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Results 701 - 750 of 778
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Okuda Y - - 1987
To define the matrix composition and architecture of canine flexor tendon, and to correlate tissue structure with applied mechanical loading, five anatomical regions of flexor tendon were studied. Histologically, two prominent fibrocartilaginous areas were observed on concave aspects of the tendon. The location of the major fibrocartilaginous area at the ...
Lanir Y - - 1987
The response of a cartilage disc to unconfined compressive loading under small deformations is analyzed. The cartilage is considered as a transversely isotropic bicomponent (solid-fluid) tissue. Concentration effects (commonly termed osmotic pressure) are accounted for. The tissue's permeability is taken to be isotropic. Its concentration force is assumed to vary ...
Parsons J R - - 1987
The in-vitro viscoelastic mechanical response of normal rabbit articular cartilage is strongly dependent on the quantity and integrity of the proteoglycan fraction of the tissue matrix. Experimental results demonstrate that specific functional relationships exist between shear moduli, retardation time spectra, and proteoglycan content. Quantitative enzymolysis of the proteoglycan fraction of ...
Sallé H J - - 1986
The effect of three kinds of moderate physical loads on the tremor of the middle finger was studied in eight males: cycling 15 min on an ergometer at a heart rate of 140 beats/min (general dynamic load); lifting a mass of 1 kg by the middle finger at a rate ...
Doherty P - - 1986
The effect of an increase in tonicity on the amplitude and frequency of miniature end-plate potentials (m.e.p.p.s) following superfusion of 50 mM- or 100 mM-sucrose-Ringer solution was determined from intracellular recording at end-plates of the frog cutaneous pectoris muscle, in the absence of drugs and using on-line statistical analysis. An ...
Avis F J - - 1986
Negative and positive work performed during leg extension movements of 53 well trained subjects was measured with the help of a special dynamometer. The subjects performed four maximal push off trials against five different loads (25-105 kg): two two-legged extensions from a squatting position (SM) with a knee angle of ...
Miyazaki S - - 1986
We describe a self contained electronic device for controlling the limb loads exerted by patients having one affected foot and using a walking aid. The device measures the limb load with a thin capacitative transducer attached to the sole of the patient's shoe, and operates in two basic modes. In ...
Folman Y - - 1986
The cyclic impacts induced by heel strike when walking were studied using both a high-resonance-frequency force plate and a low-mass skin-mounted accelerometer. The data were computer analyzed. The results showed that during normal human walking, the locomotor system is subjected to repetitive impact loads at heel strike, lasting about 5 ...
Blickhan R - - 1986
The stiffness of the tibia-metatarsus joint of several spider-species was determined for different loading conditions. The relationship between force applied to the metatarsus tip and deflection is linear and free of hysteresis during axial loading (z'), but not under lateral (y') and dorsoventral (x') loading, where joint stiffness increases with ...
Richardson C - - 1985
A series of ballistic, unidirectional arm movements were studied to evaluate the electromyographic (EMG) and neuromuscular force patterns that occur when a limb is unexpectedly perturbed. Multiple training trials were continued with a control load spring attached to the apparatus until a pre-specified criterion for learning was attained. The limb ...
Stormont D M - - 1985
The stabilizing capacity of the ligaments and articular surface in the ankle was determined under defined physiologic loading conditions. The concept of primary and secondary constraints was adapted to the ankle. With physiologic loading, the articular surface accounted for 30% and 100% of stability in rotation and version, respectively. That ...
Nigg B M - - 1985
The study of sports injuries has grown with the increase in importance of sport as a leisure-time activity. The origin of many sports injuries is assumed to be mechanical, with the forces and/or stresses acting on one element of the human locomotor system exceeding the critical limits. This article presents ...
Hall S J - - 1985
Factors affecting compressive and shear forces and torque at the L5/S1 vertebral joint were examined for nine different load/lifting-speed combinations during performances of a dynamic lifting task by 10 subjects. Loads were 40, 60, and 80% of each subject's maximum lifting capability. Target lifting times were 1.5, 3.5, and 7 ...
Goel V K - - 1985
The forces induced in the disc and ligaments of a lumbar motion segment in resisting a quasi-static external load, using a semi-experimental approach, are presented. The lines of action of ligaments (direction cosines) and disc center for the initial position of the specimen were determined using a morphometer. The changes ...
Gibbs C L - - 1985
We studied the effects of amrinone (300 micrograms X ml-1) on the mechanical and energetic outputs of nonfailing rabbit papillary muscles at 27 degrees C using a myothermic technique. Amrinone was found to markedly stimulate the basal (i.e., nonbeating) metabolism. In mechanical experiments, at a 0.5-Hz stimulus rate, amrinone increased ...
Leaver T M - - 1985
A novel particle tracing technique has been used to study the effect of the normal process variables i.e. drum speed, drum loading and the presence/absence of mixing elements (baffles) on the movement of tablets in a side-vented perforated drum (24 in diameter Accela-Cota). The technique involves measuring the duration of ...
Avis F J - - 1985
A dynamometer for measurement under static and dynamic conditions is presented. At different load levels, force, velocity, work and power can be measured in explosive leg extensions. Measurements on 53 subjects at different load levels (0-125.5 kg) were carried out. Peak power ranged from 2611 to 1746 W, force from ...
Yang K H - - 1984
Low-back pain has a complex and multi-faceted etiology. The articular facets have been shown to be load-bearing structures and may be a site for low-back pain. The aim of this paper is to establish the mechanism for the transmission of axial load across a facet joint and to propose a ...
Cappozzo A - - 1984
The longitudinal compressive load acting on the L3-L4 spinal motion segment was investigated during normal level walking for a range of speeds of progression. Forces were predicted using experimental data from photogrammetric measurements of upper body segmental motion and inertial properties, along with a biomechanical model of the trunk. A ...
Scharf S M - - 1984
In 12 anesthetized mongrel dogs the changes in movements of the rib cage (RC) and abdomen (ABD) were studied during inspiratory loading for 15 min. Tracheal (Pm) and transdiaphragmatic (Pdi) pressures increased to 60-65% of their maxima and were maintained for the 15-min period of loading. Analysis of the EMGs ...
Krein S W - - 1984
The bipolar endoprosthesis was designed to alleviate problems encountered with conventional hip endoprostheses. Recent designs have advocated the use of offset centers of rotation between the inner and outer joint-bearing surfaces to generate a valgus-producing moment on loading (antivarus head dynamics). This study was undertaken to justify this biomechanical feature ...
Panjabi M M - - 1984
The purpose of this study was to determine in vitro the centers of rotation of thoracic functional spinal units in the sagittal plane. The center of rotation is a convenient concept and part of a precise method of documenting the kinematics of a joint moving in a plane. Fresh cadaver ...
Connelly G M - - 1984
The relative fatigue crack propagation resistance of plain and carbon fiber-reinforced ultrahigh molecular weight polyethylene (UHMWPE) was determined from cyclic loading tests performed on compact tension specimens machined from the tibial components of total knee prostheses. Both materials were characterized by dynamic mechanical spectroscopy, X-ray diffraction, and differential scanning calorimetry. ...
Daubenspeck J A - - 1983
Breathing pattern responses to small mechanical loads added pseudorandomly to the external airway of human subjects were measured using flow-resistive and elastic loads above and below the threshold for detectability of some subjects. The zeroth lag of the computed cross-correlations between the loading sequence and the various aspects of the ...
France E P - - 1983
An apparatus and experimental technique have been developed which allow the simultaneous quantitation of human cadaver knee ligament forces with the knee in various positions and subjected to various loads. The methodology permits all the major ligaments of the knee to be kept intact, thus preserving much of their normal ...
Omoto M - - 1982
We assumed the possibility of adopting FDP as an index of fatigue and carried out examinations upon various load conditions causing stress. For our observations other indices which are thought effective for fatigue evaluation, such as urine CA, flicker values, response time, Uchida's Kraepelin test, and examination of subjective symptoms ...
Wolf S L - - 1982
The purposes of this investigation were to determine whether the temporal and force measurements from the Krusen Limb Load Monitor produced clinically reliable data and to begin identifying the factors that determine the monitor's reliability. Temporal and loading measurements were made from the output of the Krusen Limb Load Monitor ...
Bulatao-Jayme J - - 1982
The dietary intakes of 90 confirmed primary liver cancer cases were compared against 90 age-sex matched controls. Dietary recall, obtained by the same nutritionist, was taken for each change of residence lasting one year or more. The frequency and amounts of food items consumed were calculated into units of aflatoxin ...
Burr D B - - 1982
One method used to examine the relationship between behavioral strategies and anatomical adaptation is to study the results of mechanical stress associated with a given behavior and compare this with skeletal adaptations to other behaviors. This comparative approach is appropriate for highlighting combinations of features that are specializations to specific ...
Steen J A - - 1982
Most tracheal tubes sold today are arcuate in shape while the human airway is S-shaped. In situ, the tubes exert different forces on the posterior larynx, depending on their stiffness. Laryngeal damage after prolonged intubation is recognized as the result of these forces. The authors tested 8 types of size ...
Gelberman R H - - 1982
The response of healing canine flexor tendons to motion was investigated using protected passive mobilization techniques. Early motion, delayed motion, and immobilization groups were compared over a 12-week period for their strength and excursion characteristics. Tendons which were mobilized early showed progressively greater ultimate load and linear slope values at ...
Woo S L - - 1981
The effects of controlled passive motion on primary tendon repair were studied using the canine forepaw flexor apparatus as experimental model. The animals were divided into seven groups based on duration(3 to 12 weeks post repair) and mode of immobilization and partial mobilization. The repaired tendons were subjected to biomechanical ...
Lee R C - - 1981
The compressive stiffness of articular cartilage was examined in oscillatory confined compression over a wide frequency range including high frequencies relevant to impact loading. Nonlinear behavior was found when the imposed sinusoidal compression amplitude exceeded a threshold value that depended on frequency. Linear behavior was attained only by suitable control ...
Fouke J M - - 1981
Methods of monitoring airway caliber as an indicator of bronchomuscular tone have been indirect, static, and invasive. A diameter transducer has been developed the static and dynamic characteristics of which indicate that it should overcome some methodological problems. The catheter-mounted spring-loaded braces of the transducer track the motion of the ...
Tencer A F - - 1981
A general method is proposed for the testing of the structural properties of lumbar intervertebral joints. The apparatus designed includes a loading jig capable of applying any wrench resultant load while allowing unconstrained motion of the specimen and a three-dimensional displacement transducer for measurement of principal and coupled displacements. Four ...
Ker R F - - 1981
1. The stresses applied during fast locomotion are sufficient to stretch the tendon far into the linear region of the load-extension plot. 2. The tangent modulus in the linear region is about 1.65 GN.m-2 and is independent of frequency for oscillations in the range 0.22 to 11 Hz. 3. Internal ...
Hutton W C - - 1981
Accurate measurements of the vertical load under areas of the foot were made with a computerized instrumentation system. In a study of 148 normal feet, the normal force distribution and its variation with age was quantified. This showed the hallux to be important in sharing the load on the first ...
Rippie E G - - 1981
The processes of nonequilibrium generation and decay of axial and radial stresses within tablet compacts were analyzed in terms of three-dimensional linear viscoelastic theory. A rotary tablet press was instrumented to measure punch and die wall stresses during the compression and postcompression periods. Following compression, tablets were permitted to remain ...
Kohl J - - 1981
The relationship between pedalling- and breathing rhythm was studied in 34 medical students (non-cyclists") and 10 racing cyclists on an electromagnetic bicycle-ergometer, the effective work load of which (50 W, 100 W, 150 W, 200 W) was independent of the pedalling rate. The criteria used were integer p/b ratios (pedalling ...
Chapman A E - - 1980
Subjects performed supination and pronation of the forearm against an inertial load with maximal voluntary effort, from either rest or when arresting the opposite motion of the load (a wind-up). The angular velocities produced at the mid-range of forearm movement were significantly greater with wind-up than without. The angle from ...
Afoke N Y - - 1980
A casting method for measuring the intra-articular space in the loaded hip is described. The results of tests on 22 hips from 22 cadavers show that the joint space is variable both in location and size and can disappear under light loads. It seems likely that the size and shape ...
Ohta Y - - 1980
A method is described for the simultaneous measurements of three dimensional shifts of the gravitational center of the body caused by ventilatory and cardiac motions. The measuring system consists fundamentally of three load cells which support an aluminum die-casting platform. Measurement of the shift towards the X axis (front-to-back) was ...
Lustick S - - 1980
The effect of the angle of incidence on the radiative heat load was determined for light and dark plumage. As the angle of incidence to the solar radiation source increases the difference in heat transfer between light and dark plumage disappears. Thus, by postural adjustment, a dark bird may become ...
Caiozzo V J - - 1980
Previous studies have examined man's ability to produce external power output during maximal repetitive work cycles of short duration. It appears, however, that there were methodological limitations which would inherently mask man's true capacities. Consequently, we examined the effect of variable external loads upon external power output as measured by ...
O'Connor P - - 1980
A device has been designed to permit reproducible loads to be applied perpendicularly to the acutely curved cartilage surfaces of the diarthrodial joints of small animals. With this apparatus, a sharp, round pin has been used to cause splits in the hyaline articular cartilage of the lower end of the ...
Broom N D - - 1980
A direct view has been obtained of the manner in which the fibrous components components and chondrocytes in hyaline cartilage respond to the application of uniaxial tensile loading and plane-strain compressive loading. A micro-mechanical testing device has been developed which inserts directly into the stage of a high-resolution optical microscope ...
Enander A - - 1979
A work physiological study was conducted during three different types of work in cold stores, i.e., at dairies and in the cutting and packaging of meat. Peripheral cooling, especially of the fingers and hands, was noted in all the subjects. The work load was relatively light for the packers but ...
Ramaekers J G - - 1979
The mechanical behaviour of bony material taken from humeral bone of the mallard duck was analysed. Wing-clipping led to a change in the values and distribution of the dynamic shear modulus and damping. The distribution of the values of the modulus shows a specific pattern in which the highest values ...
Vaida I - - 1979
Following our Institute's involvement in the physiology of mining work (since 1953), this paper deals with underground work load investigated in terms of time, energy expenditure and heart rate in coal miners working with various types and degrees of mechanization. Results showed that a chamber coal face and at heading ...
Bennett L - - 1979
Stresses developed within flesh in contact with a cushion are examined analytically. Compressive, tensile, and shear stresses within flesh in proximity to a bone are given as a function of cushion stiffness (major parameter) and the overall Poisson's ratio of flesh (minor parameter). It is shown that an individual already ...
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