Different Types Of Grip Research Articles

A system of training tools for variable technical and tactical actions of young freestyle wrestlers

The analysis of the researches of domestic specialists made it possible to determine a system of effective means of training variable technical and tactical actions of young freestyle wrestlers, namely: components of training variable technique of throwing with a mill, methods of tactical preparation, as well as tools that ensure the implementation of this technique depending on the variability of "entry into reception", different methods of tactical training, different types of grips and various starting positions. As a result of the conducted research, a method of training variable technical and tactical actions of young freestyle wrestlers was developed, which includes: components of training variable technique of throwing with a mill, methods of tactical preparation, as well as means that ensure the implementation of this technique depends on the variability of the "entry into the technique", various methods of tactical training, different types of grips, various starting positions. Here are some provisions of the developed experimental method of teaching variable technical and tactical actions of young freestyle wrestlers. The attacker, having grabbed the opponent's different hand by the wrist, the other - by the shoulder, from the inside begins to perform the translation with a jerk. Releasing the wrist and placing the far leg forward between the opponent's legs, and putting the near one on the knee, the attacker dives under the opponent's chest so that his shoulder blades are completely covered by the opponent's chest, all the while continuing to pull his arm of the same name on his neck. With the free hand, grab the hip of the same name from the inside and, pushing off with the front leg to the side, the attacker tears the opponent off the carpet and throws him over the shoulders in the direction of the grabbed arm.

PATIENT-REPORTED OUTCOMES FOR USE OF SILVERSPLINTS IN OSTEOARTHRITIS OF THE HAND.

Pain, stiffness and joint deformity can result in significantly reduced hand function in people with osteoarthritis. Characteristic finger deformities in osteoarthritis are swan neck deformity and boutonnière deformity. Several studies have reported that an orthosis decreases pain and increases function during daily activities for patients with arthritis. The aim of this study was to review patient-reported outcomes of current conservative therapeutic management with silver ring splints (silversplints) for patients with osteoarthritis of the hand. There was a 76% improvement in overall daily functioning and a 74% reduction in pain. Several questions concerned daily activities with different types of hand function and with different types of grip and use of fingers. The results show a major improvement in both the more open grip of the hand and activities requiring fine motor skills. The ability to use force with the hand, even when wearing an orthosis, is an important result. Patients who experienced “no problems or minor problems” had significantly increased functioning in several activities of daily living, but the largest improvement in functioning was seen in “household chores” (243%), “opening jars” (150%) and “lifting groceries” (143%). Overall, silversplints appear to serve as a suitable support for the joints in osteoarthritis of the hand, providing pain relief by preventing the joint from moving through its full range of motion. Use of silversplints to treat patients with osteoarthritis of the hand should be considered as a useful, non-surgical method.LAY ABSTRACTThis study of patient-reported outcome measures regarding the use of silversplints for osteoarthritis of the hand provides insight into the additional care and quality of life provided by the use of an orthopaedic medical aid. The aims of this study are to measure the effectiveness of silversplints in daily life and to validate the efficacy of using orthopaedic medical aids. Between October 2018 and June 2020, a total of 2,231 patients with osteoarthritis were provided with silversplints and were asked about the effectiveness of the splints 3 weeks after they first started wearing them. This large-scale study found that the use of silversplints contributed to overall daily functioning, reduced pain, and increased the possibility of performing daily activities. Silversplints appear to serve as a suitable support for joints, providing pain relief and freedom of movement, but preventing the joint from moving through its full range of motion.

Tactile Signatures and Hand Motion Intent Recognition for Wearable Assistive Devices.

Within the field of robotics and autonomous systems where there is a human in the loop, intent recognition plays an important role. This is especially true for wearable assistive devices used for rehabilitation, particularly post-stroke recovery. This paper reports results on the use of tactile patterns to detect weak muscle contractions in the forearm while at the same time associating these patterns with the muscle synergies during different grips. To investigate this concept, a series of experiments with healthy participants were carried out using a tactile arm brace (TAB) on the forearm while performing four different types of grip. The expected force patterns were established by analysing the muscle synergies of the four grip types and the forearm physiology. The results showed that the tactile signatures of the forearm recorded on the TAB align with the anticipated force patterns. Furthermore, a linear separability of the data across all four grip types was identified. Using the TAB data, machine learning algorithms achieved a 99% classification accuracy. The TAB results were highly comparable to a similar commercial intent recognition system based on a surface electromyography (sEMG) sensing.

Social Motor Priming: when offline interference facilitates motor execution.

Many daily activities involve synchronizing with other people’s actions. Previous literature has revealed that a slowdown of performance occurs whenever the action to be carried out is different to the one observed (i.e., visuomotor interference). However, action execution can be facilitated by observing a different action if it calls for an interactive gesture (i.e., social motor priming). The aim of this study is to investigate the costs and benefits of spontaneously processing a social response and then executing the same or a different action. Participants performed two different types of grips, which could be either congruent or not with the socially appropriate response and with the observed action. In particular, participants performed a precision grip (PG; thumb-index fingers opposition) or a whole-hand grasp (WHG; fingers-palm opposition) after observing videos showing an actor performing a PG and addressing them (interactive condition) or not (non-interactive condition). Crucially, in the interactive condition, the most appropriate response was a WHG, but in 50 percent of trials participants were asked to perform a PG. This procedure allowed us to measure both the facilitator effect of performing an action appropriate to the social context (WHG)—but different with respect to the observed one (PG)—and the cost of inhibiting it. These effects were measured by means of 3-D kinematical analysis of movement. Results show that, in terms of reaction time and movement time, the interactive request facilitated (i.e., speeded) the socially appropriate action (WHG), whereas interfered with (i.e., delayed) a different action (PG), although observed actions were always PGs. This interference also manifested with an increase of maximum grip aperture, which seemingly reflects the concurrent representation of the socially appropriate response. Overall, these findings extend previous research by revealing that physically incongruent action representations can be integrated into a single action plan even during an offline task and without any training.

Improvement of handle grip using reverse engineering, CAE and Rapid Prototyping

The overwhelming majority of manual operations is even nowadays performed by using manual hand tools. These tools can be divided into 2 groups – hand tools designed for general use or a single-purpose hand tools for special operations. Tool described in this paper is used in assembling operation in the completion of electric motor. During the design of the existing tools the requirements for a functional part of the tool (lifespan, inability to damage the engine installation) were fully considered, demands for ergonomic grip area, however, were not taken into account. Long-term use of incorrectly designed tool causes carpal tunnel syndrome, hand-arm vibration syndrome, diminished sensitivity or tingling in the fingers of workers. These difficulties can be reduced or entirely eliminated due to proper design of the grip of hand tool. Most authors focus on adjusting the grip for optimum ergonomics at individual types of grips (cylindrical, palmar, lateral, etc.). However, as already mentioned, there are tools for specific operations when the working area is limited by space or a specific type of load on the grip is needed. In some cases, it is often necessary to change the type of grip or combine different types of grips. This paper describes the design of an optimal grip of hand tool used for specific operation when assembling motors. Design of prototype mold and production of functional prototypes for ergonomics assessment directly in the workplace were realized. New design of handle should reduce the risk primarily of developing carpal tunnel in long-term use.

Finger load distribution in different types of climbing grips

When holding small ledges, rock climbers use different types of grips, such as the closed and open crimp grip and the open handgrip. A measurement device consisting of four tri-axial force transducers was developed in this study, which can be mounted on a climbing wall and measures the individual vertical and normal finger forces. The finger load distribution of the three grips was measured in climbers when ascending a route, and the normal and friction forces as well as the coefficient of friction were compared between the four fingers and three grips. In the closed crimp, the normal force of the index finger dominates over all other fingers, followed by the middle, ring and little fingers. In the open crimp and open handgrip, the normal force of the middle finger is the largest, followed by equal forces in index and ring fingers, and the little finger with the smallest normal force. The coefficients of friction in the index finger in closed and open crimps are similar, yet far larger compared to the ope...

Are cutout handles used when available in real occupational settings? Description of grips and upper extremities movements during industrial box handling

In order to achieve better postures and decrease musculoskeletal risks adequate design of hand/box couplings for manual materials handling (MMH) are still needed. No studies evaluating upper limb movement thorough direct measurements during box handling in workplace were identified in the literature. In this study we describe the types of grip and movements adopted by ten workers when handling redesigned boxes with cutout handles between different heights on industrial pallets. The new handles were used by 90% of the workers through different types of grip. Electrogoniometric measurements showed relatively safe forearm and wrist movements, although elbow inadequate range of movement was recorded. Despite the good acceptance of the cutout by workers, the new design requires extra internal space in the boxes reducing applications for this alternative of box.

ASSESSMENT OF GRIP FORCE CONTROL IN PATIENTS WITH MUSCULAR DYSTROPHY

Background. The majority of hand functionality tests are based on qualitative assessment which largely depends on the experience of the therapist. Computer-assisted methods can provide more objective and accurate measurements of the grip force and other parameters related to grasping. Methods. We analysed the grip force control in 12 patients with muscular dystrophy using the tracking system developed. The system consists of a grip-measuring device with endobjects assessing the force applied in different grips. The device was used as input to a tracking task where the patient applied the grip force according to the visual feedback from the computer screen. Each patient performed two tasks which consisted of tracking a ramp and sinus target. Results. We analysed the maximal grip force as assessed in the ramp task and the tracking accuracy of the sinus task. The results are compared among five different grips (cylindrical, lateral, palmar, pinch and spherical grip), applied with dominant and non-dominant hand. The results show no significant difference in tracking accuracy between the dominant and non-dominant hand. Conclusions. The results obtained in tracking the ramp target showed that the method could be used for the assessment of the muscle fatigue, providing quantitative information on muscle capacity. The results of the sinus-tracking task showed that the method can evaluate the grip force control in different types of grips, providing information on hand dexterity, muscle activation patterns or tremor.

Effect of putting grip on eye and head movements during the golf putting stroke.

The objective of this article is to determine the effect of three different putting grips (conventional, cross-hand, and one-handed) on variations in eye and head movements during the putting stroke. Seven volunteer novice players, ranging in age from 21 to 22 years, participated in the study. During each experimental session, the subject stood on a specially designed platform covered with artificial turf and putted golf balls towards a standard golf hole. The three different types of grips were tested at two distances: 3 and 9 ft. For each condition, 20 putts were attempted. For each putt, data were recorded over a 3-s interval at a sampling rate of 100 Hz. Eye movements were recorded using a helmet-mounted eye movement monitor. Head rotation about an imaginary axis through the top of the head and its center-of-rotation was measured by means of a potentiometer mounted on a fixed frame and coupled to the helmet. Putter-head motion was measured using a linear array of infrared phototransistors embedded in the platform. The standard deviation (STD, relative to the initial level) was calculated for eye and head movements over the duration of the putt (i.e., from the beginning of the backstroke, through the forward stroke, to impact). The averaged STD for the attempted putts was calculated for each subject. Then, the averaged STDs and other data for the seven subjects were statistically compared across the three grip conditions. The STD of eye movements were greater (p < 0.1) for conventional than cross-hand (9 ft) and one-handed (3 and 9 ft) grips. Also, the STD of head movements were greater (p < 0.1; 3 ft) for conventional than cross-hand and one-handed grips. Vestibulo-ocular responses associated with head rotations could be observed in many 9 ft and some 3 ft putts. The duration of the putt was significantly longer (p < 0.05; 3 and 9 ft) for the one-handed than conventional and cross-hand grips. Finally, performance, or percentage putts made, was significantly better (p <0.05; 9 ft) for cross-hand than conventional grip. The smaller variations, both in eye movements during longer putts and head movements during shorter putts, using cross-hand and one-handed grips may explain why some golfers, based on their playing experience, prefer these over the conventional grip. Also, the longer duration for the one-handed grip, which improves tempo, may explain why some senior players prefer the long-shaft (effectively one-handed grip) putter.

A novel force transducer for the measurement of grip force

A new strain gauge transducer has been developed to measure functional grip forces. The gripping area is a cylinder of diameter 30 mm and length 150 mm and simulates the handle of a number of devices, allowing a range of activities to be studied. The device measures radial forces divided into six components and forces of up to 250 N per segment can be measured with an accuracy of ±1%. The device therefore gives information about the magnitude and distribution of force around the cylinder during gripping, and has been shown to be a valuable research tool in a study of four different types of grip, providing valuable input data for biomechanical models.

Comparison of Baseline Instruments to the Jamar Dynamometer and the B&amp;L Engineering Pinch Gauge

This study compared different types of grip and pinch strength measurement devices to determine their inter-instrument reliability and concurrent validity. The study included 40 females and 40 males who were tested on 2 types of grip and pinch strength measurement devices using a repeated measure design. Results indicated that the Jamar and Baseline hydraulic dynamometers have acceptable inter-instrument reliability and concurrent validity (i.e., they measure grip strength equivalently) and can be used interchangeably. Thus, therapists using the Baseline dynamometer are justified in using published normative data that were collected with the jamar dynamometer. In contrast, Baseline regular and hydraulic pinch gauges did not measure tip, hey, and palmer pinch strength equivalently with the B&amp;L Engineering pinch gauge. As a result, therapists using Baseline pinch gauges are not justified in using published normative data that were collected with the B&amp;L Engineering pinch gauge. Therapists should not interchange different types of grip and pinch strength measurement devices unless there is evidence that they measure equivalently.

Ergonomics evaluation of a foam rubber grip for tool handles

An important consideration in tool design is the avoidance of hand discomfort and a reduction of work efficiency by using proper grip designs. To measure grip force distribution on a tool handle, Force Sensing Resistors were calibrated, placed on two different types of grip (wood and foam) and interfaced to a personal computer. The results, using six common garden tools - loppers, hedge shears, shovels, leaf rakes, hoes, garden rakes - indicated a very uneven distribution in grip force, but with the foam grip providing a more uniform distribution. Unfortunately, in most cases, the tool grip force was greater for the foam grip due to the deformation of the foam and a ‘loss of control’ feeling in the subjects. However, most subjects strongly preferred the foam grips.

Influence of different types of grasping on the transport component of prehension movements

The main aim of the present study was to clarify whether different types of grasping may affect the transport component of prehension movements. To this purpose two experiments were carried out. In the first experiment the kinematics of arm movements (transport and manipulation components) were studied in eight normal subjects instructed to reach and grasp different objects located either 20 or 30 cm from their hand. The objects employed required two different types of grip: prehension with the whole hand and prehension with the index finger and the thumb (precision grip). In the second experiment subjects were instructed to point to the same objects employed in the first experiment. This experiment served as a control for the precision requirements related to the object size. The results showed that, once the precision requirements were taken into account, the transport component remained unmodified with the different types of grip. The time course of the manipulation component and its temporal relations with the transport component changed with the type of grasping. The maximal hand aperture was reached earlier in the precision grip than in the whole hand prehension and the temporal coupling with the transport component was weaker in the former condition than in the latter. The data are interpreted as further evidence in favour of independence between the transport and the manipulation “channels”.

Proposition pour une cotation clinique de la flexion-extension des doigts longs

After many methods of evaluation of the hand function, this last one does not need any measuring of angle nor length because the hand is its own system of reference: the thumb is the scale for the measurement of the flexion and the plane of a table for the extension. The measurements are noted from 5 to 1, from the best to the worst function: so the best hand obtains the best score. The evaluation of off grip between palm and fingers needs cylinders of specified diameters corresponding with common things as pencil or knitting needle, but it is possible to use the opposite hand instead. Adding the measurement of the opposition, it is possible at the end of the examination to fill a hand global function form easy to enter in a computer. The advantage of this method is that it evaluates the result from the patients' point of view: that is to say in terms of different types of grip. It is a global and functional evaluation, easy to use in any circumstances, but other more precise methods may be employed simultaneously for special cases such as results in tendon or joint reconstruction.