeletal muscle to oxidize fatty acids can spare glycogen and delay the onset of fatigue in mild- to moderate-intensity exercise. The purpose of the following study was to examine the effect of LifeWave® energy patches on non-protein substrate utilization in Division-1 cross-country runners. To determine the effect of the patches subjects were pretested to establish baselines and randomly assigned to an experimental (EX) or placebo (PL) group. Twenty-two trained male (n = 11; mean ± SD, age = 21.1 ± 2.6years, height = 179.6 ± 4.2cm, body mass = 71.4 ± …

Physical Activity And Screen Time Sedentary Behaviors In College Students, Charles J. Fountaine, Gary A. Liguori, Arupendra Mozumdar, John M. Schuna Jr.

International Journal of Exercise Science

It is well established that Americans are not meeting physical activity (PA) guidelines and college students are no exception. Given the lack of regular PA, many health promotion professionals seek to discover what barriers to PA may exist. A common explanation is screen time (ST), which is comprised primarily of television viewing, computer use, and the playing of video games. The purpose of this study was to present descriptive data on college students’ PA and sedentary behavior and to assess if any evidence exists to suggest displacement between sedentary behaviors and PA in college students. Students completed an online health …

Accuracy Of The Omron Hbf-500 Body Composition Monitor In Male And Female College Students, Michael I. Pribyl, John D. Smith, G Richard Grimes

International Journal of Exercise Science

The Omron HBF-500 is an inexpensive body composition monitor that incorporates both hand-to-hand and foot-to-foot electrical impedance technology. At this time, studies examining the accuracy of the HBF-500 when estimating percent body fat (%BF) are scarce and if this instrument gains popularity due to its claimed precision, comparisons against validated techniques should be conducted. The purpose of this study was to assess the accuracy of the Omron HBF-500 body composition monitor using the BOD POD as a criterion. Forty-eight men and 33 women participated in the study (24.3±6.9 years, 171.0±10.0 cm, 78.4±18.0 kg, 26.6±5.1 kg/m2). Participants were asked to refrain …

Child Obesity In Context: Ecology Of Family And Community, Joel E. Williams

International Journal of Exercise Science

Minority and low socioeconomic status groups have the highest rates of overweight and obesity. Children from these families face a greater risk for weight-related health problems such as diabetes, heart disease and cancer as compared to their non-minority and more affluent peers. Factors from the larger physical, social, and cultural environments, and within families, influence weight status among children. Many of these factors are yet to be identified and relationships among known factors are complex and not well understood. The National Institutes of Health and U.S. Department of Agriculture have proposed a research agenda for social and behavioral scientists to …

Neuromuscular Adaptations In Elderly Adults Are Task-Specific During Stepping And Obstacle Clearance Tasks., Matthew Bice, Nicholas J. Hanson, James A. Eldridge, Paul Reneau, Douglas W. Powell

International Journal of Exercise Science

Elderly adults have a diminished movement capacity due to physiological and neurological declines associated with advancing age. Previous research suggests that elderly adults use altered neuromuscular patterns to conduct activities of daily living (ADLs). Limited research has addressed these altered activation strategies in obstacle clearance, stair ascent and stair descent. The purpose of this study was to compare neuromuscular activation patterns in young and elderly adults during these tasks. Eleven young and 10 healthy elderly adults performed five downward stepping, upward stepping and obstacle clearance trials. Surface EMG was measured from the quadriceps, hamstrings, gastrocnemius and tibialis anterior muscles. A …

Effects Of Energy Drinks On Metabolism At Rest And During Submaximal Treadmill Exercise In College Age Males., Janae Nienhueser, Gregory A. Brown, Brandon S. Shaw, Ina Shaw

International Journal of Exercise Science

Energy drinks are widely available and popular among athletes and non-athletes. However, the effects of energy drinks on resting and exercise energy expenditure and metabolism remain largely unknown. On four separate occasions, baseline measurements of resting metabolic rate (RMR) and Respiratory Exchange Ratio (RER) were obtained in ten healthy males (21.4 ± 1.6 y, 77.60± 7.5 kg, 180.0 ± 7.1 cm). Then, in a randomly assigned cross-over design, the subjects consumed 473 ml of one of three commercially available energy drinks or a placebo and then RMR and RER were measured 1 hour later. The subjects then engaged in 15 …

Ankle Spatting Compared To Bracing Or Taping During Maximal-Effort Sprint Drills, Grant D. Reuter, Angela R. Dahl, David S. Senchina

International Journal of Exercise Science

The purpose of this study was to compare the influences of 4 ankle conditions (no support, bracing, taping, taping + spatting; all in football cleats) during 2 maximal-effort field drills (40-yd dash and 34-yd cutting drill) on perceptions of comfort and stability and performance outcomes. Fourteen young adult males participated. Subjects’ perceptions of comfort and stability were assessed by visual analogue scales after each drill for each ankle condition. Time-to-completion and post-completion heart rate were recorded. For both drills, significant differences in comfort perception were found such that subjects perceived no support as equivocal to bracing but more comfortable than …

Cadence, Stride Rate And Stride Length During Triathlon Competition, Grant J. Landers, Brian A. Blanksby, Timothy R. Ackland

International Journal of Exercise Science

Triathlon research shows cycling alters the physiological response of subsequent running but, at present, biomechanical changes are unresolved. This study examined cycling cadence and running stride rate (SR) and length (SL) used by senior elite triathletes during competition. These variables were then compared to running and triathlon performance.

Data from 51 elite male World Championships triathletes were analysed via video recordings and Video Expert II Coach. Triathletes revealed consistent cadences throughout the majority of the cycle (96.8 +2.7 rpm) and run (90.9 +2.4 rpm) disciplines. However, a cadence increase (99.6 +5.7 rpm) was recorded at the completion of the cycle …

Call Accuracy And Distance From The Play: A Study With Brazilian Soccer Referees, Mario Cesar Oliveira, Rogério Orbetelli, Turíbio L. Barros Neto

International Journal of Exercise Science

Refereeing decisions in soccer has always been a controversial issue. In order to better understand this subject, foul calls made by Brazilian soccer referees were evaluated to determine the potential relationship between the distance from the referee to a foul play and the accuracy of the call. Soccer matches supervised by the São Paulo State Football Federation were recorded and 321 foul calls were analyzed. No significant association was found between the referee’s distance from a foul play and accuracy of the call (p = 0.561). However, there was a significant increase in the number of correct calls in the …

Relationship Between Stroking Parameters And Leg Movement Quantity In 100 Metre Front, Andrew Sortwell

International Journal of Exercise Science

The objective of this study was to examine the relationship between stroking technique parameters and leg kick quantity in 100 m front crawl swim. Ten New South Wales Sydney Metropolitan swimmers were examined (14.1 ± 1.09 years). The investigation was performed during 100 metre swimming (average speed 1.35 ± .04 [m.s-1]) commencing from water at 50 m outdoor pool. Stroke length (SL), Stroke rate (SR), Swim velocity (SV), Leg Kick Quantity (LKQ) were measured. Arm stroking parameters and LKQ were analysed during segment of the 100m distance. The relationship between SR and LKQ was negative. The correlation between stroke length …

Analysis Of Heel Raise Exercise With Three Foot Positions, Kimberly J. Arnsdorff, Ken Limbaugh, Bryan L. Riemann

International Journal of Exercise Science

ABSTRACT Prior research revealed activation differences between the medial (MG) and lateral (LG) gastrocnemius when performing heel raise exercise with neutral (N), internally-rotated (IR) and externally-rotated (ER) foot positions. Studying underlying biomechanics may help explain activation differences. The purpose was to compare ankle (AN), knee (KN), and hip (HI) contributions (initial joint angles) to attaining each initial foot position, ankle flexion-extension range of motion, ankle mechanical energy expenditure, repetition time, and percent cycle concentric-eccentric transition between N, IR, and ER foot positions. Twenty healthy subjects (11 male, 9 female) with resistance training experience performed twelve repetitions of free-weight (135% body …