Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 22 of 22
Full-Text Articles in Life Sciences
Prediction Of Maximum Lactate Concentration During An All-Out Anaerobic Test In Elite Ice Hockey Players, Maxime Allisse, Hung Tien Bui, Patrick Desjardins, Philippe Roy, Alain Steve Comtois, Mario Leone
Prediction Of Maximum Lactate Concentration During An All-Out Anaerobic Test In Elite Ice Hockey Players, Maxime Allisse, Hung Tien Bui, Patrick Desjardins, Philippe Roy, Alain Steve Comtois, Mario Leone
International Journal of Exercise Science
International Journal of Exercise Science 16(4) 1385-1397, 2023. The lack of specific on-ice tests to predict maximum lactate concentration limits the ability of coaches to better track and develop their ice hockey players. Thus, this study aimed to develop an equation for indirectly assessing the maximum lactate concentration produced from an all-out on-ice skating effort in elite adolescent ice hockey players. Twenty elite male ice hockey players participated in this study (age = 15.7 ± 1.0 year). The lactate anaerobic skating test (LAST) consisted of skating back and forth on an 18.2 m course at maximal speed with abrupt stops …
A Comparison Of Anaerobic Power Tests Using Cycle Ergometry And Non-Motorized Treadmill Ergometry At Optimized Loads, Cherilyn N. Mclester, Rasmus Rooks, John R. Mclester, Emily Bechke, Cassie M. Williamson-Reisdorph, Brian Kliszczewicz
A Comparison Of Anaerobic Power Tests Using Cycle Ergometry And Non-Motorized Treadmill Ergometry At Optimized Loads, Cherilyn N. Mclester, Rasmus Rooks, John R. Mclester, Emily Bechke, Cassie M. Williamson-Reisdorph, Brian Kliszczewicz
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 1293-1305, 2023. The purpose of this study was to compare performance markers derived from a 30-second maximal bout on a cycle ergometer (CE) and non-motorized treadmill (NMT) under optimized loads. Recreationally active participants (n = 40) volunteered for the study. Force-velocity tests on the CE and NMT were used to determine optimal resistance for peak power (PP) production. The remaining visits were randomized and counterbalanced, with a single 30-second maximal test on CE or NMT to assess PP, mean power (MP), fatigue index (FI), over the course of the 30-second test, and maximum heart …
A Vo2max Protocol For Young, Apparently Healthy Adults, Griffin Green, Whitley J. Stone, Danilo Tolusso, Mark A. Schafer, Scott Lyons
A Vo2max Protocol For Young, Apparently Healthy Adults, Griffin Green, Whitley J. Stone, Danilo Tolusso, Mark A. Schafer, Scott Lyons
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 1257-1268, 2023. The Bruce and Astrand treadmill protocols are commonly utilized when assessing maximal oxygen consumption (VO2max). However, the steep grade implemented in the protocols often leads to localized muscular fatigue, potentially causing participants prematurely to terminate the test prior to reaching their true VO2max. The purpose of this study was to evaluate a Novel VO2max protocol that may be better suited for young, apparently healthy populations. The Novel protocol starts at a higher speed and lower initial grade to limit lower extremity fatigue. Fifteen participants performed the Bruce, …
Sex Differences And Physical Activity Status On The Hamstring: Quadriceps Ratio, Activities Of Daily Living, And Functional Movement In Older Adults, Brittany N. Followay, Haley A. Reierson, Emily M. Rigden
Sex Differences And Physical Activity Status On The Hamstring: Quadriceps Ratio, Activities Of Daily Living, And Functional Movement In Older Adults, Brittany N. Followay, Haley A. Reierson, Emily M. Rigden
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 1228-1243, 2023. The study aimed to investigate sex differences and the effect of physical activity on the hamstring:quadriceps (H:Q) ratio, activities of daily living (ADLs), and the Functional Movement Screen (FMS) in older adults. Thirty older adults (72.56 + 6.22) completed maximal voluntary isometric contractions (MVICs), ADLs, the FMS, and three closed-kinetic chain exercises (CKCs); front lunge (FL), side lunge (SL), and bilateral squat (BLSQ). Electromyography was recorded from the biceps femoris (BF) and vastus lateralis (VL) on the dominant and non-dominant limbs during the MVICs …
Trunk Muscle Thickness During Supine And Crawling Exercises, Fumiya Ando, Tsubasa Terashima, Hiroto Takahashi, Honoka Kurita, Ayaka Takayama, Yoshiaki Endo
Trunk Muscle Thickness During Supine And Crawling Exercises, Fumiya Ando, Tsubasa Terashima, Hiroto Takahashi, Honoka Kurita, Ayaka Takayama, Yoshiaki Endo
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 1103-1112, 2023. The purpose of this study was to measure and validate trunk muscle thickness while performing the Heel Off (HO-ex) and Bird Dog exercises (BD-ex), which are hip extension exercises in the supine position. Thirty-one healthy young males who provided informed consent were included in the study. The thicknesses of the right trunk muscles (lumbar multifidus (LM), erector spinae (ES), external oblique (EO), internal oblique (IO), and transverse abdominis (TrA) were measured using an ultrasound machine. Measurements were taken under four random conditions: supine, HO-ex, crawling on all fours, and BD-ex. One-way analysis …
The Impact Of Gloves And Occupational Tasks On Handgrip Strength In Structural Firefighters, Sarah N. Lanham, Emily L. Langford, Haresh Rochani, Bridget F. Melton, Stephen J. Rossi, Mark Abel
The Impact Of Gloves And Occupational Tasks On Handgrip Strength In Structural Firefighters, Sarah N. Lanham, Emily L. Langford, Haresh Rochani, Bridget F. Melton, Stephen J. Rossi, Mark Abel
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 1087-1102, 2023. Adequate handgrip strength (HGS) is important to safely perform fireground tasks. However, there is limited research describing the deleterious impact of glove use and fatigue from occupational tasks on HGS. Therefore, the aims of this investigation were to quantify the impact of glove use and occupational tasks on HGS, to explore the relationship between HGS versus the glove and task-induced decrement in HGS, and to evaluate the relationship between HGS and decrement in HGS versus occupational performance. Fourteen (Male: n = 13) career structural firefighters (Age: 35.5 ± 7.2 yr) performed a …
Effects Of 3 Weeks Yogic Breathing Techniques On Sub-Maximal Running Responses, Christie L. Clifton, Lauren Killen, Matt Green, Eric O'Neal, Jonathan C. Swain, Christopher Frisbie
Effects Of 3 Weeks Yogic Breathing Techniques On Sub-Maximal Running Responses, Christie L. Clifton, Lauren Killen, Matt Green, Eric O'Neal, Jonathan C. Swain, Christopher Frisbie
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 1066-1076, 2023. This study investigated the influence of yoga breathing techniques (YBT) on physiological and perceptual responses during sub-maximal treadmill running. Runners (n = 21) of various fitness (VO2max 48.4 ± 9.5 ml/kg/min) were assigned to Yoga (YG) or control (CT) group before completing pre/post treadmill trials where velocity was self-selected to produce an RPE 4 and RPE 7 (10 min each). YG (n =11) practiced three styles of YBT (30 min/day, 6 days/wk) for 3 consecutive wks. Self-selected running velocity for YG improved significantly at both prescribed RPE 4 (pre 157.63 ± 26.20 …
Identifying Consistent Metrics From The Force-Time Curve Of The Countermovement Jump In Combat Fighters And Physically Active Men., Alexandre Reis Pires Ferreira, Victor Macedo, Daniel Boullosa, Amilton Vieira
Identifying Consistent Metrics From The Force-Time Curve Of The Countermovement Jump In Combat Fighters And Physically Active Men., Alexandre Reis Pires Ferreira, Victor Macedo, Daniel Boullosa, Amilton Vieira
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 1038-1051, 2023. We investigated the consistency of metrics obtained from the unweighting, braking, propulsive, and landing phases of the countermovement (CMJ) force-time curve in combat fighters and physically active men. Combat fighters (n=21) and physically actives (n=21) were tested for three days (2-7 days apart). Participants performed four maximal CMJ separated by 1-min for between-day comparisons. From force-time recording, the consistency of 16 CMJ metrics (peak and mean ground reaction forces (GRF), net impulse, and duration from each phase) was investigated using the intraclass correlation coefficient (ICC) and typical error (CVTE). We …
Physical Profile Of Air Force Special Warfare Trainees, Kim A. Feeney, Bridget F. Melton, Helen W. Bland, Greg A. Ryan, Cody R. Butler
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
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 …
Mas And Mans Predicts Repeated Sprint Ability In Youth Soccer Players, Jørgen D. Olsen, Henrik R. Rognhaug, Daniel Kvamme, Øyvind Støren, Eva Maria Støa
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 (VO2max), oxygen cost of running (Cr), RSA consisting of 15×20m sprint each divided by a 100 seconds dribble track, and 40-meter sprint performance. MAS was calculated as VO2max × Cr −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
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 VO2peak 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 …
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
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 …
Reliability Of Time To Exhaustion Above The Power Output At Vo2peak In Trained Mountain Bikers, Allan Inoue, Eduardo Lattari, Everton Carmo, Bruno Oliveira, Elirez Silva, Tony Santos
Reliability Of Time To Exhaustion Above The Power Output At Vo2peak In Trained Mountain Bikers, Allan Inoue, Eduardo Lattari, Everton Carmo, Bruno Oliveira, Elirez Silva, Tony Santos
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 654-664, 2023. To our knowledge, no study has investigated the reliability of the time to exhaustion (TTE) test during constant-load trials in Olympic distance cross-country mountain bike (XCO-MTB) athletes. Thus, the aim was to analyze the reliability of the TTE test at intensities above peak oxygen uptake (VO2peak) in trained XCO-MTB athletes. Fifteen male XCO-MTB athletes (mean ± SD: age 31.5 ± 6.6 years, stature 174.0 ± 5.4 cm, body mass 67.2 ± 5.1 kg, VO2peak 64.5 ± 4.7 mL∙kg-1∙min-1) completed 2 TTE tests on the cycle …
Comparison Of A Ramp Cycle Ergometer And A Staged Assault Fitness Assaultbike Protocol For The Assessment Of Vo2max, Regis C. Pearson, Sara A. Garcia, Nathan T. Jenkins
Comparison Of A Ramp Cycle Ergometer And A Staged Assault Fitness Assaultbike Protocol For The Assessment Of Vo2max, Regis C. Pearson, Sara A. Garcia, Nathan T. Jenkins
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 613-619, 2023. We propose a new VO2max test using a progressive staged protocol on an Assault Fitness AssaultBike. Twelve healthy males performed a traditional ramp cycle ergometer test (TRAD) and a progressively staged AssaultBike protocol (AB) in a counterbalanced order. AB elicited higher immediate post-exercise lactate, absolute and relative VO2max, and maximum heart rate than TRAD (P = 0.006, P = 0.014, P = 0.007, and P = 0.001, respectively). The protocol outlined herein may provide a more accurate assessment of VO2max due to greater skeletal muscle mass recruitment that is more representative …
The Relationship Between Muscular Strength, Jump Power, And Bone Health In Collegiate Distance Runners, Daisy E. Huerta, Jarred M. Norris, William P. Mccormack, Todd C. Shoepe, Hawley C. Almstedt
The Relationship Between Muscular Strength, Jump Power, And Bone Health In Collegiate Distance Runners, Daisy E. Huerta, Jarred M. Norris, William P. Mccormack, Todd C. Shoepe, Hawley C. Almstedt
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 563-575, 2023. Participation in sports, especially those involving impact loading, enhance bone mineral content (BMC) and density (BMD). Additionally, participation in impact loading sports may strengthen relationships between strength or power and bone variables. The purpose of this investigation was to examine relationships between measures of muscular performance and bone variables in Division I endurance athletes (29 males, 31 females, 19.6 ± 1.4 years). Dual-energy x-ray absorptiometry (DXA) scans were analyzed at the anterior-posterior (AP) and lateral (LAT) spine, femoral neck (FN), total hip (TH), whole body (WB), and ultra-distal forearm (UD) for BMC …
Low-Load X High-Load Resistance Exercise: Greater Cell Swelling After A Training Session, Gabriel Agentilho, Erick Lucena, Luis Felipe M. Teixeira, Vanessa Boas, Isadora Ribeiro, Renato Barroso, Brad Schoenfeld, Marco Uchida
Low-Load X High-Load Resistance Exercise: Greater Cell Swelling After A Training Session, Gabriel Agentilho, Erick Lucena, Luis Felipe M. Teixeira, Vanessa Boas, Isadora Ribeiro, Renato Barroso, Brad Schoenfeld, Marco Uchida
International Journal of Exercise Science
International Journal of Exercise Science 16(3): 513-524, 2023. Cell swelling caused by resistance training is proposed to provide an anabolic stimulus for muscle growth and it is believed that these effects are heightened with the use of low loads. The purpose of this study was to compare the acute effects of two volume-equated resistance training (RT) protocols, low-load (LL) versus high-load (HL), on elbow flexor muscles thickness, arm circumference, and blood lactate concentration in well-trained individuals. Eight resistance-trained males performed the following two RT protocols involving unilateral elbow flexion of the dominant arm: i) LL, four sets with 50% 1 …
Reliability Of A Novel Automated Ultrasound Technology For Body Composition Assessment And Comparisons With Dual Energy X-Ray Absorptiometry, Adam Bradley, Lukus Klawitter, Emma Carver, Zach Johnson, Ryan Mcgrath, Sherri Stastny, Bryan Christensen, Kyle Hackney
Reliability Of A Novel Automated Ultrasound Technology For Body Composition Assessment And Comparisons With Dual Energy X-Ray Absorptiometry, Adam Bradley, Lukus Klawitter, Emma Carver, Zach Johnson, Ryan Mcgrath, Sherri Stastny, Bryan Christensen, Kyle Hackney
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 393-401, 2023. Body composition tools vary in reliability, portability, and accessibility. The purpose of this study was to evaluate test-retest reliability of MuscleSound® (MS) and dual-energy x-ray absorptiometry (DXA) for both two compartment (region) and three compartment (tissue) models. A secondary aim was to compare body composition values produced by both devices. Fifty participants (n = 25 male, n = 25 female) aged 18-39 years completed two body composition assessments, twice in a single session. Participants arrived at the lab after a 12-hour fast. DXA required participants to lay supine for 10-15 minutes …
Ischemic Preconditioning Improves The Bench-Press Maximal Strength In Resistance-Trained Men, Anderson Luiz Rodrigues, Bernardo N. Ide Dr., Jeffer Eidi Sasaki, Donizete Cicero X. De Oliveira Oliveira, Claudio De Oliveira Assumpção, Moacir Marocolo, Gustavo Mota
Ischemic Preconditioning Improves The Bench-Press Maximal Strength In Resistance-Trained Men, Anderson Luiz Rodrigues, Bernardo N. Ide Dr., Jeffer Eidi Sasaki, Donizete Cicero X. De Oliveira Oliveira, Claudio De Oliveira Assumpção, Moacir Marocolo, Gustavo Mota
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 217-229, 2023. We investigated whether acute ischemic preconditioning (IPC) would affect upper limb maximal strength performance in resistance-trained men. Using a counterbalanced randomized crossover design, fifteen men (29.9 ± 5.9 yrs.; 86.3 ± 9.6 kg; 8.0 ± 5.0 yrs. resistance training experience) performed one-repetition maximum (1-RM) bench press tests on three different occasions: control, 10 min post-IPC or 10 min post-placebo (SHAM). One-way analysis of variance showed that the post-IPC condition increased (P < 0.0001) 1-RM loads compared to both control and post-SHAM (control 113.3 ± 15.9 kg vs. SHAM 113.9 ± 15.8 kg vs. IPC 115.7 ± 15.6 kg), while control and SHAM did not differ (P > 0.05). Individual results showed that 13 participants (~87%) improved their performance post-IPC compared to control, and 11 participants (~73%) …
Interrater, Test-Retest Reliability Of The Y Balance Test. A Reliability Study Including 51 Healthy Participants, Frederik Nicolai Foldager, Sofie Louise Aslerin, Sarah Bækdal, Lisa Urup Tønning, Inger Mechlenburg
Interrater, Test-Retest Reliability Of The Y Balance Test. A Reliability Study Including 51 Healthy Participants, Frederik Nicolai Foldager, Sofie Louise Aslerin, Sarah Bækdal, Lisa Urup Tønning, Inger Mechlenburg
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 182-192, 2023. The aim was to determine the relative and absolute interrater, test-retest reliability of the Y-Balance Test (YBT) in a sample of healthy and active adults aged 18 to 50 years. The sample consisted of 51 healthy and active participants, 30 men and 21 women with a mean age of 28 ± 7 years. The YBT was performed on the right leg in the three test directions. Test and retest of the YBT were performed with a median interval of 15 days. The method for data collection was in line with the Y …
The Relationship Between Health And Movement Screens And Field-Based Physical Fitness Tests In Reserve Officer Training Corps Students, Lukas Krumpl, Nickolai J. P. Martonick, Youngmin Chun, Ann F. Brown, Joshua P. Bailey
The Relationship Between Health And Movement Screens And Field-Based Physical Fitness Tests In Reserve Officer Training Corps Students, Lukas Krumpl, Nickolai J. P. Martonick, Youngmin Chun, Ann F. Brown, Joshua P. Bailey
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 42-52, 2023. The purpose of the present study was to evaluate the relationship between scores achieved in physical fitness tests and outcomes of health and movement screens (HMS) in ROTC students. Twenty-eight students (20 males: 21.8 yrs [± 3.4] & 8 females: 20.7 yrs [± 1.8]) enrolled in an ROTC branch (Army, Air Force, Navy, or Marines) completed a series of screens, including body composition analysis via Dual-Energy X-Ray Absorptiometry (DXA), balance and functional movement tasks via a lower-quarter Y-Balance test, and knee and hip joint concentric strength testing on an isokinetic dynamometer. Official …
Prediction Of Rowing Functional Threshold Power Using Body Mass, Blood Lactate And Gxt Peak Power Data., Eanna Mc Grath, Bernard Donne, Nicholas Mahony, Neil Fleming
Prediction Of Rowing Functional Threshold Power Using Body Mass, Blood Lactate And Gxt Peak Power Data., Eanna Mc Grath, Bernard Donne, Nicholas Mahony, Neil Fleming
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 31-41, 2023. Functional Threshold Power (FTP) is a validated index of a maximal quasi steady-state cycling intensity. The central component of the FTP test is a maximal 20-min time-trial effort. A model to predict FTP from a cycling graded exercise test (m-FTP) was published that estimated FTP without the requirement of the exhaustive 20-min time-trial. The predictive model (m-FTP) was trained (developed to find the best combination of weights and bias) on a homogenous group of highly-trained cyclists and triathletes. This investigation appraised the external validity of the m-FTP model vis-à-vis the alternate modality …