جستجوی مقالات مرتبط با کلیدواژه "isometric strength" در نشریات گروه "پزشکی"

Pronation distortion syndrome is one of the most common abnormalities in the body that causes distortions in the structures parts of the lumbar-pelvic and lower limb. The purpose of this study was to determine the effect of corrective exercises with a new approach on the isometric strength of the lower body muscles in people with pronation distortion syndrome.

In this semi experimental research, 30 volunteers who had pronation distortion syndrome were selected and randomly divided into two groups of control (Mean±standard deviation, age: 12.6±1.8 year, height: 166.4±9.6 cm, body mass: 68.6±9.9 kg, body mass index: 24.7±2.2 kg/m2) and experimental (Mean±standard deviation, age: 12.6±1.7 year, height: 165.3±6.6 cm, body weight: 67.1±5.7 kg, body mass index: 24.55±1.6 kg/m2). Experimental group, performed corrective exercises with a new approach for 12 weeks (3 sessions per week for one hour), but control group performed the routine and normal exercise. Before and after 12 weeks performing exercises, the isometric strength of the lower body muscles (digital dynamometer) were evaluated. For data analysis, repeated measures ANOVA with Bonferroni post hoc test at 5% error level was used (p < 0.05).

The experimental group after 12 weeks of corrective exercises with a new approach showed significant improvements in the isometric strength of the lower body muscles (p < 0.001), But in control group there was no significant difference (p>0.05). In addition, after the intervention, the isometric strength of the lower trunk muscles was significantly higher in the experimental group (p < 0.001), but this difference was not significant in the pre-test (p >0.05).

It seems that corrective exercises with a new approach improve isometric strength of the lower body muscles in people with pronation distortion syndrome, so it is recommended for these people.

Frequent throwing movements can change its muscular balance strength, the range of motion and shoulder joint positioning. However, the balance of muscular strength, the range of motion and positioning are essential factors in injury prevention. On the other hand, Proprioception is a type of feedback from limbs to Central nervous system which defines a sensory tool to contribute position sense and movement sense. The purpose of this study was to Comparison of Isometric strength, range of motion and repositioning error shoulder between basketball player disabled and Non-athlete disabled. This is a Causal-comparative study. Convenience sampling was used to recruit the participants.  The participants selected from among disabled athletes and non-athletes with disabilities. A questionnaire distributed to athletic and nonathletic wheelchair-dependent populations. Sixteen man basketball players disabled (Mean and standard deviation age: 24.64±4.06 (Years), Weight: 66.33±5.12(kg), Sitting height: 79.21±7.04(cm), Years of wheelchair use:11.21±3.20 (Years), Sports activity per week:10.23±4.01(watch), Sixteen man Non athletic disabled Wheelchair Users (Mean and standard deviation age:26.25±2.02 (Years), Weight: 69.35±4.12(kg), Sitting height: 82.65±8.15(cm), Years of wheelchair use: 13.01±2.28(Years), subjects were recruited to participate in this study. In order to assess isometric strength internal rotators shoulder joints, Range of motion shoulder joints Abduction, Range of motion shoulder External Rotation joints and repositioning error shoulder joints of the subject, A hand-held Dynamometer and the  Universal Goniometer was used for measuring. The data were analyzed using independent samples t-test (p≤0.05). The results showed independent samples t-test (p≤0.05) a Significant differences between basketball player disabled and Non athlete disabled were found in isometric strength internal rotators shoulder joints, Range of motion shoulder joints Abduction, Range of motion shoulder External Rotation joints and repositioning error shoulder joints (0.001), (0.001), (0.001), (0.001). So that the disabled basketball players had isometric strength internal shoulder joints, isometric strength external shoulder joints, Range of motion shoulder Abduction joints, Range of motion shoulder External Rotation joints and repositioning error shoulder joints than non-athletes with disabilities. The results also showed that isometric strength external rotation joints in the level of (p≤0.05).there is no significant difference between basketball player disabled and Non-athlete disabled (p≤0.05). Also, the results of the study showed that the isometric strength internal rotators of the shoulders joints of the basketball players was higher than that of isometric strength external rotators joints (p≤0.05). Also, there was a significant difference between repositioning error shoulder joints in basketball player disabled and Non-athlete disabled (0.001). Basketball is the non-contact sport that needs to the eye and hand coordination, as our results showed that the muscular strength, the range of motion and shoulder repositioning error decreased in athletics-related to non-athletic subjects, the mentioned sport (Basketball) may improve muscular strength, a range of motion and shoulder repositioning error. Since The disability may be associated with functional impairments and the fact that exercise can reduce disability and maintain the function of individuals, So Designing preventive programs for controlling and limiting this risk factor should be one the main concerns of trainers and medical stuff.

The risk of arthritis increases with age. Knee arthritis causes pain and inflammation of this joint. These side effects can possibly affect muscle strength and performance.
The purpose of this study was to compare the knee flexor and extensor muscles isometric strength and functional performance between healthy and knee arthritis men.
This case-control study was conducted in Isfahan (2015) on knee arthritis male patients (case group, n=22) and healthy male (control group, n=22). The isometric strength of knee flexor and extensor muscles was measured by dynamometer. Functional ability was assessed with using stair ascending and descending, 5 time sit-to-stand and timed up and go tests. Data were analyzed by independent t test.
Findings: Mean age of patients and control groups were 52.6±6.27 and 49.8±4.19, respectively. The knee flexor and extensor muscles strength in patients was significantly less than healthy peoples (P Weaker knee muscle strength and functional performance in patients with knee osteoarthritis compared with healthy adults show that rehabilitation and sports medicine professionals should consider special exercises for improving knee flexor and extensor muscles strength and functional performance in designing treatment protocols for these cases.

Foot alignment has an effect on movements of proximal joints and bones. According to the kinematic chain theory, weakness in function of one motor segment can have an effect on other motor segments. Therefore, the purpose of this study is investigate the relation of pelvic tilt and lumbar lordosis with strength of lumbar-pelvic girdle muscles in athletes with ankle pronation deformity in standing position. In this study, 53 male with ankle pronation deformity were recruited with age of 23.2±2.27 years, height of 169±6.76 and weight of 67.2±6.47. Isometric strength of muscles by handle dynamometer, pelvic tilt by pelvic inclinometer, lumbar lordosis by flexible ruler and foot pronation by navicular drop were investigated. Data were analyzed by statistical methods of correlation between variables. There were significant relations between isometric strength of femur flexor muscles and lumbar lordosis angle (p=0.003, r=0.59) and also between pelvic tilt and lumbar lordosis angle (p=0.012, r=0.46) in participants with ankle pronation deformity. No significant relation was found between other variables of the research (p≥0.05). The positive and significant relation of femur flexor muscles strength with lumbar lordosis and also pelvic tilt with lumbar lordosis may be due to the postural compensatory strategy in persons with ankle pronation deformity. To further explore the relation between these changes in posture alignment and injury more investigations are needed.

Rehabilitation interventions have significant role in reducing the disabilities of Down syndrome. Due to great role of balance in the function of individuals particularly in Activity of Daily Living and the effect of strength on balance، the aim of this study was to investigate the effects of Progressive Resistive Exercise on functional balance in children with Down syndrome.

Fifteen girls children aged between 8 and 12 years، with Down syndrome participated in this study by available sampling method. The subjects participated three times per week in a six-week progressive strengthening program. During intervention، 3 of them excluded. Balance were measured by Berg Balance Scale and right/left hip abductor and flexor، knee extensor and flexor muscles isometric strengths were measured by Nickolas hand-held dynamometer. Paired-sampled T-Test was used for data analysis.

The results of this study showed that the mean of functional balance and muscles isometric strengths were significantly increased after intervention (P<0. 001).

It seems that the results of this study confirm the effect of progressive resistance training on progressing functional balance، and 8-12 years old children with Down syndrome can benefit from these exercises.

The purpose of this study is to evaluate the intra-rater reliability of measuring isometric strength of shoulder muscles in healthy subjects and patients with neck pain. a total of 12 healthy subjects (mean age، 28. 08 ± 4. 35 years) and 12 patients with neck pain (mean age، 29. 45 ± 5. 46 years) voluntarily participated in the present study. Participants sat on a custom-made chair while they were putting their forearms on the arm rest and applying forces to the loadcell in 6 directions of the shoulder joint to reach their maximal voluntary contractions. One examiner took tests in 2 separated days 4 to 7 days apart. To assess the reliability of measuring isometric strength of shoulder muscles، ICC، SEM and SDD were assessed. The results of our study showed ICCs ranged from 0. 84 to 0. 99 in healthy subjects and ranged from 0. 66 t0 0. 95 in patients with neck pain showing high reliability of this method in both groups. The intra-rater reliability of measuring isometric strength of shoulder muscles by the custome-made chair in the present study is a highly reliable method forboth clinical and research applications.