Search Results

You are looking at 1 - 10 of 81 items for :

  • User-accessible content x
Clear All
Open access

Aaron Nelson, Nathan Koslakiewicz and Thomas Gus Almonroeder

) motion capture is limited as a clinical tool because of the time and expertise required for data collection or processing. The development of surrogate measures to assess knee kinetic symmetry may help to improve rehabilitation. Analysis of ground reaction force (GRF) symmetry using force plate

Full access

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.

Open access

Richard A. Brindle, David Ebaugh and Clare E. Milner

strengthening is a common component of treatment. 3 In a side-lying hip abductor strength test, an adduction force is applied to the patient’s limb through a handheld dynamometer that either matches or exceeds the patient’s maximum isometric force. In a hip abductor eccentric strength test or “break test,” the

Open access

Genki Hatano, Shigeyuki Suzuki, Shingo Matsuo, Satoshi Kataura, Kazuaki Yokoi, Taizan Fukaya, Mitsuhiro Fujiwara, Yuji Asai and Masahiro Iwata

muscles. Therefore, the duration of the effects of static stretching was investigated by comparing SPT, ROM, passive torque (PT) at the onset of pain, passive stiffness, and isometric muscle force before stretching versus 10, 20, and 30 minutes after stretching. The purpose of this study was to elucidate

Full access

Tomomasa Nakamura, Yuriko Yoshida, Hiroshi Churei, Junya Aizawa, Kenji Hirohata, Takehiro Ohmi, Shunsuke Ohji, Toshiyuki Takahashi, Mitsuhiro Enomoto, Toshiaki Ueno and Kazuyoshi Yagishita

attention, mood improvement, and stress relief. 2 , 3 Moreover, positive correlation between muscle strength of the skeletal muscles and teeth clenching was reported. Sasaki et al 4 reported that teeth clenching force had a positive correlation with isometric gastrocnemius muscle strength. A number of

Full access

Michael Wälchli, Jan Ruffieux,, Audrey Mouthon, Martin Keller and Wolfgang Taube

, as it has been shown previously that BT can improve jump height and explosive force in adults ( 35 ). We hypothesized that older children/adolescents would benefit more from the child-oriented BT, as they use a more mature postural control strategy. Methods The realization of the present study was

Open access

Anna Lina Rahlf, Klaus-Michael Braumann and Astrid Zech

test included 3 maximum contractions (3 s for each contraction) with a rest interval of 3 minutes. The peak torque of the 3-second trial was used to determine the maximum voluntary isometric contraction (MVIC). Subsequently, the best of the 3 trials (highest contraction force) was used for data

Open access

Brad W. Willis, Katie Hocker, Swithin Razu, Aaron D. Gray, Marjorie Skubic, Seth L. Sherman, Samantha Kurkowski and Trent M. Guess

conjunction with force platforms has long been the “gold standard” for determining kinematic and kinetic biomechanical parameters. 3 , 4 Altered lower-extremity kinematic and kinetic parameters demonstrated by females during dynamic jumping tasks have been extensively investigated to assess potential

Open access

reliability measures of the values for the rate of force development were incorrect. The changes to the text and one of the tables in the paper were too extensive to resolve with an erratum, so the paper is retracted, and the amended paper will be published in its entirety in a future issue of IJSPP .

Open access

Kelly Cornett, Katherine Bray-Simons, Heather M. Devlin, Sunil Iyengar, Patricia Moore Shaffer and Janet E. Fulton

in place. Such efforts align with the Community Preventive Services Task Force (Task Force) recommendation for combined approaches that connect activity-friendly routes to everyday destinations. 2 An activity-friendly route is a direct and convenient connection with everyday destinations, offering