ZHANG, S-N., B. T. BATES, and J. S. DUFEK. Contributions of lower extremity joints to energy dissipation during landings. Med. Sci. Sports Exerc., Vol. 32, No. 4, pp. 812–819, 2000. Purpose: The purpose the study was investigate changes in joint absorption for different landing heights techniques. Methods: Nine healthy, active male subjects volunteered perform step-off landings from three (0.32 m, 2.5 m-s; 0.62 3.5 1.03 4.5 m-s) using techniques (soft, SFL; normal, NML; stiff landing, STL)....

Barefoot or minimal footwear running is currently a highly debated topic among runners and researchers. Several companies have developed to simulate barefoot but few studies compared shoes during running. The primary goal of this study was compare acute changes in three-dimensional (3D) ground reaction forces (GRFs) lower limb kinematics kinetics habitually shod rearfoot strike (RFS) forefoot (FFS) between (MSH), neutral cushion (SH). Lower extremity joint biomechanical variables RFS FFS...

Abstract Background Flip‐flops and sandals are popular choices of footwear due to their convenience. However, the effects these types on lower extremity biomechanics still poorly understood. Therefore, objective this study was investigate differences in ground reaction force (GRF), center pressure (COP) joint kinematic kinetic variables during level‐walking flip‐flops, barefoot compared running shoes. Methods Ten healthy males performed five walking trials four conditions at 1.3 m/s....

No studies have compared effectiveness of resistance training and Tai Ji exercise on relieving symptoms knee osteoarthritis (OA). The purpose the study was to evaluate effects a 10-week intervention improving OA mobility in seniors with OA. Thirty-one (60–85 years) were randomly assigned program (n = 12), 13), control group 6). All participants completed Western Ontario McMaster (WOMAC) Osteoarthritis Index performed three physical performance tests (6-min walk, timed-up-and-go, timed stair...

The purpose of this study was to examine effects shoe midsole densities and mechanical demands (landing heights) on impact shock attenuation lower extremity biomechanics during a landing activity. Nine healthy male college athletes performed 5 trials step-off in each 9 test conditions, i.e., combination landings shoes 3 (soft, normal, hard) from potential energy (PE) levels (low, median, high). Ground reaction forces (GRF), accelerations (ACC) the tibia forehead, sagittal kinematic data were...

Shock reduction has been well studied in moderate activities such as walking and running. However, there is a clear lack of research concerning shock wave transmission more strenuous landing activities. In this study, we examined the impact with varied mechanical demands. Ten active males were recruited for study. They performed five successful step-off trials from each heights: 30, 45, 60, 75, 90 cm. Right sagittal kinematics, ground reaction forces, acceleration recorded simultaneously....

Increased step widths have been shown to reduce peak internal knee abduction moments in healthy individuals but not osteoarthritis patients during stair descent. This study aimed assess effects of increased on and associated variables adults with medial older ascent. Thirteen 13 performed ascent using preferred, wide, wider widths. Three-dimensional kinematics ground reaction forces (GRFs) an instrumented staircase were collected. width reduced first second moments, moment impulse. In...

Study Design Controlled laboratory study. Objectives To examine effectiveness of an ankle brace with a subtalar locking system in restricting inversion during passive and dynamic movements. Background Semirigid braces are considered more effective than other types brace, but semirigid may be even effective. Methods Nineteen healthy subjects no history major lower extremity injuries were included the Participants performed 5 trials drop test lateral-cutting movement without wearing while...

The purpose of this study was to explore the footwear effects on impact forces and soft-tissue vibrations during landing. 12 male basketball players were instructed perform drop jumps unanticipated landings from 30 cm, 45 60 cm heights in shoes (BS) control (CS). 3D kinematics, ground reaction force (GRF), leg, acceleration shoe heel counter measured simultaneously. results showed no significant effect characteristics nor resonance frequency peak transmissibility phase jump. For landings,...

The purpose of the study was to investigate effects variability as a function sample size on Pearson product-moment correlation coefficient (PCC) under assumption perfect relationship between two variables. (subjects/trials) and PCC were demonstrated using computer model. model also used evaluate selected examples taken from literature. results indicated that in excess 10% range for each variable resulted mean reduction shared variance by 50% or greater. Although did not affect PCC, it have...

The purpose of this study was to examine effects a sport version semi-rigid ankle brace (Element™) and soft (ASO) on biomechanics ground reaction forces (GRFs) during drop landing activity in subjects with chronic instability (CAI) compared healthy no history CAI. Ten 10 who had multiple sprains participated the as control unstable subjects, respectively. CAI were age, body mass index gender matched subjects. arch functions measured subject screening session. During biomechanical test...

Although effects of workload and cadence on sagittal plane knee biomechanics in cycling have been widely studied, few studies examined their impact the frontal plane.The purpose this study was to investigate different workloads cadences biomechanics.Eighteen healthy participants (age, 55.7 ± 11.0 yr) volunteered for study. A motion analysis system a custom instrumented pedal were used collect five cycles three-dimensional kinematics (240 Hz) reaction force (PRF, 1200 during 2 min each eight...