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Bente R. Jensen, Line Hovgaard-Hansen and Katrine L. Cappelen

Running on a lower-body positive-pressure (LBPP) treadmill allows effects of weight support on leg muscle activation to be assessed systematically, and has the potential to facilitate rehabilitation and prevent overloading. The aim was to study the effect of running with weight support on leg muscle activation and to estimate relative knee and ankle joint forces. Runners performed 6-min running sessions at 2.22 m/s and 3.33 m/s, at 100%, 80%, 60%, 40%, and 20% body weight (BW). Surface electromyography, ground reaction force, and running characteristics were measured. Relative knee and ankle joint forces were estimated. Leg muscles responded differently to unweighting during running, reflecting different relative contribution to propulsion and antigravity forces. At 20% BW, knee extensor EMGpeak decreased to 22% at 2.22 m/s and 28% at 3.33 m/s of 100% BW values. Plantar flexors decreased to 52% and 58% at 20% BW, while activity of biceps femoris muscle remained unchanged. Unweighting with LBPP reduced estimated joint force significantly although less than proportional to the degree of weight support (ankle).It was concluded that leg muscle activation adapted to the new biomechanical environment, and the effect of unweighting on estimated knee force was more pronounced than on ankle force.

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Mhairi K. MacLean and Daniel P. Ferris

and complexity in the ambulatory tasks. Walking at a single speed on a treadmill is a good way of collecting data for a steady-state condition, but there are very few steady-state conditions in real-world ambulation. Walking in the real world is often over uneven and varied terrain, interspersed with

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Katrina G. Ritter, Matthew J. Hussey and Tamara C. Valovich McLeod

values. 8 Patients are subjected to an initial aerobic protocol to establish the baseline symptomatic threshold. In the standard Balke Treadmill Concussion test, the baseline is determined by the patient reporting symptoms or unable to achieve full incline. 5 , 9 In the studies included, there were

Open access

Salman Nazary-Moghadam, Mahyar Salavati, Ali Esteki, Behnam Akhbari, Sohrab Keyhani and Afsaneh Zeinalzadeh

during movement with inherent periodicity, and it is primarily effective for the gait analysis. 7 The LyE has been examined in treadmill walking with and without cognitive loads. 5 LyE measures gait stability or the sensitivity of a dynamic system to exceedingly small perturbations. To the best

Open access

Matthew C. Hoch, David R. Mullineaux, Kyoungkyu Jeon and Patrick O. McKeon

Single joint kinematic alterations have been identified during gait in those with chronic ankle instability (CAI). The purpose of this study was to compare sagittal plane hip, knee, and ankle kinematics during walking in participants with and without CAI. Twelve individuals with CAI and 12 healthy individuals walked on a treadmill at 1.5 m/s. Three-dimensional kinematics were analyzed using mean ensemble curves and independent t tests. Participants with CAI demonstrated less lower extremity flexion during the absorption phase of stance and the limb placement phase of swing, which may have implications for limb placement at initial contact.

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Hyunjae Jeon and Abbey C. Thomas

: patellofemoral pain; recreational runners (3 times/week, total 6 miles/week or greater); between ages of 18 and 45; symptoms longer than 2 months; excessive hip adduction, pelvic drop during treadmill running Exclusion criteria: cardiovascular condition, injury which can influence gait Inclusion criteria

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Kimmery Migel and Erik Wikstrom

Participants walked on a treadmill with shoes in a taped (basket weave) and a nontaped condition. The order of condition was randomized Participants walked on a flat surface under a nonbraced condition, followed by a flexible brace, and a semirigid brace condition. The order of the brace conditions was

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Ryan D. Henke, Savana M. Kettner, Stephanie M. Jensen, Augustus C.K. Greife and Christopher J. Durall

) evidence from all 3 studies indicates that SRC symptom severity decreased across the study interval in response to LIAEX. In the reviewed studies, no adverse effects were reported when LIAEX was performed 5 to 7 days per week on a stationary bike or treadmill for 10 to 20 minutes at 50% to 70% of age

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Kailin C. Parker, Rachel R. Shelton and Rebecca M. Lopez

1.85 (0.13) m 2 9 males; aged 24 (4) y, height 177.3 (9.9) cm, body mass 76.7 (11.6) kg, body fat 14.7% (5.8%) Experimental design and methods Randomized, counterbalanced, crossover trial Ran on a treadmill up to 60 min in heat (ambient temp. 39.5°C [3.1°C] [103.1°F], humidity 38.1% until T RE

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Nicholas Hattrup, Hannah Gray, Mark Krumholtz and Tamara C. Valovich McLeod

stationary bike or treadmill at home or in gym under supervision at prescribed target heart rate while wearing Bluetooth heart rate monitor. The prescription was calculated as 80% of the HR achieved at symptom exacerbation on the BCTT at the first visit. Participants were told to stop if symptoms increased