جستجوی مقالات مرتبط با کلیدواژه "قدرت عضلانی" در نشریات گروه "پزشکی"

 Exercise-induced adaptations can be influenced by the type of exercise. The aim of the current research was to determine the effect of a period of resistance-interval training versus resistance-aerobic training on insulin-like growth factor-1 [IGF-1] and strength and muscle mass in trained young men.

 In this semi-experimental research, 36 trained male volunteers were selected and divided into three groups: 1] resistance training, 2] resistance-aerobic training, and 3] resistance-interval training. Resistance training was performed in 3 sets, 4 to 6 repetitions with 85% of one-repetition maximum. interval training was performed in 4-6 intervals of 30 seconds of sprinting with 4.5 minutes of recovery. Aerobic exercise was performed with an intensity of 70% of maximum oxygen consumption for 30 minutes.

An increase in muscle strength and muscle mass was observed in the resistance, resistance-periodic and resistance-aerobic groups, respectively, and there was a significant difference between the groups [P < 0.05]. It also showed that the changes in serum IGF-1 for the resistance-interval training group are significant compared to the resistance-aerobic training group) P=0.002(. It also showed that serum IGF-1 changes were significant for resistance-interval training group compared to resistance-aerobic training group [P=0.002].

 As evidenced by the results of this hospital study, an increase in age and BMI are positively related to PSA concentration and prostate volume; nonetheless, no correlation was observed between PSA and prostate volume. BMI and age may be better parameters to estimate PSA concentration and prostate volume.

Competitive sports such as wheelchair basketball for people with disabilities are growing rapidly and are probably one of the most popular sports for people with disabilities. Moreover, the conducted studies have demonstrated that the evaluation of physical performance by field tests in different classes of wheelchair basketball could be very important for the optimal design of training programs to improve the performance of wheelchair basketball players. Furthermore, studies have shown that sports activity positively affects the quality of life of athletes with physical disabilities. In addition, athletes with physical disabilities had a better sense of physical ability and self–esteem. Therefore, the purpose of this research was to determine the effect of a combined plyometric and resistance exercise program on strength and power performance and its relationship with the components of quality of life, general health, physical self–concept, perception of pain, and stress in the female wheelchair basketball players of Iran national team.

In this quasi–experimental and applied study, twenty female athletes who were the Iranian national basketball team members were divided into the control (10 people) and experimental (10 people) groups. Our participants performed combined plyometric and resistance training for 4 weeks in this study. In the present study, the participants warmed up for 10 minutes at the beginning of each session using Circuit Resistance Training. After that, two exercises were performed for each muscle group, including shoulder, chest, back, abdomen, biceps, triceps, forearm, and wrist, with 50% of one maximum repetition, or 1RM, for three sets with 20 repetitions in each set. In the session, plyometric exercises started 10 minutes after finishing resistance exercises. Plyometric exercises, including throwing a 5–kg medicine ball, were performed for two sets with six repetitions in each set. Then, at the beginning and the end of the research, physical performance factors, the 36–Item Short Form Survey (SF–36) (Ware et al., 1993), The McGill Pain Questionnaire (MPQ) (Melzack, 1987), the World Health Organization Quality–of–Life Scale (WHOQOL–BREF) (WHOQOL group, 1998), the Perceived Stress Scale (Cohen et al., 1983), and the Physical Self–description Questionnaire (Marsh, 1996) were taken. Data analysis was done using ANOVA and the Pearson partial correlation coefficient in SPSS version 26, and the effect size of the training intervention was determined using STATA version 12 statistical software. The significance level of the tests was 0.05.

The results of comparing the strength as well as explosive performance of the upper limbs of the wheelchair basketball players in the experimental group (10 people) and the control group (10 people) demonstrated that the training intervention significantly increased the strength performance of the biceps muscle (p<0.001), strength performance of trunk flexion (p<0.001), strength performance of shoulder flexion (p<0.001), explosive performance of chest pass (p=0.002) as well as explosive performance of backward throw (p<0.001) in the experimental group. Moreover, training intervention caused a significant reduction in time of short–distance speed performance without a ball (p=0.032), agility performance with a ball (p<0.001), and agility performance without a ball (p=0.003) in the experimental group. Finally, the results of the correlation analysis showed a direct and significant relationship between the explosive performance variable of the chest pass and the quality of life (p=0.044). Furthermore, there was a negative and significant relationship between the variables of pain perception and perceived stress and physical performance components (p<0.05).

According to the findings of the present research, combined plyometric and resistance exercises can improve the physical performance of national team wheelchair female basketball players and can be proposed as a practical solution to be used in the training programs of the coaches of these athletes.

Osteoporosis is a widespread skeletal condition due to decreased muscle strength and bone density. The most common complications are fractures followed by pain and reduced quality of life (QoL). Therefore, this research aimed to examine the effect of exercise therapy on muscle strength, QoL, and bone mass in osteoporotic women.

Available literature was reviewed using ScienceDirect, PubMed, Google Scholar, and Cochrane. Studies were considered eligible if they were randomized controlled trials (RCT) conducted on postmenopausal osteoporotic women, used exercise therapy as an intervention, and investigated muscle strength, QoL, and bone mass as outcomes. Two authors independently assessed the quality of the articles using the physiotherapy evidence database (PEDro) scale. The Cohen’s d effect size was computed by dividing the mean standardized difference by the standard deviation to measure the treatment effect, which includes exercise therapy.

Seven papers were chosen to be included in this research. Their PEDro scores varied between 6 and 9 out of a possible 10. The effect size mean differences, resulting from exercise therapy, ranged from 0.32 to 0.63, indicating “small” to “moderate” effects in enhancing the condition of osteoporotic postmenopausal women. It was reported that there was a small effect size in 5 studies and a medium effect size in 2 studies. The research findings suggested the effect of balance, strengthening, stretching, stability, and motor control exercises on bone mass and muscle strength in osteoporotic postmenopausal women.

Findings indicate that exercise therapy interventions positively affect muscular strength, QoL, and bone mass in osteoporotic postmenopausal women. Additional well-conducted research is required to support this assumption further.

Lower limb deformity in children with cerebral palsy (CP) is a common musculoskeletal problem and planovalgus is the most prevalent, characterized by talus median subluxation, calcaneal valgus, and supinated forefoot. According to studies, one issue in orthopedics and pathology is the accurate diagnosis and proper treatment of planovalgus deformity in children with bilateral spastic cerebral palsy, which has attracted researchers’ attention. Accordingly, the present study investigates the effect of planovalgus deformity on the motor performance and balance of these children.

This cross-sectional study employed a descriptive-analytical design. The convenient sampling method was used among children with bilateral spastic cerebral palsy, diagnosed with unilateral planovalgus, who were referred to the clinics of the University of Social Welfare and Rehabilitation Sciences (Nezam Mafi) and occupational therapy clinics from September 2022 to February 2023 in Tehran City, Iran. Meanwhile, all participants were willing to cooperate in this research. A total of 27 participants were evaluated by an occupational therapist based on the specified criteria and gross motor function classification system (GMFCS), which included the assessments of balance, muscle strength, range of motion, and pain. Data analysis was done using the SPSS software, version 16.

The results revealed a statistically significant difference between the mean range of motion of ankle dorsiflexion and knee extension between the two limbs (P<0.001). The mean muscle strength of the quadriceps and ankle plantar flexors indicated a statistically significant difference in the affected limb (P<0.001). Additionally, the mean displacement of the center of pressure of the foot also demonstrated a statistically significant difference regarding topographical involvement (P<0.001).

Planovalgus deformity is one of the most common ankle deformities, which is of great concern for children with cerebral palsy. The results obtained from the assessments of the child’s balance and motor function demonstrated the importance of assessment strategies and early interventions to achieve better rehabilitation outcomes for children with CP and planovalgus deformity.

The aging process leads to changes in motor performance, including decreased balance and weakened muscular strength, increasing the risk of falls. This study aimed to investigate the immediate impact of proprioceptive exercises on balance, proprioception, and muscle strength in elderly individuals and adults.

In a semi-experimental, 20 adults and 20 elderly individuals (with average ages of 27.20 and 65.73 years) were randomly selected. Balance was assessed using the Timed Up and Go (TUG) test, while proprioception was measured with a digital camera and AutoCAD software. Isometric muscle strength of the quadriceps and hamstring muscles was evaluated with a hand-held dynamometer. Assessments were conducted before, immediately after, and one hour post exercises. Data analysis was performed using a mixed model for repeated measures design.

Significant improvements were showed in proprioception, with both adult and elderly groups experiencing enhancements of 32.21% and 30.54%, respectively (p<0.05). The TUG test revealed a significant difference between the two groups, with the adults and elderly showing improvements of 7.77% and 2.02%, respectively, compared to their pre-exercise performance (p<0.05). Additionally, there was a significant variation in isometric strength of the hamstring and quadriceps muscles between the groups (p<0.05). Following the exercises, quadriceps muscle strength improved by 9.88% and 4.30% in the adults and elderly groups, respectively (p<0.05).

The immediate benefits of proprioceptive exercises can be harnessed by healthcare professionals and community members to enhance the motor functions of both elderly individuals and adults.

Accurate assessment of cardiorespiratory function, muscular strength and endurance seems necessary for awareness and for providing exercise interventions and prevention of subsequent diseases. Therefore, the aim of the current research was to develop a comprehensive tool for assessing cardiorespiratory, muscular strength and endurance function in people with intellectual disabilities.

The current research is fundamental and has practical implications in terms of its purpose. In this study, the psychometrics of 51 specific tests of intellectual disability people were used to develop a tool for measuring cardiorespiratory function, muscular strength and endurance. The face validity of the instrument was examined through a 51-test questionnaire by 15 experts and 15 intellectually disabled educators, the content validity by a 51-test questionnaire by 15 experts, and the construct validity through a 19-test questionnaire by 243 intellectually disabled educators. The reliability of the tool was checked through internal, intra-rater and inter-rater consistency. Internal consistency was estimated with Cronbach's alpha. The intra-rater and inter-rater reliability were also checked through the implementation of the tests by 18 people with intellectual disability in three times and with three raters through the internal correlation index (ICC), confidence interval (CI) and standard error of measurement (SEM). Data analysis was done through exploratory and confirmatory factor analysis with AMOS26 and SPSS22 software.

Based on the results of estimating the content validity ratio (CVR), 19 out of 51 tests had a content validity ratio higher than 0.49 and the rest of the tests were excluded. In terms of construct validity, 10 out of 19 tests were removed and the final 9 tests were approved for evaluating cardiorespiratory function, muscular strength and endurance. Exploratory factor analysis extracted three latent factors that explained 46.21% of the total variance. Confirmatory factor analysis confirmed the final construct model. From the results of factor analysis, KMO=0.829, BT=4706.93 and p<0.0001.

The current study provided a special set of tests for people with intellectual disability in the fields of cardiorespiratory assessment (one test), strength (four tests) and muscular endurance (four tests). after psychometry, 51 specific tests were presented in this field. By using this set of tests, it is possible to make an accurate assessment of the physical fitness related to the health of people with intellectual disability.

High-intensity functional training (HIFT) is an exercise modality that emphasizes functional, multi-joint movements that can be modified to any fitness level and elicit greater muscle recruitment than more traditional exercise. Therefore, this research aims to compare eight weeks of HIFT with high-intensity interval training (HIIT) on some factors of physical fitness, time to exhaustion, and lactate levels in officer students. In this semi-experimental research, 30 officer students with an average age of 20.04 ± 0.84 were randomly divided into 15 HIIT and HIFT groups. All the tests were done before and after the implementation of exercise protocols. Both HIIT (running-based) and HIFT (bodyweight-based functional movements) protocols were performed for 8 weeks, 3 days per week, at the intensity of 85-90% of the maximum heart rate. Basic evaluations included body composition evaluation, fatigue test, muscle strength and power test, and Army physical fitness test. The findings of this research showed that HIFT and HIIT increased respectively aerobic fitness (15.69%, 9.61%), back and leg muscle strength (16.02%, 5.02%), vertical jump (25.31%, 5.14%), push-up (19.61%, 9.39%), sit up (18.24%, 9.83%), time to exhaustion (16.21%, 14.41%) and reduced body fat percentage (18.38%, 12.18%), and lactate levels (22.89%, 14.77%). Also, HIFT was more effective than HIIT in increasing aerobic fitness (P=0.0001), back and leg muscle strength (P=0.0001), leg muscle power (P=0.0001), abdominal and shoulder girdle muscle (P=0.0001) endurance, time to exhaustion (P=0.0001), and reducing body fat percentage (P=0.002). It seems that high-intensity training, especially HIFT can improve several factors of physical fitness at the same time, and it is more suitable for tactical athletes (soldiers, firefighters, etc.) who need high physical fitness to perform their duties.

High-fat diet (HFD) leads to adverse changes in skeletal muscles. Regular exercise reduces skeletal muscle disorders by maintaining physical function. This study aimed to assess the effect of high-intensity interval training (HIIT) on muscle strength, endurance capacity, food consumed, energy intake, and Lee index in male rats consuming a HFD and normal diet (ND). 44 rats were divided into four equal groups, including ND control, HFD control, HIIT+ ND, and HIIT+ HFD. The HIIT was performed for 12 weeks at 85-90% of the maximum speed. Data were analyzed by repeated measures analysis of variance and one-way analysis of variance at a significance level of P<0.05. Food consumed and energy intake were lower and higher, respectively in the HFD control group compared with the ND control. Also, the body weight, Lee index, food consumed, and energy intake in the HIIT+HFD group were significantly lower than in the HFD control group and Lee index and food consumed in the HIIT+HFD group were significantly lower than in the HIIT+ND group. Furthermore, the endurance capacity in the HIIT+HFD group was significantly higher than in the HFD control group and in the HIIT+ND group was significantly higher than the ND and HFD controls. Absolute and relative muscle strength also increased and decreased in all groups, respectively. It seems that performing HIIT despite consuming a HFD leads to improved physical function and reduced body weight gain.

Mental fatigue usually occurs after long-term cognitive activities, reducing cognitive performance and leading to motor coordination changes. Therefore, this study aimed to investigate the effect of Swedish relaxation massage on reducing mental fatigue and enhancing knee strength and Proprioception in university female athletes. In this study, 16 female physical education athletes were randomly selected as a sample based on the inclusion criteria and subjected to the mental fatigue protocol (45 minutes of cognitive activity). Active and passive knee proprioception was evaluated with an inclinometer before and after mental fatigue, and knee extension strength was evaluated with a manual dynamometer. After 48 hours, the subjects underwent a Swedish relaxation massage. Immediately following the massage session, assessments were conducted to measure mental fatigue and the second post-test. A repeated measures analysis of variance test was employed to examine the intra-group changes over time. The findings showed a significant difference between the subjects' mean scores of active Proprioception, passive Proprioception, and knee extension strength in comparing the post-test of mental fatigue with the post-test of Swedish relaxation massage (P<0.05). The present study's findings showed that Swedish relaxation massage can be used as an effective intervention in controlling mental fatigue. Therefore, this intervention can be used to prevent sports injuries of athletes, especially amateur athletes, where mental fatigue is common.

Population aging is a global phenomenon and increase in the number of people over 60 yeas of age proves that the world is aging.  An important component of successful aging is maintaining muscle mass and its function throughout life. This study investigated the relationship between vitamin D serum level and muscle strength in the elderly as one of the important components of successful aging.

In this cross-sectional study, out of 1,616 people who participated in the Amirkla Elderly Cohort, 720 people were randomly selected by considering eligibility criteria. The participants were divided according to their Vitamin D serum concentrations: Vitamin D deficiency (20ng/ml>), inadequate (30ng/ml>Vitamin D>20ng/ml), and sufficient (30ng/ml<). Hand muscle strength was measured using DIGI Hand Dynamometer, and quadriceps muscle strength was measured by the MMT clinical grading system that was divided into weak and sufficient according to the standard cut-off point. SPSS V17 was used and data were analyzed using One-way ANOVA, Chi-square, and Spearman's correlation.

This study was conducted in 720 elderly people (360 men and 360 women) in Amirkola, north of Iran. Mean arm muscle strength was 25.84±9.8 and mean quadriceps muscle strength was 22.55±10.4. The average level of vitamin D was 35.15±33.73. There was no significant difference between the three groups in terms of arm and quadriceps muscle strength (P=0.272, P=0.370, respectively). In men, there was a positive correlation between BMI and arm muscle strength and quadriceps muscle strength (r=0.161, P=0.002 and r=0.168, P=0.0001). In women, there was a positive correlation between physical activity and arm muscle strength and quadriceps muscle strength (r=0.19, P=0.0001 and r=0.22, P=0.0001, respectively).

This study showed no significant relationship between serum vitamin D levels and muscle strength.

The effect of ketogenic diets (KD) on body composition in different populations has been investigated. More recently, some studies have recommended that athletes adhere to ketogenic diets to optimize changes in body composition during training. However, there is less evidence related to trained women. The present study was conducted with the aim of investigating the effect of eight weeks of ketogenic diet along with resistance training on muscle strength and body composition of obese women.

 In this semi-experimental study, which was conducted with a pre-test and post-test design, 30 obese women of Khorram Abad city, with an age range of 20 to 35 years, were selected through convenience sampling.  They were divided into 2 groups of 15 people consuming ketogenic diet and non-ketogenic diet  under the conditions of 4 training sessions per week (divided into 2 periods 4 weeks) for eight weeks of resistance training, they were divided into 2 groups of 15 people consuming ketogenic diet and non-ketogenic diet.

 The results showed that the ketogenic diet compared to the non-ketogenic diet had a significant effect in reducing body fat percentage (p<0.01).Other results showed that the non-ketogenic diet improved muscle strength compared to the ketogenic diet. However, the ketogenic diet and non-ketogenic diet had no significant effect on lean mass (p>0.05).

 These findings show that increasing strength can be achieved in a ketogenic diet, but these gains may be less compared to the ketogenic diet in women.

Multiple sclerosis disease (MS) is progressing, especially in women. The present study aimed to determine the effect of eight weeks of resistance training with two types of linear and nonlinear periodized on muscle strength, fatigue, and quality of life in women with MS.

A total of 19 patients with MS were selected and randomly assigned to three groups: nonlinear periodized (NLP) (n=6), linear periodized (LP) (n=5), and control (n=8). Both exercise groups performed resistance exercises three sessions a week for 30-45 minutes per session, with an intensity of 30%-70% of a maximum repetition for eight weeks. The linear group (LP) used a linear loading pattern per week. In contrast, the nonlinear group (NLP) experienced different intensities of training from the fourth week onwards. Two days before and after the training protocol, muscle strength was measured indirectly. Moreover, fatigue was evaluated with a 5-item Modified Fatigue Impact Scale (MFIS-5) and quality of life with a 36-Item Short Form Health Survey (SF-36). The results were analyzed in SPSS software (version 21) using the analysis of the covariance model and Fisher's least significant difference (LSD) post hoc test.

Based on the results, LP and NLP training led to a marked increase in muscular strength )P<0.001) and a significant decrease in fatigue )P=0.020) in MS patients. Nonetheless, no significant difference was observed in the quality of life between research groups )P=0/092). There were no significant differences between LP and NLP in factors, except leg press  (P<0/001).

As evidenced by the obtained results, both LP and NLP training models increased muscle strength and reduced fatigue. Nevertheless, linear resistance training led to greater improvement in the aforementioned factors.

Muscle weakness is one of the side effects of inactivity that causes movement disorders and skeletal muscle abnormalities, especially in teenage girls. Therefore, resistance sports stimulate and grow muscles, maintain stability and balance in the body. This study was conducted with the aim of determining the effect of resistance exercise on the muscle strength of female students aged 13-15 years in Gorgan city.

This experimental study was conducted on 50 female students aged 13-15 years old in Gorgan city as a simple random allocation in two groups of test and control. In the test group, 8 training sessions were performed every week, 2 sessions of 50-60 minutes in the gym. No intervention was performed in the control group. The tools for measuring upper and lower body muscle strength were chest press weight and leg weights respectively. The data was entered into SPSS21 statistical software and analyzed by descriptive statistics and inferential statistics.

Covariance test showed a significant difference in comparing upper body muscle strength with eliminating the effect of pretest (P <0.01, Eta = 0.28). Covariance test showed a significant difference in comparing lower torso muscle strength by eliminating the effect of pretest (P <0.01, Eta = 0.42).

Resistance exercise plays an important role in strengthening the muscular strength of the upper and lower limbs of students. It is necessary for managers and health professionals to use these training methods to prevent girls' spine problems.

Multiple sclerosis (MS) causes an asymmetric pattern in the strength of the muscles on both sides of the body. So far, the amount of asymmetry in the isometric strength of knee muscles in Iranian women with MS has not been studied. Therefore, this study aimed to investigate the extent of bilateral asymmetry in the isometric strength of knee flexor and extensor muscles in Iranian women with MS.

This is a causal-comparative study. From 93 MS patients, 27 females (20-50 years with an expanded disability status scale of less than 4) were selected as the statistical sample. Maximal voluntary isometric contraction (MVIC) of the knee flexor and extensor muscles was measured at the angles of 20 and 70 degrees using a Biodex isokinetic dynamometer. The asymmetric score in muscle strength was also calculated as a percentage of the ratio between the peak torque isometric strength in the muscles of the weak leg to the strong one. The data were analyzed using the correlated t-test at the 95% confidence level.

The results showed a significant difference in MVIC of the knee extensor and flexor muscles between the strong and the weak leg at the angles of 20 and 70 degrees in the statistical sample of the present study (P=0.001). Additionally, in terms of asymmetry in strength, the results showed that the highest percentage of bilateral asymmetry between strong and weak legs was in the strength of knee extensor muscle at the angle of 20 degrees (31.2%), and the lowest percentage was in knee flexor muscles at 70 degrees (16.1%).

The results of this study showed that the asymmetric rate in the strength of flexor and extensor muscles of the strong and weak leg is about 16% to 31% in Iranian women with MS with an expanded disability status scale of less than 4.

This study aimed to investigate the comparison of isokinetic parameters of hip and knee joint muscles in professional soccer players with athletic groin pain (AGP) and healthy ones.

32 soccer players (control group (n=16) and AGP group (n=16)) who take part in the first and second division league participated in this study. The isokinetic dynamometer with a speed of 90 degrees per second was used to evaluate the selected isokinetic parameters.

The independent sample T-test showed that the mean power and rate of torque development in concentric contraction except in knee flexors muscles was significantly higher in the control group. The relative peak of torque in the adductor muscles group in concentric contraction and the hip and knee flexor-extensor groups in concentric and eccentric contraction was also significantly higher in the control group than the AGP ones. In the control group, the hip extensor muscle torque in concentric contraction occurred significantly at a higher flexion range of motion. The acceleration time of the knee extensor muscle group in concentric and eccentric contraction and the adductor group in concentric contraction was significantly shorter than the APG group.

The present study's findings showed that athletic groin pain could affect the isokinetic profile of the hip and knee joint muscles, which were more pronounced in concentric contraction. It is suggested that coaches pay special attention to concentric contractions in the final stages of an athlete's back to the sport.

Anthropometric measures are of great importance in evaluating older adult health. This study was carried out to examine five-year changes in anthropometric indices of older adults and its association with demographic characteristics, muscle strength, and comorbid disorders.

This cohort study was conducted during 2011-2016 in people aged 60 years and over participating in the Amirkola Health and Ageing Project (AHAP). The elderly whose anthropometric characteristics were complete in the data bank of AHAP were included in the research by census. Demographic characteristics, comorbidities, and anthropometric measures, including height, weight, body mass index, neck, waist and hip circumferences, waist-to-hip ratio (WHR) and waist-to-height ratio (WHtR) were assessed, and five-year changes were calculated.

Among 897 people, significant reductions were seen in height, neck, waist, and hip circumferences, WHtR (P<0.001), and WHR (P=0.031). Change in weight loss was not statistically significant (P=0.152) and body mass index increased (P<0.001). Reductions in height, neck, waist and hip circumferences, and decrease in WHtR were found to be significantly different between women and men (P<0.001). There was a significant positive correlation between the number of comorbidities and five-year changes of height (r=0.104, P=0.002) and hip circumference (r=0.095, P=0.005), and a negative correlation between strength of the arm (r=-0.341, P<0.001) and quadriceps (r=-0.324, P<0.001) muscles and comorbidities.

This study represented a pattern of significant reduction in height, neck, waist, and hip circumference, waist-to-hip ratio and waist-to-height ratio, and increase in body mass index in older adults, over five years. Furthermore, significant correlations between comorbid disorders and changes in height and hip circumference, and muscle strength were shown.

Elevated blood pressure may develop in hypertensive patients after performing resistance training. The present study aimed to investigate the effect of beetroot juice on cardiovascular and functional changes during and after a session of acute resistance training in men with hypertension.

In the present single-blind quasi-experimental study, 20 men with hypertension were randomly divided into two groups of Beetroot Juice (BJ) and Placebo (PLA). Upper and lower body muscular strength, Perceived Exertion (RPE), Systolic and Diastolic blood pressure (SBP, DBP), and resting and continuous Heart Rate (HR) were measured after resistance training in the pre-test. In the post-test, BJ and PLA groups consumed beetroot juice and non-caloric cherry flavor Beverage (4.5 mg/Kg Bodyweight), respectively, 150 minutes before repeating the measurements. Data were analyzed using three-way ANOVA, student’s t-test, and Mann–Whitney U test at a significance level of 0.05.

Beetroot juice significantly reduced SBP, DBP, and HR at rest and after resistance training compared to PLA. Furthermore, BJ significantly increased lower body muscular strength and decreased RPE during resistance training.

Beetroot juice is a useful beverage that easily and harmlessly controls blood pressure in hypertensive patients. This drink prevents the risk of high blood pressure in addition to improving performance during resistance training.

Over the last couple of decades, research has focused on attempting to understand the genetic influence on sports performance. Whole exome sequencing (WES) has great potential to explore all possible genetic variants associated with physical performance. However, this new technique has not been used in sports genetics research. Therefore the aim of this case study was to report new variants in genes involved in skeletal muscles strength (ACE, NOS3, IGF1R, IL-6) in an elite weightlifter using WES.

After obtaining a written testimony from a 32-year-old man, who is a member of the Iranian national weightlifting team, 5 cc of blood was taken and then DNA was extracted. DNA samples were analyzed using the whole exome sequencing method.

Whole exome sequencing analysis revealed a missense variant (99454613G>A) in IGF1R, 22771156C>T polymorphism in IL-6, 150695726T>C and 150704250C>G polymorphisms in NOS3 and 61573761T>C and 61564052A>G in ACE genes.

Results of whole exome sequencing analysis revealed a missense variant and polymorphism in muscle strength and hypertrophy related genes in this elite weightlifter. However, other studies with larger sample sizes are needed to investigate the relationship between these variants and power athlete status.

The prevalence of overweight and obesity and its complications are rapidly increasing in the world. Therefore, new ways are needed to prevent and cure this health dilemma. This study was performed with aim to compare the effect of six weeks of resistance training along with blood flow restriction (Kaatsu) with two different intensities on body fat percentage, muscle strength, and serum level of Irisin in overweight women.

This semi-experimental study was performed in 2019 on 42 overweight women in Mashhad. The subjects were randomly assigned into three groups: resistance exercises with blood flow restriction (BFR) and intensity of 20-30% of 1repetition maximum (1RM), resistance training with BFR and intensity of 40-50% and control group. The training groups received training three sessions per week and 60-50 minutes each session for six weeks. Before and after the intervention, serum levels of Irisin, muscle strength and fat percentage were taken. Data were analyzed by SPSS software (version 23) and ANCOVA test. p < 0.05 was considered statistically significant.

Six weeks of resistance training along with Kaatsu with two variable intensities resulted in a significant increase in strength in the post-test (P=0.001). Changes in irisin levels and fat percentage were not significantly different between the two groups (P≤0.05).

Resistance training along with Kaatsu significantly decreased fat percentage at 20-30% of intensity without changes in serum level of irisin.