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Leg stiffness

Eun Young Han, Sang Hee Im, Bo Ryun Kim, Min Ji Seo, Myeong Ok Kim
OBJECTIVE: Brachial-ankle pulse wave velocity (baPWV) evaluates arterial stiffness and also predicts early outcome in stroke patients. The objectives of this study were to investigate arterial stiffness of subacute nonfunctional ambulatory stroke patients and to compare the effects of robot-assisted gait therapy (RAGT) combined with rehabilitation therapy (RT) on arterial stiffness and functional recovery with those of RT alone. METHOD: The RAGT group (N = 30) received 30 minutes of robot-assisted gait therapy and 30 minutes of conventional RT, and the control group (N = 26) received 60 minutes of RT, 5 times a week for 4 weeks...
October 2016: Medicine (Baltimore)
Panagiotis Pappas, Giorgos Dallas, Giorgos Paradisis
In research, the accurate and reliable measurement of leg and vertical stiffness could contribute to valid interpretations. The current study aimed at determining the intra-participant variability (i.e. intra-day and inter-day reliabilities) of leg and vertical stiffness, as well as related parameters, during high speed treadmill running, using the "sine-wave" method. Thirty-one males ran on a treadmill at 6.67 m∙s(-1), and the contact and flight times were measured. To determine the intra-day reliability three 10-s running bouts with 10-min recovery were performed...
October 13, 2016: Journal of Applied Biomechanics
Marie Bagger Bohn, Annemette Krintel Petersen, Dennis Brandborg Nielsen, Henrik Sørensen, Martin Lind
BACKGROUND: Anterior cruciate ligament (ACL) deficiency leads to altered stability of the knee. The purpose of this study was to compare the dynamic, rotational stability of the knee, expressed as rotational stiffness, between anterior cruciate ligament-deficient (ACLD) knees, their contralateral intact knees (ACLI) and a knee healthy control group during walking, running and 90° pivoting. We hypothesized a larger tibial internal rotation, a smaller knee joint external moment and a lower rotational stiffness in the ACLD group compared to the ACLI and the control group...
December 2016: Journal of Experimental Orthopaedics
Petra Marsico, Amir Tal-Akabi, Hubertus J A van Hedel
BACKGROUND: In children with cerebral palsy (CP), stiffness, caused by contractile and non-contractile structures, can influence motor performance. This study sought to determine whether the nerve mobility had a relevant impact on motor performance in children with CP. We hypothesized that a positive Straight Leg Raise (SLR) test, as well as smaller SLR hip angle, would relate to lower leg muscle strength, reduced motor capacity and less motor performance in children with CP. METHODS: We applied a cross-sectional analysis on data including SLR, leg muscle strength, Gross Motor Function Measure (GMFM-66) and number of activity counts during daily life from thirty children with CP (6-18 years)...
October 7, 2016: BMC Neurology
Gaspare Pavei, Elena Seminati, Jorge Ll Storniolo, Leonardo A Peyré-Tartaruga
We compared running mechanics parameters determined from ground reaction force (GRF) measurements with estimated forces obtained from double differentiation of kinematic (K) data from motion analysis in a broad spectrum of running speeds (1.94-5.56 m·s(-1)). Data were collected through a force-instrumented treadmill and compared at different sampling frequencies (900 and 300 Hz for GRF, 300 and 100 Hz for K). Vertical force peak, shape, and impulse were similar between K methods and GRF. Contact time, flight time and vertical stiffness (kvert) obtained from K showed the same trend as GRF with differences <5%, whereas leg stiffness (kleg) was not correctly computed by kinematics...
October 5, 2016: Journal of Applied Biomechanics
Kurt L Mudie, Amitabh Gupta, Simon Green, Hiroaki Hobara, Peter J Clothier
This study assessed the agreement between Kvert calculated from four different methods of estimating vertical displacement of the centre of mass (COM) during single-leg hopping. Healthy participants (N=38) completed a 10 s single-leg hopping effort on a force plate, with 3D motion of the lower limb, pelvis and trunk captured. Derived variables were calculated for a total of 753 hop cycles using four methods including: double integration of the vertical ground reaction force, law of falling bodies, a marker cluster on the sacrum and a segmental analysis method...
October 5, 2016: Journal of Applied Biomechanics
Hiroyuki Oda, Kanae Sano, Yoko Kunimasa, Paavo V Komi, Masaki Ishikawa
BACKGROUND: Patients who have had an Achilles tendon (AT) rupture repaired are potentially at higher risk for re-rupture than those without previous rupture. Little attention has been given to the neuromechanical modulation of muscle-tendon interaction and muscle activation profiles during human dynamic movements after AT rupture repair. OBJECTIVE: The purpose of this study was to examine muscle-tendon behavior and muscle activation during bilateral hopping. METHODS: We enrolled nine subjects who had undergone surgical repair of unilateral AT rupture within the past 1-2 years...
October 3, 2016: Sports Medicine
Rachel K Voss, Yi-Ju Chiang, Kate D Cromwell, Diana L Urbauer, Jeffrey E Lee, Janice N Cormier, Chee-Chee H Stucky
BACKGROUND: Occupational symptoms and injuries incurred over a surgical career are underreported yet impact daily surgical practice. We assessed the frequency, consequences, and risk factors for occupational injury in oncologic surgeons and evaluated the feasibility of intraoperative foot mat use to mitigate occupational symptoms. STUDY DESIGN: Oncologic surgeons completed a survey of demographic information and occupational symptoms and injuries. Multivariate logistic regression was used to identify factors associated with occupational symptoms and injuries...
September 29, 2016: Journal of the American College of Surgeons
Teng Maëlys, Gilberte Robain, Samy Bendaya
OBJECTIVE: Sacral neuromodulation is usually used to treat non-obstructive urinary retention when other forms of treatment have failed. An improvement greater than 50% in urinary symptoms after 40months of follow-up has been shown: - moreover, it also has few complications: infections, technical failures, discomfort; - we report a case of dystonia of the lower limb, appeared after sacral neuromodulation implantation. OBSERVATIONS: MMP is a 16-year-old boy with early puberty as noteworthy medical history...
September 2016: Annals of Physical and Rehabilitation Medicine
Kathleen Hartwich, Alejandro Lorente Gomez, Jaroslaw Pyrc, Radosław Gut, Stefan Rammelt, René Grass
BACKGROUND: We performed a biomechanical comparison of 2 methods for operative stabilization of pronation-abduction stage III ankle fractures; group 1: Anterior-posterior lag screws fixing the posterior tibial fragment and lateral fibula plating (LSLFP) versus group 2: locked plate fixation of the posterior tibial fragment and posterior antiglide plate fixation of the fibula (LPFP). METHODS: Seven pairs of fresh-frozen osteoligamentous lower leg specimens (2 male, and 5 female donors) were used for the biomechanical testing...
September 26, 2016: Foot & Ankle International
Ahmad Oryan, P Sharifi, Ali Moshiri, Ian A Silver
AIM OF THE STUDY: Large tendon defects involving extensive tissue loss present complex clinical problems. Surgical reconstruction of such injuries is normally performed by transplanting autogenous and allogenous soft tissues that are expected to remodel to mimic a normal tendon. However, the use of grafts has always been associated with significant limitations. Tissue engineering employing artificial scaffolds may provide acceptable alternatives. Gelatin is a hydrolyzed form of collagen that is bioactive, biodegradable and biocompatible...
September 23, 2016: Connective Tissue Research
Ríona Ní Ghriallais, Kevin Heraty, Bob Smouse, Martin Burke, Paul Gilson, Mark Bruzzi
PURPOSE: To quantify the deformation behavior of the diseased femoropopliteal segment and assess the change to deformation behavior due to various stent placements. METHODS: The length and curvature changes of 6 femoropopliteal segments (the right and left superficial femoral and popliteal arteries) from 3 cadavers were measured in 3-dimensional space based on rotational angiography image data in straight leg and flexed hip/knee (50°/90°) positions before and after placement of nitinol stents of varying type (EverFlex, Misago, and BioMimics 3D) and length (60, 100, and 200 mm) in different locations along the arteries...
September 19, 2016: Journal of Endovascular Therapy
Yuki Imaizumi, Kazuo Eguchi, Toshiki Kaihara, Kumiko Urano, Rieko Shinagawa, Minoru Araki, Koji Inoue, Koichiro Hokao, Yuka Tsujita, Takuya Furusawa, Ryuichiro Kaku, Kazuomi Kario
OBJECTIVE: We tested the hypothesis that sarcopenia, an age-related loss of skeletal muscle mass and function, is associated with arterial stiffness in patients with diabetes (DM). DESIGN AND METHOD: We studied 65 hypertensives in the Real BP study, an observational study of home BP telemonitoring system. As parameters of sarcopenia, we used locomotive syndrome scale, circumference of the wrist, lower leg, and thigh (10 cm above the patella), grip strength, and 6 minute-walk test...
September 2016: Journal of Hypertension
Dimitris Vlachopoulos, Alan R Barker, Craig A Williams, Sigurbjörn A Arngrímsson, Karen M Knapp, Brad S Metcalf, Ioannis G Fatouros, Luis A Moreno, Luis Gracia-Marco
PURPOSE: Exercise is an effective approach for developing bone mass and adolescence is a key period to optimize bone health. However, sports specific training may have different effects on bone outcomes. This study examined the differences on bone outcomes between osteogenic (football) and non-osteogenic (swimming and cycling) sports and a control group in adolescent males. METHODS: One hundred twenty one males (13.1±0.1 years) were measured: 41 swimmers, 37 footballers, 29 cyclists and 14 controls...
September 14, 2016: Medicine and Science in Sports and Exercise
Jane M Black, Eric J Stöhr, Keeron Stone, Christopher J A Pugh, Mike Stembridge, Rob Shave, Joseph I Esformes
Arterial wall mechanics likely play an integral role in arterial responses to acute physiological stress. Therefore, this study aimed to determine the impact of low and moderate intensity double-leg press exercise on common carotid artery (CCA) wall mechanics using 2D vascular strain imaging. Short-axis CCA ultrasound images were collected in 15 healthy men (age: 21 ± 3 years; stature: 176.5 ± 6.2 cm; body mass; 80.6 ± 15.3 kg) before, during, and immediately after short-duration isometric double-leg press exercise at 30% and 60% of participants' one-repetition maximum (1RM: 317 ± 72 kg)...
September 2016: Physiological Reports
Bastiaan Breine, Philippe Malcolm, Ine Van Caekenberghe, Pieter Fiers, Edward C Frederick, Dirk De Clercq
This study assessed kinematic differences between different foot strike patterns and their relationship with peak vertical instantaneous loading rate (VILR) of the ground reaction force (GRF). Fifty-two runners ran at 3.2 m · s(-1) while we recorded GRF and lower limb kinematics and determined foot strike pattern: Typical or Atypical rearfoot strike (RFS), midfoot strike (MFS) of forefoot strike (FFS). Typical RFS had longer contact times and a lower leg stiffness than Atypical RFS and MFS. Typical RFS showed a dorsiflexed ankle (7...
September 13, 2016: Journal of Sports Sciences
Ayse Nur Sirin Ozcan, Sinan Tan, Nuray Gulden Tangal, Saliha Cıracı, Savas Kudas, Suleyman Bulent Bektaser, Halil Arslan
AIMS: The comparison of elastographic features of quadriceps and patellar tendons in a group of professional athletes and healthy volunteers and the description of elasticity characteristics of these tendons. MATERIAL AND METHODS: Thirty-nine professional athletes (22 male, 17 female; mean age 18.5 years) and 35 healthy volunteers (21 male, 14 female; mean age 19 years) were included. They were divided into two groups by gender. Quadriceps tendon, patellar side of the patellar tendon, and tibial side of the patellar tendon elasticity patterns and strain ratios were investigated with real-time ultrasound elastography...
September 2016: Medical Ultrasonography
Thibault Lussiana, Cyrille Gindre, Kim Hébert-Losier, Yoshimasa Sagawa, Philippe Gimenez, Laurent Mourot
PURPOSE: There is no unique or 'ideal' running pattern that is the most economical for all runners. Classifying the global running patterns of individuals into two categories (aerial and terrestrial) using the Volodalen® method could permit a better understanding of the relationship between running economy (RE) and biomechanics. The main purpose was to compare RE between aerial and terrestrial runners. METHODS: Two coaches classified 58 runners into aerial (n=29) or terrestrial (n=29) running patterns on the basis of visual observations...
September 6, 2016: International Journal of Sports Physiology and Performance
Keiichi Yoshida, Yoshiaki Itoigawa, Yuichiro Maruyama, Yoshitomo Saita, Yuji Takazawa, Hiroshi Ikeda, Kazuo Kaneko, Tatsuo Sakai, Toru Okuwaki
INTRODUCTION: Muscle strain of the gastrocnemius medial head mainly occurs at the musculotendinous junction (MTJ), and stiffness is a risk factor. Shear wave elastography (SWE) measures elasticity by determining the propagation velocity. The aim of this study was to measure the elasticity of the normal muscle and aponeurosis in the MTJ of the gastrocnemius medial head using SWE, thus obtaining information relevant to muscle strain at this point. MATERIALS AND METHODS: Forty-one volunteers (82 legs) were recruited and the gastrocnemius medial heads were examined at four points: three on the aponeurosis, namely at the center of the MTJ (Central), 10 mm proximal to it (Proximal) and 10 mm distal to it (Distal); and at one on the muscle belly (Muscle)...
September 4, 2016: Clinical Anatomy
Katie A Ewing, Justin W Fernandez, Rezaul K Begg, Mary P Galea, Peter V S Lee
Anterior cruciate ligament (ACL) injury can be a painful, debilitating and costly consequence of participating in sporting activities. Prophylactic knee bracing aims to reduce the number and severity of ACL injury, which commonly occurs during landing maneuvers and is more prevalent in female athletes, but a consensus on the effectiveness of prophylactic knee braces has not been established. The lower-limb muscles are believed to play an important role in stabilizing the knee joint. The purpose of this study was to investigate the changes in lower-limb muscle function with prophylactic knee bracing in male and female athletes during landing...
August 27, 2016: Journal of Biomechanics
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