نتایج جستجو برای: hamstrings activation

تعداد نتایج: 428225  

Journal: :Journal of sport rehabilitation 2013
Che-Hsiu Chen Tsun-Shun Huang Huei-Ming Chai Mei-Hwa Jan Jiu-Jenq Lin

CONTEXT Recent studies have shown that the static stretch (SS) may adversely affect leg-muscle performance. OBJECTIVES The authors examined the short-term effects of 2 stretching exercises on hamstrings muscle before and after exercise. DESIGN Crossover. SETTING Laboratory. PARTICIPANTS 9 healthy, physically active men. INTERVENTIONS There were 3 protocols in a randomized order with a...

Journal: :The Journal of orthopaedic and sports physical therapy 2010
Tracey Wagner Nazly Behnia Won-Kay Lau Ancheta Richard Shen Shawn Farrokhi Christopher M Powers

STUDY DESIGN Case report. OBJECTIVE To highlight the effects of an intervention program consisting of strengthening and neuromuscular reeducation of the gluteus maximus in an elite triathlete with exercise-associated muscle cramping (EAMC). BACKGROUND Researchers have described 2 theories concerning the etiology of EAMC: (1) muscle fatigue and (2) electrolyte deficit. As such, interventions...

2017
Matt Parr Phil DB Price Daniel J Cleather

OBJECTIVES To evaluate the effect of a gluteal activation warm-up on the performance of an explosive exercise (the high hang pull (HHP)). METHODS Seventeen professional rugby union players performed one set of three HHPs (with 80% of their one repetition maximum load) following both a control and activation warm-up. Peak electrical activity of the gluteus maximus and medius was quantified usi...

Journal: :Journal of biomechanics 2001
D G Lloyd T S Buchanan

In this paper we studied how subjects activate their muscles in response to static varus and valgus loads at the knee. The muscles' contributions to the external moments were estimated using an EMG driven biomechanical model of the knee. The individual muscle activation and loading patterns were examined to identify the strategies that the nervous system uses to support varus and valgus knee mo...

Journal: :Gait & posture 2006
Allison S Arnold May Q Liu Michael H Schwartz Sylvia Ounpuu Scott L Delp

Persons with cerebral palsy frequently walk with excessive knee flexion during terminal swing and stance. This gait abnormality is often attributed to "short" or "spastic" hamstrings that restrict knee extension, and is often treated by hamstrings lengthening surgery. At present, the outcomes of these procedures are inconsistent. This study examined whether analyses of the muscle-tendon lengths...

Journal: :Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology 2009
Anne Schmitz Amy Silder Bryan Heiderscheit Jane Mahoney Darryl G Thelen

Previous studies have identified differences in gait kinetics between healthy older and young adults. However, the underlying factors that cause these changes are not well understood. The objective of this study was to assess the effects of age and speed on the activation of lower-extremity muscles during human walking. We recorded electromyography (EMG) signals of the soleus, gastrocnemius, bi...

Journal: :Scandinavian journal of medicine & science in sports 2016
M N Bourne D A Opar M D Williams A Al Najjar A J Shield

This study aimed to determine: (a) the spatial patterns of hamstring activation during the Nordic hamstring exercise (NHE); (b) whether previously injured hamstrings display activation deficits during the NHE; and (c) whether previously injured hamstrings exhibit altered cross-sectional area (CSA). Ten healthy, recreationally active men with a history of unilateral hamstring strain injury under...

Journal: :Clinical orthopaedics and related research 2010
Jennifer E Stevens-Lapsley Jaclyn E Balter Wendy M Kohrt Donald G Eckhoff

BACKGROUND/RATIONALE Although TKA reliably reduces pain from knee osteoarthritis, full recovery of muscle strength and physical function to normal levels is rare. We presumed that a better understanding of acute changes in hamstrings and quadriceps muscle performance would allow us to enhance early rehabilitation after TKA and improve long-term function. QUESTIONS/PURPOSES The purposes of thi...

Journal: :Clinical biomechanics 2011
John J Elias Marcus S Kirkpatrick Archana Saranathan Saandeep Mani Laura G Smith Miho J Tanaka

BACKGROUND Hamstrings loading has previously been shown to increase tibiofemoral posterior translation and external rotation, which could contribute to patellofemoral malalignment and elevated patellofemoral pressures. The current study characterizes the influence of forces applied by the hamstrings on patellofemoral kinematics and the pressure applied to patellofemoral cartilage. METHODS Ten...

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