Effects Of Lower Extremity Posture On Hip Strength And Their Influence On Lower Extremity Motion During A Single Leg Squat

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Effects of Lower Extremity Posture on Hip Strength and Their Influence on Lower Extremity Motion During a Single Leg Squat

Author : Anh-Dung Nguyen
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (657 download)

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Book Synopsis Effects of Lower Extremity Posture on Hip Strength and Their Influence on Lower Extremity Motion During a Single Leg Squat by : Anh-Dung Nguyen

Download or read book Effects of Lower Extremity Posture on Hip Strength and Their Influence on Lower Extremity Motion During a Single Leg Squat written by Anh-Dung Nguyen and published by . This book was released on 2007 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research investigated the effects of static lower extremity posture on hip strength, and then examined their collective influence on knee and hip joint kinematics during a single leg squat in males and females. Thirty one healthy males and 31 healthy females, predominantly college students, between the ages of 18 and 35 participated in a single data collection session during which six lower extremity posture characteristics were measured, followed by measurement of hip abduction and extension strength and concluded with neuromuscular and kinematic analysis of the hip and knee during a single leg squat. Hip torque was normalized to body mass and electromyographic data were normalized to maximum voluntary isometric contractions. Five single leg squats were performed on the dominant stance limb to a depth of 60° of knee flexion. Path analysis, implemented by structural equation modeling, was used to examine whether greater lower extremity posture characteristics predicted decreased hip torque and whether greater lower extremity posture characteristics and decreased hip torque collectively predicted greater dynamic valgus knee motion (increased hip adduction and internal rotation, and knee external rotation and valgus). Separate multivariate analyses of variance determined whether females and males differed on measures of lower extremity posture, hip strength, and total hip and knee motion during the single leg squat. The findings were that greater hip anteversion predicted decreased hip abduction torque, and greater tibiofemoral angle predicted decreased hip extension torques. Direct relationships were noted between greater hip anteversion and genu recurvatum with greater knee external rotation, and between greater navicular drop and hip anteversion with greater hip internal rotation during the single leg squat. Furthermore, decreased hip abduction torque predicted greater knee external rotation while decreased hip extension torque predicted greater knee valgus during a single leg squat. Hence, it was concluded that greater lower extremity posture characteristics predicted decreased posterio-lateral hip strength, and collectively, greater lower extremity posture characteristics and decrease posterio-lateral hip strength predicted greater functional valgus collapse during the single leg squat.

Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat

Author : Brian Bolin
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat by : Brian Bolin

Download or read book Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat written by Brian Bolin and published by . This book was released on 2013 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat

Author : Marissa N. Laddusaw
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat by : Marissa N. Laddusaw

Download or read book Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat written by Marissa N. Laddusaw and published by . This book was released on 2012 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat

Author : Elizabeth J. Kornkven
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat by : Elizabeth J. Kornkven

Download or read book Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat written by Elizabeth J. Kornkven and published by . This book was released on 2012 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat

Author : Brady Stokes
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat by : Brady Stokes

Download or read book Effect of Frontal Plane Foot Position on Lower Extremity Muscle Activation and Limb Positioning in a Single Leg Squat written by Brady Stokes and published by . This book was released on 2013 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Hip Strength and Lower Extremity Mechanics in Females with and Without Patellofemoral Pain

Author : John D. Willson
Publisher : ProQuest
ISBN 13 : 9780549182252
Total Pages : pages
Book Rating : 4.1/5 (822 download)

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Book Synopsis Hip Strength and Lower Extremity Mechanics in Females with and Without Patellofemoral Pain by : John D. Willson

Download or read book Hip Strength and Lower Extremity Mechanics in Females with and Without Patellofemoral Pain written by John D. Willson and published by ProQuest. This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Patellofemoral pain syndrome (PFPS) remains a prevalent athletic injury, especially among females. Hip strength differences between females with and without PFPS has led to speculation that individuals with PFPS are prone to abnormal lower extremity alignment during weightbearing activities. This is thought to be due, in part, to an inability to adequately resist external moments at the hip. This tendency for malalignment may be especially evident if weightbearing activities are performed in a state of fatigue. The first aim of this study was to analyze lower extremity mechanics in females with and without patellofemoral pain (PFPS) during three different activities. We hypothesized that differences in lower extremity mechanics between groups would increase during activities with greater loading. 20 females with PFPS and 20 healthy female controls performed single leg (SL) squats, running, and repetitive SL jumps. The results suggest the PFPS group consistently demonstrates altered lower extremity kinematics during each activity, regardless of the magnitude of the external load. For the second aim, we examined the effect of exertion on hip strength and lower extremity mechanics between groups during SL jumps. We hypothesized that differences between groups would be greater following the exertion protocol. However, PFPS subjects demonstrated hip mechanics that differed from the control group throughout the protocol, and both groups demonstrated a similar response to exertion. The third aim of this study was to examine the association between trunk, hip, and knee joint strength and lower extremity mechanics between groups. Subjects with PFPS exhibited decreased hip and trunk strength compared with healthy subjects. However, these strength measurements were weakly to moderately correlated with mechanics suspected to contribute to the etiology or exacerbation of PFPS. The final aim of this study was to evaluate the construct validity and clinical utility of a 2D measure of lower extremity alignment (FPPA). The results suggest that the FPPA may be a useful clinical measure. The FPPA was significantly associated with LE kinematics known to increase retropatellar stress during dynamic activities. Additionally, PFPS subjects demonstrated greater FPPA values than the control group. The results of these four aims highlight kinematic and kinetic differences between females with and without PFPS which may contribute to the exacerbation and etiology of this condition. Conservative treatment programs focused on minimizing these differences in hip strength and lower extremity mechanics may improve long term patient outcomes.

Routledge Handbook of Biomechanics and Human Movement Science

Author : Youlian Hong
Publisher : Routledge
ISBN 13 : 1134132336
Total Pages : 833 pages
Book Rating : 4.1/5 (341 download)

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Book Synopsis Routledge Handbook of Biomechanics and Human Movement Science by : Youlian Hong

Download or read book Routledge Handbook of Biomechanics and Human Movement Science written by Youlian Hong and published by Routledge. This book was released on 2008-06-03 with total page 833 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Routledge Handbook of Biomechanics and Human Movement Science is a landmark work of reference. Now available in a concise paperback edition, it offers a comprehensive and in-depth survey of current theory, research and practice in sports, exercise and clinical biomechanics, in both established and emerging contexts. Including contributions from many of the world's leading biomechanists, the book is arranged into five thematic sections: biomechanics in sports injury, orthopedics and rehabilitation health and rehabilitation training, learning and coaching methodologies and systems of measurement. Drawing explicit connections between the theoretical, investigative and applied components of sports science research, this book is both a definitive subject guide and an important contribution to the contemporary research agenda in biomechanics and human movement science. It is essential reading for all students, scholars and researchers working in sports biomechanics, kinesiology, ergonomics, sports engineering, orthopaedics and physical therapy.

Muscle Activity in Lower Extremity During Single-leg Squat

Author : Brett J. Debele
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Muscle Activity in Lower Extremity During Single-leg Squat by : Brett J. Debele

Download or read book Muscle Activity in Lower Extremity During Single-leg Squat written by Brett J. Debele and published by . This book was released on 2011 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Endurance Sports Medicine

Author : Timothy L Miller
Publisher : Springer
ISBN 13 : 3319329820
Total Pages : 336 pages
Book Rating : 4.3/5 (193 download)

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Book Synopsis Endurance Sports Medicine by : Timothy L Miller

Download or read book Endurance Sports Medicine written by Timothy L Miller and published by Springer. This book was released on 2016-08-12 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing comprehensive discussion of this newly developing branch of sports medicine, this unique and up-to-date book focuses specifically on the treatment of athletes who train for and participate in endurance sporting events, including not only traditional endurance athletes such as runners, swimmers, bikers and triathletes, but also rowers, adventure racers, military personnel, and cross-fit athletes. Detailing strategies for not only treating and preventing injuries and conditions but also for optimizing an athlete’s performance, it is divided into three thematic sections. The first section covers common medical conditions faced by the endurance athlete, including cardiovascular conditions, asthma, and heat- and altitude-related illnesses, while also discussing gender differences, pregnancy and the pediatric endurance athlete. Section two focuses on the management of common musculoskeletal conditions, such as stress fractures, overuse injuries of the soft tissue, compartment syndrome, shoulder and hip injuries, and exercise and osteoarthritis. The last section presents special considerations for the endurance athlete, including gait and swim-stroke analysis, bike fitting, mental preparation, optimizing nutrition, and how to organize medical coverage for events, as well as decision-making for return to play. A timely topic and one which has not been written about extensively in one concise collection of chapters, Endurance Sports Medicine is a valuable guide for sports medicine physicians, orthopedists, athletic trainers, physical therapists, coaches, officials, and athletes in understanding the needs of the determined individuals who participate in endurance sports.

ACL Injuries in the Female Athlete

Author : Frank R. Noyes
Publisher : Springer Science & Business Media
ISBN 13 : 3642325920
Total Pages : 536 pages
Book Rating : 4.6/5 (423 download)

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Book Synopsis ACL Injuries in the Female Athlete by : Frank R. Noyes

Download or read book ACL Injuries in the Female Athlete written by Frank R. Noyes and published by Springer Science & Business Media. This book was released on 2013-01-04 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nearly a million anterior cruciate ligament (ACL) injuries occur each year worldwide, causing long-term problems in the knee joint. This textbook examines the short- and long-term impacts of ACL injuries on the basis of hundreds of published studies. Risk factors for such injuries are explored using data from hypothesis-driven investigations, and possible causes of the higher risk of noncontact ACL injuries in female athletes are analyzed. Neuromuscular training programs shown to reduce the rate of these injuries in female athletes are described in step-by-step detail with the aid of numerous color photographs and video demonstrations. In addition, detailed descriptions are provided for rehabilitation programs to be used after ACL reconstruction in order to reduce the risk of a future injury. The book will be of value to orthopedic surgeons, physical therapists, athletic trainers, sports medicine primary care physicians, and strength and conditioning specialists.

A Comparison of Single Leg Squat and Side Step Cut Kinematics in Healthy and ACL Reconstructed Populations

Author : Jarrett JE. Sorge
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (881 download)

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Book Synopsis A Comparison of Single Leg Squat and Side Step Cut Kinematics in Healthy and ACL Reconstructed Populations by : Jarrett JE. Sorge

Download or read book A Comparison of Single Leg Squat and Side Step Cut Kinematics in Healthy and ACL Reconstructed Populations written by Jarrett JE. Sorge and published by . This book was released on 2014 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effects of Squatting Speed on Lower Extremity Kinematics and Kinetics During Stable and Unstable Squat

Author : Mohammad Bader Hasan
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (114 download)

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Book Synopsis Effects of Squatting Speed on Lower Extremity Kinematics and Kinetics During Stable and Unstable Squat by : Mohammad Bader Hasan

Download or read book Effects of Squatting Speed on Lower Extremity Kinematics and Kinetics During Stable and Unstable Squat written by Mohammad Bader Hasan and published by . This book was released on 2018 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the study was to investigate the effects of surface instability and movement speed on key kinematic and kinetic factors (ground reaction force, moment arm [MA], resultant joint moments) in the lower extremity joints (ankles, knees, and hips) during squat. A total of 30 healthy college students (8 males and 22 females) performed six different squat conditions based on 2 surfaces (stable and unstable) and 3 speeds (slow, moderate, and fast). Normalized peak resultant joint moments (RJM) of the lower extremity joints (i.e., hips, knees, and ankles) were extracted from each trial. Two two-way repeated-measure MANOVAs (2 x 3) were performed. The first MANOVA test was to compare resultant joint moment variables, whereas, the second MANOVA test was conducted to compare ground reaction force and moment arm variables with the speed and surface condition being the factors in both. The first MANOVA with RJM variables revealed a significant speed * surface interaction (p

Range of Motion and Plantar Foot Pressures in Those with and Without a Lateral Hip Shift During an Overhead Squat

Author : Erin M. Lally
Publisher :
ISBN 13 : 9781369203110
Total Pages : 75 pages
Book Rating : 4.2/5 (31 download)

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Book Synopsis Range of Motion and Plantar Foot Pressures in Those with and Without a Lateral Hip Shift During an Overhead Squat by : Erin M. Lally

Download or read book Range of Motion and Plantar Foot Pressures in Those with and Without a Lateral Hip Shift During an Overhead Squat written by Erin M. Lally and published by . This book was released on 2016 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asymmetrical loading between lower limbs can theoretically be explained as an inequality of strength, neuromuscular control, or subconscious reliance on one leg more than the other. Asymmetries are often identified utilizing costly equipment such as force plates and 3D motion analysis cameras. It is important to establish less costly ways of identifying movement and loading asymmetries for clinicians to utilize. One qualitative assessment that may identify asymmetries is a 'lateral hip shift' during an overhead squat. Objective: To identify differences in lower extremity range of motion (ROM) and plantar foot pressures in individuals with and without a lateral hip shift during an overhead squat. Design: Cross-Sectional Observation. Setting: Lab. Participants: Twenty-nine (14 males and 15 females) physically active individuals participated in this study. Seventeen individuals with a lateral hip shift during an overhead squat (LAT; Age = 21.2 +/- 2.1 years, Height = 175.1 +/- 9.1 cm, Mass = 77.6 +/- 14.2 kg) and twelve without (CON; Age = 20.8 +/- 2.1 years, Height = 177.4 +/- 6.8cm, Mass = 77.8 +/- 11.1kg) were identified through screening. Interventions: Participants were screened for a lateral hip shift while performing five overhead squats to determine group allocation (LAT, CON). All ROM measures were performed in a randomized order followed by additional trials of the overhead squat while standing on the pressure sensor mat. Main Outcome Measures: Active, passive, and weight-bearing ROM for ankle dorsiflexion (DF) and passive hip abduction, internal, and external rotation were measured. Plantar pressure variables were captured via a pressure sensor mat during the overhead squat, including side-to-side weight bearing %, anterior-posterior excursion (cm), left-right excursion (cm), and center of force (COF) distance (cm). Results: A significant group-by-limb interaction for active DF ROM, such that the LAT group had less active DF ROM with the knee flexed on the limb they shifted away from in comparison to the assigned CON limb (mean difference = 6.87º +/- 0.2). The LAT group also had less active DF ROM with the knee extended (3.07° +/- 1.25) compared to the CON group (8.30° +/- 1.49). No differences were observed on other ROM variables. The LAT group demonstrated greater movement in their center of force on the plantar pressure mat for total distance (mean difference = 24.27 cm +/- 0.4) and LR excursion (mean difference = 2.96 cm +/- 3.2). Conclusion: Participants with a lateral shift during an overhead squat generally had decreased active ankle DF ROM and greater movement of their center of force. Clinically, addressing active DF ROM may promote more symmetrical loading during an overhead squat.

Relationship Between Back Squat Strength to Body Mass Ratio and Muscle Activity During Single-leg Landing Tasks in Varsity Athletes

Author : Sébastien Girard
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)

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Book Synopsis Relationship Between Back Squat Strength to Body Mass Ratio and Muscle Activity During Single-leg Landing Tasks in Varsity Athletes by : Sébastien Girard

Download or read book Relationship Between Back Squat Strength to Body Mass Ratio and Muscle Activity During Single-leg Landing Tasks in Varsity Athletes written by Sébastien Girard and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The number of injuries sustained by female athletes has been on the rise. Female athletes are 4 to 8 times more at risk of suffering an anterior cruciate ligament injury (ACL). Strength is believed to be an important predictor of ACL injury in female athletes and has been a focus of improvement in injury prevention programs. However, there is a lack of consensus on the relationship between muscle strength and hip and knee kinematics during landing tasks. Only a few studies used a lower extremity relative strength measure and reported promising results, but none of them reported EMG activity. The goal of this study was to explore the relationship between back squat strength to body mass ratio and the lower limb muscle activity during single-leg landing tasks. Twenty-eight varsity athletes were recruited (13 males and 15 females) from various sports from the universities in the Montreal, Québec region. Participants were asked to perform a standardized 1-RM back squat test followed by single-leg drop landings from 28cm and 44cm plyometric boxes. EMG data was collected 150ms pre-initial and 250ms post-initial contact for the following muscles: biceps femoris (BF), semitendinosus (ST), vatus lateralis (VL), vastus medialis (VMO), rectus femoris (RF), gluteus medius (GMED) and gluteus maximus (GMAX). Significant differences were found between male and female athletes on the back squat one-repetition maximum and squat to body mass ratio (SQ:BW). Females had significantly more neuromuscular activity of the quadriceps and GMAX, and significantly less activity of the biceps femoris in both landing phases. After controlling for strength, only significant differences in RF, BF and GMAX activity remained between sexes in the deceleration phase. Prior to landing, moderate negative correlations between VL, VMO and GMAX activity and SQ:BW were observed at both drop heights. During the post-initial contact phase, moderate negative correlations for VL and VMO activity were found at both drop heights. Our findings suggest that researchers looking at sex-based differences in muscle activity should control for relative strength differences between groups as it may influence muscle activity during landing tasks.

Biomechanics of the Lower Extremity During a Single Leg Drop Landing

Author : Lori L. Webster-Dahl
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.:/5 (162 download)

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Book Synopsis Biomechanics of the Lower Extremity During a Single Leg Drop Landing by : Lori L. Webster-Dahl

Download or read book Biomechanics of the Lower Extremity During a Single Leg Drop Landing written by Lori L. Webster-Dahl and published by . This book was released on 2006 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Comparison of an Overhead and Single Leg Squat in Barefoot, Minimalist, and Shod Conditions

Author : Jennifer M. Guiry
Publisher :
ISBN 13 :
Total Pages : 35 pages
Book Rating : 4.:/5 (944 download)

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Book Synopsis Comparison of an Overhead and Single Leg Squat in Barefoot, Minimalist, and Shod Conditions by : Jennifer M. Guiry

Download or read book Comparison of an Overhead and Single Leg Squat in Barefoot, Minimalist, and Shod Conditions written by Jennifer M. Guiry and published by . This book was released on 2014 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most analyzed activity in barefoot and minimalist conditions has been gait in relation to walking and running. However, there has been an increase in use of minimalist style shoes in activities other than running such as resistance training, hiking, cross training, etc. When comparing barefoot and minimalist to shod conditions there have been positive adaptations found. While there are adaptations in running gait it is unknown if adaptations occur in other activities when comparing barefoot and minimalist to shod conditions. The goal of this study was to investigate biomechanical differences in an overhead and single leg squat in barefoot, minimalist, and shod conditions. It was hypothesized that (a) barefoot, minimalist, and shod conditions will result in differences in joint excursion and total mechanical energy expenditure at the ankle, knee, and hip (b) minimalist conditions will be similar to barefoot conditions when compared to shod conditions, and (c) ankle range of motion will exacerbate these differences. A total of 32 able-bodied, Division I athletes that partook in strength and condition sessions with a certified strength and conditioning specialist (CSCS) participated in the current study. Participants had no history of lower leg injury in the previous six months. Participants were grouped based on their choice of daily footwear, minimalist style or traditional shod.. Participants completed ten repetitions of a single leg and overhead squat in barefoot and minimalist/shod conditions. Testing consisted of 3D motion analysis. The results of the study found that ankle range of motion did not differ between groups (P= .566). During an overhead squat it was found that there was a significant effect at the hip by condition (P= .004), all other interactions, joint excursions, and total mechanical energy expenditure were not significant. In the single leg squat it was found that there was a significant effect at knee by condition (P= .040), all other interactions, joint excursions, and total mechanical energy expenditure were not significant. Clinicians and researchers can use the results of the study to further investigate differences in barefoot, minimalist, and shod activities in activities other than running.

Surface Electromyography

Author : Roberto Merletti
Publisher : John Wiley & Sons
ISBN 13 : 1118987020
Total Pages : 592 pages
Book Rating : 4.1/5 (189 download)

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Book Synopsis Surface Electromyography by : Roberto Merletti

Download or read book Surface Electromyography written by Roberto Merletti and published by John Wiley & Sons. This book was released on 2016-05-02 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflects on developments in noninvasive electromyography, and includes advances and applications in signal detection, processing and interpretation Addresses EMG imaging technology together with the issue of decomposition of surface EMG Includes advanced single and multi-channel techniques for information extraction from surface EMG signals Presents the analysis and information extraction of surface EMG at various scales, from motor units to the concept of muscle synergies.