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Full-Text Articles in Physiology
Influence Of Physical Activity Including Squat Exposure On Trunk Muscle Strength And Labour Outcome In Pregnant Women, Rajal Savla, Rajani Mullerpatan, Bela Agarwal, Victoria Kuttan, Sushil Kumar
Influence Of Physical Activity Including Squat Exposure On Trunk Muscle Strength And Labour Outcome In Pregnant Women, Rajal Savla, Rajani Mullerpatan, Bela Agarwal, Victoria Kuttan, Sushil Kumar
International Journal of Exercise Science
International Journal of Exercise Science 17(1): 504-516, 2024. Daily living physical activities of rural pregnant women, across most continents in the world, involve adoption of high-flexion postures like deep-squat. Deep-squat elicits substantial activation of major trunk and lower extremity muscles. Adequate strength of trunk muscles is known to facilitate forward-downward propulsion of baby during labour. Therefore, current study aimed to explore influence of overall physical activity including squat exposure on trunk and lower-extremity muscle strength and labour outcomes in rural and urban primigravida women. Twenty-eight primi-gravida women were stratified into 2 groups: rural habitual-squatters (n=14) and urban non-squatters (n=14). Daily …
The Quantification Of Muscle Activation During The Loaded Carry Movement Pattern, Samuel H. Ellestad, Thomas P. Holcomb, Alexis M. Swiergol, Michael E. Holmstrup Phd, Jeremy R. Dicus
The Quantification Of Muscle Activation During The Loaded Carry Movement Pattern, Samuel H. Ellestad, Thomas P. Holcomb, Alexis M. Swiergol, Michael E. Holmstrup Phd, Jeremy R. Dicus
International Journal of Exercise Science
International Journal of Exercise Science 17(1): 480-490, 2024. The ‘loaded carry’ is a popular resistance training activity that activates core musculature across multiple movement planes while the body is in locomotion. ‘Hold’ exercises are similar to carry exercises but lack the locomotive aspect. Both carry and hold exercises can be completed bilaterally (farmer’s carry (FC) and hold (FH)) or unilaterally (suitcase carry (SC) and hold (SH)). A deeper understanding of muscle activation between the FC and SC and intensity-matched FH and SH might improve their application. Healthy, college-aged individuals were recruited and surface electromyography of the rectus abdominis (RA), external …
Acute Effects Of A Hop-Stabilization Warm-Up Program On Dynamic Balance, Ground Reaction Force, And Muscle Activity During Cutting Movements In Collegiate Athletes With Chronic Ankle Instability, Teerapat Laddawong, Hiromi Saito, Toshiaki Soga, Hirose Norikazu
Acute Effects Of A Hop-Stabilization Warm-Up Program On Dynamic Balance, Ground Reaction Force, And Muscle Activity During Cutting Movements In Collegiate Athletes With Chronic Ankle Instability, Teerapat Laddawong, Hiromi Saito, Toshiaki Soga, Hirose Norikazu
International Journal of Exercise Science
International Journal of Exercise Science 17(1): 343-358, 2024. First-time lateral ankle sprains often lead to chronic ankle instability (CAI), with 47% facing recurrent injuries, emphasizing the need for preventive measures. Side-cutting movements in sports pose a risk for CAI individuals due to potential biomechanical control alterations. While the hop-stabilization warm-up program has proven effective in preventing ankle sprains, its specific acute impact on CAI individuals lacks substantial evidence. This study employed a crossover design with eight CAI participants (23 ± 3.4 years, BMI 23 ± 1.5 kg/m2) and eight healthy participants (25 ± 3.6 years, BMI 23 ± …
Acute Effects In Postural Sway As A Result Of Self-Myofascial Release On The Lower Extremities In Collegiate Female Athletes., Mackenzie Melton, Andrew Shim, Monica Dial, Guilherme M. Cesar
Acute Effects In Postural Sway As A Result Of Self-Myofascial Release On The Lower Extremities In Collegiate Female Athletes., Mackenzie Melton, Andrew Shim, Monica Dial, Guilherme M. Cesar
International Journal of Exercise Science
International Journal of Exercise Science 17(1): 274-284, 2024. Myofascial release is a popular therapy technique used to manipulate connective muscle tissue to become more pliable. The maintenance of body posture relies on mechanoreceptors located in connective tissue, thus manipulation of connective tissue should affect postural control. The effects of this phenomenon have not been well studied, leaving room for this investigation. PURPOSE: To observe if postural sway scores changed before and after foam rolling proximal (quadriceps and hamstrings) in comparison to distal (calves) muscles. METHODS: Thirty-six, college-aged female athletes (age 20.39 ± 0.25 years, mass 68.70 ± 1.97 kg, height …
Evaluation Of The Craniovertebral Angle In Standing Versus Sitting Positions In Young Adults With And Without Severe Forward Head Posture, David A. Titcomb, Bridget F. Melton, Helen W. Bland, Theresa Miyashita
Evaluation Of The Craniovertebral Angle In Standing Versus Sitting Positions In Young Adults With And Without Severe Forward Head Posture, David A. Titcomb, Bridget F. Melton, Helen W. Bland, Theresa Miyashita
International Journal of Exercise Science
International Journal of Exercise Science 17(1): 73-85, 2024. The purpose of this study was to examine the effects of standing versus sitting body position on the craniovertebral angle (CVA) in young adults without pathology; and to investigate whether mean differences between positional CVA measures in subjects with severe forward head posture (FHP) are distinct from age-matched controls with normal head posture. Ninety-eight young adults (68 women, 30 men) without pathology (OVERALL; n = 98) volunteered for the study; those with CVA > 53° were also included in a normal posture group (NORM; n = 14); those with CVA < 45° were also included in a severe FHP group (SEV; n = 15). …
Bench Press Range-Of-Motion And Velocity-Based Repetition Control: Effects On Ballistic Push-Up Performance In Males, Kyle Collins, Adam Bradley, Bryan Christensen, Roman Waldera, Lukus Klawitter, Liam Ogren, Robert Salatto
Bench Press Range-Of-Motion And Velocity-Based Repetition Control: Effects On Ballistic Push-Up Performance In Males, Kyle Collins, Adam Bradley, Bryan Christensen, Roman Waldera, Lukus Klawitter, Liam Ogren, Robert Salatto
International Journal of Exercise Science
International Journal of Exercise Science 17(1): 38-53, 2024. The purpose of this study was to investigate whether the ballistic push-up (BPU) is responsive to post-activation performance enhancement (PAPE) after a bench press conditioning exercise using velocity-based repetition control. Additionally, we aimed to evaluate the effects of range of motion (ROM) conditions on subsequent BPU performance. In a randomized crossover design, 18 males performed two conditions (full ROM and self-selected partial ROM) of bench press at 80% of their 1RM until mean concentric velocity dropped 10%. Each participant performed two pre- and six post-test BPUs to assess the PAPE effect. Paired …
The Effects Of Wearing A Portable Media Armband On Muscle Activation Of The Biceps Brachii, W. Steven Tucker, Melissa J. Allen, Ashley E. Patterson, Alex W. Fotioo
The Effects Of Wearing A Portable Media Armband On Muscle Activation Of The Biceps Brachii, W. Steven Tucker, Melissa J. Allen, Ashley E. Patterson, Alex W. Fotioo
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 1461-1470, 2023. Portable media armbands are commonly used among the physically active population. Their effect on muscle function has not been established. The purpose of this study was to determine if muscle activation of the biceps brachii is influenced by wearing a portable media armband during an elbow flexion exercise. Eighteen participants (11 males: age = 22.5 ± 2.1 years, height = 178.3 ± 5.2 cm, mass = 85.0 ± 6.5 kg; 7 females: age = 22.9 ± 2.5 years, height = 168.3 ± 5.7 cm, mass = 72.3 ± 12.2 kg) with no …
Comparison Of Muscle Activity During A Ring Muscle Up And A Bar Muscle Up, Cody W. Walker, Adam J. Bruenger, W. Steven Tucker, Hyung Rock Lee
Comparison Of Muscle Activity During A Ring Muscle Up And A Bar Muscle Up, Cody W. Walker, Adam J. Bruenger, W. Steven Tucker, Hyung Rock Lee
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 1451-1460, 2023. The muscle up (MU) is a variation of a common gymnastics movement that combines a pull up and a dip. It can be performed on a bar (BMU) or a set of rings (RMU). The difference in upper extremity muscle recruitment (MR) between BMU and RMU has not been evaluated. Therefore, the purpose of this study was to compare the MR of select muscles during BMU and RMU. Ten active males (27.6 ± 7.9 years) performed 5 repetitions of BMU and RMU in randomized order. Muscle recruitment of the upper (UT) and …
A Comparison Of Morphological, Jump, And Sprint Kinematic Asymmetries In Division I Track And Field Athletes, Matthew P. Gonzalez, Samuel Montalvo, Martin Dietze-Hermosa, Manuel Gomez, Sandor Dorgo
A Comparison Of Morphological, Jump, And Sprint Kinematic Asymmetries In Division I Track And Field Athletes, Matthew P. Gonzalez, Samuel Montalvo, Martin Dietze-Hermosa, Manuel Gomez, Sandor Dorgo
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 1306-1319, 2023. Inter-limb asymmetries are the difference in performance in one limb with respect to the other. Running events in track and field are considered symmetrical while jumping and throwing events are considered asymmetrical. It is unknown if competing in these different events result in differences in inter-limb asymmetries, thus, this study compared the magnitude of jump, sprint, and morphological asymmetries in track and field athletes who compete in symmetrical and asymmetrical events. Forty-six Division I track and field athletes performed a series of vertical jumps (VJ) and broad jumps (BJ) with force platforms …
Diagnostic Ultrasound Shows Preferential Activation Of Rectus Abdominis Segments With Exercises Targeting Upper Versus Lower Segments., Aaron P. Gomirato, Sylvain G. Grenier
Diagnostic Ultrasound Shows Preferential Activation Of Rectus Abdominis Segments With Exercises Targeting Upper Versus Lower Segments., Aaron P. Gomirato, Sylvain G. Grenier
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 1077-1086, 2023. Preferential activation of rectus abdominis sections during crunch or leg lifts has long been disputed. The objectives of this study were to both explore the activation of the rectus abdominis during these exercises. This study used a randomised independent measures design utilising both EMG and diagnostic ultrasound to record changes in rectus abdominis activity. Fifteen participants each performed multiple repetitions of a 45° crunch, a 90° sit-up, and finally a 90° leg raise, sufficient for an 8-second ultrasound recording utilising M-mode of all four unilateral abdominal segments during each of the exercises, …
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
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
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 …
Immediate Effect Of Gluteus Medius Kinesio-Taping On Plantar Pressure Distribution And Balance Among Healthy Individuals, Deepa Shekar, Hemant K. Kalyan, Prem Venkatesan, Nithin Prakash, Karvannan Harikesavan
Immediate Effect Of Gluteus Medius Kinesio-Taping On Plantar Pressure Distribution And Balance Among Healthy Individuals, Deepa Shekar, Hemant K. Kalyan, Prem Venkatesan, Nithin Prakash, Karvannan Harikesavan
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 587-598, 2023. Gluteus medius eccentrically regulates hip adduction and internal rotation in unilateral postures against gravity. Any weakness to Gluteus medius can lead to poor posture, impaired balance and altered plantar pressure. There is a scarcity of literature to find the immediate effect of gluteus medius kinesio-taping on plantar pressure distribution and balance among healthy individuals. A Randomized cross-over trial was conducted in outpatient physiotherapy department of Manipal Hospitals Bangalore, on 28 healthy individuals from March 2021 to April 2022. The taping was done on the dominant leg of the subjects, with no tape, …
Effect Of Neuromuscular Electrical Stimulation Training On Control Of Involuntary Muscular Torque And Stimulation Intensity In Older Adults, Kyndall P. Ramirez, Nigel C. Jiwan, Joni A. Mettler Ph.D
Effect Of Neuromuscular Electrical Stimulation Training On Control Of Involuntary Muscular Torque And Stimulation Intensity In Older Adults, Kyndall P. Ramirez, Nigel C. Jiwan, Joni A. Mettler Ph.D
International Journal of Exercise Science
International Journal of Exercise Science 16(3): 482-496, 2023. The purpose of this study was to examine the effects of a 4-week neuromuscular electrical stimulation (NMES) training regimen on involuntary torque output and electrical stimulation intensity in older adults. Twelve older adults (ages: 68.4 ± 6.5 years; men: n = 6, women: n = 6; weight: 158.6 ± 27.3 lbs; height: 65.2 ± 2.1 in) received submaximal intensity NMES to the quadriceps for 4 weeks to determine training-related changes in stimulation intensity and involuntary control of muscular torque during the NMES protocol. Two-way repeated measures ANOVAs were used to compare torque …
Anthropometric Predictors Of Conventional Deadlift Kinematics And Kinetics: A Preliminary Study, Dale S. Keith, Daniel Scherrer, Brandon Nunley, Jake R. Boykin, Jacob J. Green, Madelin R. Siedler, Christian Rodriguez, Patrick S. Harty, Matthew T. Stratton, John R. Harry, Grant M. Tinsley
Anthropometric Predictors Of Conventional Deadlift Kinematics And Kinetics: A Preliminary Study, Dale S. Keith, Daniel Scherrer, Brandon Nunley, Jake R. Boykin, Jacob J. Green, Madelin R. Siedler, Christian Rodriguez, Patrick S. Harty, Matthew T. Stratton, John R. Harry, Grant M. Tinsley
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 429-447, 2023. The purpose of this preliminary analysis was to determine if there are relationships between anthropometric characteristics (arm length, torso length, thigh length, and shank length) and conventional deadlift (CDL) kinematics and kinetics during a 5 sets of 5 repetitions (5 x 5) CDL routine in resistance-trained males. Eleven males who had experience with the deadlift exercise were included in this analysis (age: 21.5 ± 1.4 y; height: 180.7 ± 5.7 cm; body mass: 89.9 ± 16.0 kg). Anthropometrics were measured by a 3-dimensional optical scanner. The participants underwent a 5 x 5 …
Assessment Of Neuromuscular Fatigue 24 Hours After A Futsal Simulated Protocol In University Athletes, Cristian Andres Yanez Msc, Nestor Ochoa Msc, Luis Cardozo Msc, Jhonatan Peña Msc, Laura Nathalia Díaz Lnd, William Ojeda Wo, Jaime Rodriguez Jr
Assessment Of Neuromuscular Fatigue 24 Hours After A Futsal Simulated Protocol In University Athletes, Cristian Andres Yanez Msc, Nestor Ochoa Msc, Luis Cardozo Msc, Jhonatan Peña Msc, Laura Nathalia Díaz Lnd, William Ojeda Wo, Jaime Rodriguez Jr
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 205-216, 2023. The purpose of this study was to identify changes in neuromuscular performance variables evaluated through the countermovement jump test before and after (0 hours, after session and 24h post) of a simulated futsal protocol in young university female athletes. Fourteen eumenorrheic, healthy and experienced female futsal players were randomly assigned to an intervention group n = 7) or a control group (n = 7). Both groups performed three countermovement jumps before and after the protocol using an inertial system device. The intervention group completed a short-term functional agility and fatigue protocol that …
Shoulder Muscle Activity While Swimming In Different Wetsuits And Across Different Paces, Boram Lim, Alina P. Swafford, Katelyn E. Conroy, John A. Mercer
Shoulder Muscle Activity While Swimming In Different Wetsuits And Across Different Paces, Boram Lim, Alina P. Swafford, Katelyn E. Conroy, John A. Mercer
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 172-181, 2023. A triathlon wetsuit is an important piece of equipment during the swim portion of the triathlon for the benefits of thermoregulation and additional buoyancy. However, a lack of knowledge exists about whether or not shoulder muscle activity is influenced by wearing a wetsuit. The purpose of this study was to determine if there were changes in shoulder muscle activity during front crawl with four different wetsuit conditions: Full sleeve (FSW), Sleeveless (SLW), Buoyancy shorts (BS), No wetsuit (NWS) in three different subjective swimming paces (slow, medium, and fast). Eight subjects (5 males, …
Two-Year Injury Incidence And Movement Characteristics Among Division-I Cross-Country Athletes, Kristyne Wiegand, Richard Tandy, Julia Freedman Silvernail
Two-Year Injury Incidence And Movement Characteristics Among Division-I Cross-Country Athletes, Kristyne Wiegand, Richard Tandy, Julia Freedman Silvernail
International Journal of Exercise Science
International Journal of Exercise Science 16(1): 159-171, 2023. While research on running injuries is common, there is a lack of definitive causal relationships between running injuries and gait mechanics. Additionally, there is a paucity of longitudinal research to understand the development of running injuries. The purpose of this study was to assess the incidence of running injuries and investigate movement characteristics as they relate to injury development in Division-I cross-country athletes over a two-year period. Athletes were evaluated at pre- and post-season with three-dimensional kinematic and kinetic gait analyses. A total of 17 female athletes were evaluated, though sample size …
A Comparison Of Muscle Recruitment Across Three Straight-Legged, Hinge-Pattern Resistance Training Exercises, Jeremy R. Dicus, Samuel H. Ellestad, Jesse E. Sheaffer, Carol A. Weber, Noah C. Novak, Michael E. Holmstrup
A Comparison Of Muscle Recruitment Across Three Straight-Legged, Hinge-Pattern Resistance Training Exercises, Jeremy R. Dicus, Samuel H. Ellestad, Jesse E. Sheaffer, Carol A. Weber, Noah C. Novak, Michael E. Holmstrup
International Journal of Exercise Science
International Journal of Exercise Science 16(4): 12-22, 2023. Hinge exercises are critical to building a balanced resistance training program in concert with ‘knee-dominant’ (e.g., squat, lunge) exercises. Biomechanical differences between various straight-legged hinge (SLH) exercises may alter muscle activation. For example, a Romanian deadlift (RDL) is a closed-chain SLH, while a reverse hyperextension (RH) is open-chain. Likewise, the RDL offers resistance via gravity while the cable pull-through (CP) offers redirected-resistance through a pulley. A deeper understanding of the potential impact of these biomechanical differences between these exercises may improve their application to specific goals. Participants completed repetition-maximum (RM) testing on …
Is There A Relationship Between Foot Reaction Time And Ankle Frontal Plane Torque In Female Soccer Athletes: A Pilot Study., Maggie Feehan, Andrew Shim, Guilherme M. Cesar, Amy Burggraff
Is There A Relationship Between Foot Reaction Time And Ankle Frontal Plane Torque In Female Soccer Athletes: A Pilot Study., Maggie Feehan, Andrew Shim, Guilherme M. Cesar, Amy Burggraff
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 1506-1513, 2022. The purpose of this study was to determine if a relationship existed between foot reaction time and ankle frontal plane peak torque in female soccer athletes. A one-shot case study design was selected for this investigation. Seventeen female college athletes volunteered to participate. Right and left foot reaction time measurements were assessed using 3x4 switch mats interfaced with a precise timing counter. Participants stood in front of the mat with eyes closed and responded to the auditory stimulus by touching the mat as fast as possible with their foot. Two trials were …
The Triple Step In Recreational Swing Dancers: A Kinematic Analysis, Meredith D. Wells, Feng Yang
The Triple Step In Recreational Swing Dancers: A Kinematic Analysis, Meredith D. Wells, Feng Yang
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 1492-1505, 2022. Swing dancing is gaining popularity, yet our biomechanical understanding of swing dance remains poor, creating barriers to the development of training protocols and evaluation of performances. This study aimed to determine whether dancing with or without a partner affects the lower extremity kinematics of the triple step, and if the kinematics differ among the three steps of the dance element. Eight recreational swing dancers completed three sets of rightward triple steps with and without a partner. The angles in the sagittal, frontal and transverse planes were determined for bilateral lower limb joints …
The Effect Of Neuropriming And Focus Of Attention On Amateur Standing Long Jump Performance, Alexandra Mazza, Victoria Cimo, Kevin A. Valenzuela, Will Wu
The Effect Of Neuropriming And Focus Of Attention On Amateur Standing Long Jump Performance, Alexandra Mazza, Victoria Cimo, Kevin A. Valenzuela, Will Wu
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 1472-1480, 2022. Non-invasive brain stimulation has been prominent in recent neurophysiology research. The use of brain stimulation has not been examined in combination with the focus of attention paradigm, an established motor control tool. Therefore, the purpose of this study was to examine the effects of both brain stimulation and focus of attention on the outcome performance, peak force, lower extremity joint kinematics, and projection angle of a standing long jump. Forty-one participants were assigned to either the brain stimulation group or placebo group via a counterbalance design based on leg length and jump …
The Reliability Of Three-Dimensional Inertial Measurement Units In Capturing Lower-Body Joint Kinematics During Single-Leg Landing Tasks, Jacob M. Thomas, Roger O. Kollock
The Reliability Of Three-Dimensional Inertial Measurement Units In Capturing Lower-Body Joint Kinematics During Single-Leg Landing Tasks, Jacob M. Thomas, Roger O. Kollock
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 1306-1316, 2022. 3-D inertial measurement units (IMUs) have advantages over other types of motion capture systems, as IMUs cannot be obstructed by equipment and gear. Therefore, the purpose of this study was to assess the reliability of IMUs in measuring joint angles at the hip, knee, and ankle during two types of single-leg landings: 1) drop-landing (DL) and 2) leap-landing (LL). Nineteen subjects, both males (n = 9, 21.88 ± 1.64 yrs, 178.36 ± 9.68 cm, 185.68 ± 16.63 kg) and females (n = 11, 22.45 ± 4.32 yrs, 171.57 ± 6.55 …
Application Of Polynomial Regression Model For Joint Stiffness, Youngmin Chun, Craig Mcgowan, Jinah Kim, Joshua P. Bailey
Application Of Polynomial Regression Model For Joint Stiffness, Youngmin Chun, Craig Mcgowan, Jinah Kim, Joshua P. Bailey
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 1236-1245, 2022. Quasi-stiffness (joint stiffness) is often used to characterize leg properties during athletic and other activities and has been reported by a single slope of angle-moment curve. However, the joint angle-moment relationship of some relationship are not effectively represented by a simple linear regression model. Thus, the purpose of this analysis was to investigate the benefits of utilizing a 2nd order polynomial regression (quadratic) model as compared to the linear model when calculating lower extremity joint stiffness incorporating subdivided eccentric phases. Thirty healthy and active college students performed 15 drop jumps from …
Muscle Activation Patterns Of The Proximal Medial And Distal Biceps Femoris And Gluteus Maximus Among 6 Hip Extension And Knee Flexion Exercises In Trained Women., Bryn M. Stevens, Ben R. Nichols, Holly I. Doty, John Adam Korak
Muscle Activation Patterns Of The Proximal Medial And Distal Biceps Femoris And Gluteus Maximus Among 6 Hip Extension And Knee Flexion Exercises In Trained Women., Bryn M. Stevens, Ben R. Nichols, Holly I. Doty, John Adam Korak
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 1179-1189, 2022. The biceps femoris (BF) is a double-jointed muscle that performs both hip extension and knee flexion, making it a challenging muscle to train during common resistance training movements. An imbalance between the posterior and anterior chain increases the risk of lower-extremity injury. The purpose of this study was to compare BF proximal (BFprox), BF medial (BFmed), and BF distal (BFdist) peak and mean muscle activation among four hip hinging movements and two knee flexion movements. A secondary variable was gluteus maximus (GMax) muscle activation among the same six movements. Fifteen trained females …
Freely Chosen Cadence Is Increased During Repeated Bouts Of Submaximal Ergometer Pedalling, Andreas Schmidt, Jonas G. Madsen, Magnus K. Hyttel, Ernst A. Hansen
Freely Chosen Cadence Is Increased During Repeated Bouts Of Submaximal Ergometer Pedalling, Andreas Schmidt, Jonas G. Madsen, Magnus K. Hyttel, Ernst A. Hansen
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 1142-1155, 2022. It was investigated whether the phenomenon of repeated bout rate enhancement occurs during submaximal ergometer cycling. Repeated bout rate enhancement is defined as an increase of the freely, or spontaneously, chosen cadence during repeated bouts of pedalling and has previously been reported for finger tapping. This is relevant to study since cadence can affect biomechanical and physiological responses. Recreationally active individuals (n=27) performed five consecutive 5-min bouts of cycling at 100 W using freely chosen cadence. All bouts were separated by 10-min rest. Cadence, pedal force profile characteristics, heart rate, …
Immediate Effect Of Warm-Up On Single-Leg Balance In Individuals With And Without Functional Ankle Instability, Emily Abalos, You-Jou Hung
Immediate Effect Of Warm-Up On Single-Leg Balance In Individuals With And Without Functional Ankle Instability, Emily Abalos, You-Jou Hung
International Journal of Exercise Science
International Journal of Exercise Science 15(3): 1019-1027, 2022. Ankle sprains account for about 20% of all sports injuries in the United States. About 5-10 minutes of general warm-up is recommended to enhance performance and reduce injuries. However, its immediate impact on single-leg balance is unclear. The purpose of the study was to examine if different warm-up protocols could impact single-leg balance in individuals with and without functional ankle instability. Thirty volunteers (aged 19-29 years) participated in the study. The Cumberland Ankle Instability Tool was used to examine functional ankle stability and the Athletic Single-leg Stability Test of the Biodex Balance …
The Biomechanical Effects Of Percussive Therapy Treatment On Jump Performance, Fany Alvarado, Kevin Valenzuela, Amanda Finn, Elizabeth L. Avila, Jill Crussemeyer, Mikiko Nakajima
The Biomechanical Effects Of Percussive Therapy Treatment On Jump Performance, Fany Alvarado, Kevin Valenzuela, Amanda Finn, Elizabeth L. Avila, Jill Crussemeyer, Mikiko Nakajima
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 994-1006, 2022. Percussive therapy treatment is one form of myofascial release that has gained popularity amongst the sport community. It has been suggested that percussive therapy treatment may improve range of motion and improve athletic performance, but these claims are largely anecdotal. Currently, the effects of percussive therapy treatment on performance of athletic tasks is relatively unknown. Therefore, the purpose of this research was to assess the effects of percussive therapy treatment on jump performance and passive range of motion. Twenty-six recreationally active college individuals performed countermovement jump and drop jump activities on two …
Relationship Between Ground Reaction Force Characteristics And Bone Mineral Density Of The Hip And Spine In Male Runners, Michele Leblanc, Allison Burdullis, Marcus Mckinnon, Steven A. Hawkins
Relationship Between Ground Reaction Force Characteristics And Bone Mineral Density Of The Hip And Spine In Male Runners, Michele Leblanc, Allison Burdullis, Marcus Mckinnon, Steven A. Hawkins
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 655-666, 2022. The purpose of this study was to determine the relationship between running ground reaction force (GRF) characteristics and hip and lumbar spine bone mineral density (BMD) values in male runners. Individuals who ran at least 48.3 km per week and were injury-free were recruited. Kistler force plates collected running vertical and anteroposterior GRF data. A Hologic Discovery W bone densitometer measured lumbar spine and five regional hip BMD values. Only runners who consistently used a rear foot strike pattern were included (n = 32). Pearson correlation coefficients were calculated between BMD …
The Agreement Between A Portable Contact-Mat And Force-Plates During Bilateral Vertical Jumps, Stuart N. Guppy, Yosuke Kotani, Jason P. Lake, Christopher Latella, Jodie Cochrane Wilkie, Kristina L. Kendall, G. Gregory Haff
The Agreement Between A Portable Contact-Mat And Force-Plates During Bilateral Vertical Jumps, Stuart N. Guppy, Yosuke Kotani, Jason P. Lake, Christopher Latella, Jodie Cochrane Wilkie, Kristina L. Kendall, G. Gregory Haff
International Journal of Exercise Science
International Journal of Exercise Science 15(1): 632-644, 2022. Force plates are commonly used when assessing vertical jumping performance but are not always affordable or practical tools for all testing situations. Twenty-four participants volunteered to take part in a study investigating the agreement between bilateral force plates and a new commercially available contact mat that records jump height, flight-time (FT), and FT of individual limbs during both countermovement (CMJ) and squat (SJ) jumps. Each participant performed six jumps of each type while standing on a contact mat placed upon a pair of in-ground force plates. When compared to the force plate …