Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 216 for “"lower body"”.
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Development of fMRI compatible lower body negative pressure system
The lower body negative pressure (LBNP) system provides a controlled, measured orthostatic stress to the cardiovascular system, which can be used with a magnetic resonance imaging (MRI) machine to study cardiovascular and cerebrovascular responses to graded LBNP. In the past, even though functional …
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Design and Evaluation of an Underactuated Lower Body Exoskeleton
An underactuated exoskeleton design for walking assistance is presented and evaluated. The exoskeleton uses one motor per leg and makes use of a pantograph to reduce the overall profile and allow the exoskeleton to closely follow the shape of the user's leg. Support is provided between the ball of …
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Design of an Underactuated Lower Body Exoskeleton Using a Pantograph
… paper presents the design of an underactuated lower body exoskeleton to assist with walking. It reduces the amount of bodyweight going through the user's leg by providing a supporting force to the user that is engaged and disengaged depending on the stage of the gait cycle the user is in. It is …
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Tolerance to Lower Body Negative Pressure: Effects of Sex and Sufentanil
… reduces tolerance to a simulation of hemorrhage (lower-body negative pressure; LBNP). METHODS: Participants for both studies were instrumented for continuous measurements of heart rate (electrocardiography), beat-to-beat blood pressure (finometer), and muscle sympathetic nerve activity …
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The effect of whole body vibration on lower body resistance detraining
This study explored the effect of whole body vibration (WBV) with magnitudes between 2.56 g and 7.68 g on detraining of the 5-repetition maximum (5RM) squat, extensors and flexors of the knee and the flexors and extensors of the ankle. All participants were trained using a lower body resistance …
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Bilateral deficit: A comparison between upper-body and lower-body maximal strength
<p>Purpose: The study’s primary purpose was to determine if maximal unilateral strength is greater than maximal bilateral strength for the leg press and vertical dumbbell press exercises. The secondary purpose was to determine if blood glucose levels differ between the unilateral and bilateral …
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Designing a Localized Lower Body Negative Pressure Garment for Long-Duration Spaceflight
Lower Body Negative Pressure (LBNP) has long been explored as a countermeasure to the physiological deconditioning and orthostatic intolerance associated with prolonged microgravity exposure. Traditional LBNP systems, however, are large, stationary devices that require astronauts to remain immobile …
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Biomechanical effects on lower-body extremities during a maximum effort kettlebell swing protocol
… was to examine the kinematics and kinetics of lower-body joints during a repeated, maximum effort kettlebell swing protocol. Sixteen resistance and kettlebell swing experienced males performed 10 rounds of a kettlebell swing routine (30 s of swings followed by 30 s of rest). Each participant …
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Lower Body Kinematic Comparisons between Front and Back Squats in Response to Loads
… has been advocated to reduce the stress to the lower back while increasing the leg strength. The proper front squat technique and the changes in the spine and lower extremity joints in response to load mass are still unclear. Therefore, the purpose of this study was to examine the lower body …
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Partial Gravity Load Simulation Using Mechanical Off-Loading and Lower Body Negative Pressure
… Second, this thesis evaluates a collapsible lower body negative pressure (LBNP) suit as a wearable countermeasure for micro and partial gravity environments. By applying negative pressure to the lower body, the suit helps restore the mechanical loading and hydrostatic fluid gradients …
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The effect of a lower-Body exoskeleton on physical and cognitive warfighter performance
United States warfighters carry very heavy equipment into battle; robotic exoskeletons offer a promise to off-load the warfighter. While exoskeletons are currently evaluated for their effects on the user's physical performance, their cognitive effects are not currently considered in the literature. …
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IMU-based estimation of human lower body kinematics and applications to extravehicular operations
The use of body-worn inertial measurement units (IMUs) as an alternative to traditional human optical motion capture (OMC) techniques has gained increasing attention over the last twenty years. In contrast to traditional OMC, IMUs are less intrusive and allow measurements to be taken in the …
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Lower body exoskeleton for walking gait assistance and performance augmentation using compliance controlled actuators
… of a new "human friendly" 10-degree of freedom lower bodyexoskeleton for walking gait assistance and also generic human force augmentation. The twinwearable legs are powered by 20 braided pneumatic Muscle Actuators (pMAs); a new, low mass,high power to weight and volume actuation system. In …
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The Relationship between Lower Body Power and Sprinting Ability in Recreationally Trained College Men
… The subjects' mean (± SD) age, height, weight, body fat percentage and fat free mass were 21.1±2.26 years, 179.88± 6.53 cm, 73.57± 7.38 kg, 11.26 ± 3.92 percent and 63.62± 12.44 kg respectively. To examine the relationship between jumping and sprinting, researchers measured the members of the …
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Training adaptations in lower-body muscle structure and physical performance capacities of competitive surfing athletes
… and sport scientists’ understanding of the lower-body muscle structures related to enhanced lower-body physical capacities, and how to best evoke desirable training-specific adaptations. To address this aim, three successive steps of research were evaluated: (1) analysis of the factors …
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Mechanical Design of the Legs for OLL-E, a Fully Self-Balancing, Lower-Body Exoskeleton
… including a reduction in the risk of upper-body injuries associated with extended wheelchair use. To fully mitigate this risk of injury, exoskeletons will need to be fully self-balancing, able to move and stand without crutches or other walking aid. To accomplish this, the Orthotic …
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Performance characteristics of elite softball players: Changes and determinants of performance related to the lower body
… correlated (r = 0.89; p < 0.01). Fz2 relative to bodyweight (Fz2/BW) was also significantly correlated to PV (r = .801, p < 0.05). No other GRF measures were significantly correlated to PV. A high ICC and low CV across the variables support the reliability of GRF and PV over multiple trials. The …
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Lower body mechanics of golf swing and its association with maximum clubhead speed in skilled golfers
… select kinematic and kinetic parameters of the lower extremity during the swing in skilled golfers.A total of 25 healthy,right-handed, male golfers with a posted handicap of 3 or better were recruited for this study. Peak orientation angles (OA)and ranges of the OA of the lower extremity joints …
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