جستجوی مقالات مرتبط با کلیدواژه "eccentric resistance exercise" در نشریات گروه "تربیت بدنی"

After an eccentric resistance exercise, athletes experience some degree of muscle soreness such as delayed muscle soreness. Following this damage, inflammatory factors are released into the bloodstream. The aim of current study was to find out the effect of ZMA supplementation on inflammatory factors of muscle injury (CK and LDH) following a bout of eccentric resistance exercise in non-athlete women. For this purpose, young and healthy women aged 18 to 28 years with a body mass index of 20 to 25 were used. Individuals were randomly divided into three groups of ten, including: 1- eccentric resistance exercise and ZMA supplementation, 2- eccentric resistance exercise and placebo, and 3- eccentric resistance exercise without supplementation and placebo. All three groups participated in an eccentric resistance exercise (lying leg curl muscles training hamstring yo-life supreme) the day before the test. Individuals underwent group-specific supplementation for two weeks. Then, the groups participated in the same eccentric resistance exercise as before. Blood samples were collected before and after physical activity and CK and LDH levels were assessed. The results showed that CK and LDH levels increased after eccentric resistance exercise in each group, although it was not significant for all studied groups and no significant difference was observed between the three groups after supplementation (P> 0.05). Eccentric resistance exercise seems to increase muscle injury as an indicator of muscle contusion in non-athlete women, and 14 days of supplementation with ZMA does not significantly reduce muscle injury.

Start or continuation of physical activity can especially be a challenge for non-athletes due to exercise-induced muscle injuries. Therefore, the purpose of this study was to investigate the dose-dependent effects of beta-hydroxy beta-methyl butyrate (HMB -FA) on muscle and liver damage indices induced by high-intensity eccentric resistance exercise in non-athlete girls.

24 non-athlete girls (age= 25.87±1.65 years, BMI=20.97±1.36) selected from volunteers to participate in this study. Participants were randomly divided into three HMB-FA supplementation groups (n=8) with doses of (HMB-1.5) 1.5, (HMB-3) 3, and (HMB-4) 4 g/d. After six days of supplementation, an eccentric resistance session with a maximum intensity of 120% was carried out. Blood and urine samples were collected in 4 stages including before supplementation, before exercise, immediately, and 24 hours after exercise. For comparison of the results, 3×4 variance analysis was used.

The results showed that different doses of supplementation had no significant effect on blood levels of AST and ALT as well as urine levels of creatinine and urea. However, LDH and CK levels showed significant inter and intragroup differences(p<0.05). Results showed that values of CK and LDH between HMB-1.5 and other groups had significant differences at 24h post-exercise session.

Considering significant differences in enzymatic indices of CK and LDH between 1.5g/d supplementation with 3 and 4 g/d doses, we conclude that 1.5g/d dose should not be considered as an inhibitor of high-intensity exercise-induced muscle damage. Also since 3 and 4 g/d showed no differences in inhibiting muscle and liver damage indices in blood and urine, the lower dose (3g/d) can be our prescription as the optimal dose.

The aim of this study was to evaluate the effect of time-consuming chocolate milk on some muscle damage indexes and performance of resistance exercise in male athletes. 33 male student-athletes 3±21 years old , Weight 81/7±65/67 body fat percentage 40/4±78/10% are recruited and randomly assigned to 3 groups, including control group(n=11), Group chocolate milk supplementation half an hour before resistance exercise (n=11) and Group supplementation chocolate milk immediately after exercise (n=11). Resistance exercise protocol includes movements of leg press, bench press, and the instep with 70% of one repetition maximum in 3 sets of 10 repetitions were performed. Blood sample were collected to measure index Creatine kinase (CK), Lactate Dehydrogenase (LDH) and serum lactate (LA) in 3 stages: Before, 45 minutes of activity and 24 hours after exercise. For data analysis, analysis of variance with ANOVA 3×3, ANOVA with Bonferroni test to check if the difference was statistically significant and meaningful level for all tests Alpha was set up to 0/05. In Group DA, the amount of lactate lower compared to DB (P=0/043) and CL (P=0/008) was observed in the second stage of sampling. The amount of CK Group DA 24 hours of exercise a significant decline compared to the control group (P=0/024) But no significant changes in serum LDH levels (P=0/54) to consider Cacao milk consumption reaches of sport activities can be effective in reducing muscle damages.

Strength training has an important role in the exercise programs of normal individuals and athletes and it also has numerous benefits on the health of human body and spirit. One of the types of these exercise is eccentric resistance exercise which is associated with negative physiological changes. Thus: this study examined the effects of a single bout of eccentric resistance exercise on the urinary markers of protein catabolism and muscle damage such as urea, creatinine and3-methylhistidine (3Mh). For this purpose, 24 healthy non-athletes male student volunteers (age; 20±1. 54, body mass index 22. 6±3. 8 and body fat percent 13. 41±4. 21) selected and were divided randomly into two groups experimental (n=12) and control (n=12) group. After determining the maximum power of the non-dominant hand, Experimental group performed a single bout of eccentric resistance exercise including 50 eccentric contractions as five sets of 10 eccentric contractions with a one minute rest interval between sets, at ٪85 of 1-RM with non- dominant hand. Urinary of samples to assess urea, creatinine and 3-methylhistidine were taken before exercise until 14 hour after intervention. Data were analyzed using independent sample t-test at p Results showed significant increase in urinary urea, creatinine and 3-methylhistidine after an eccentric resistance exercise in experimental group compared to control group. It is concluded that a single bout of eccentric resistance exercise results in an activation of the muscular protein catabolism, and muscle damage due to increase in degradation of myofibrillar contractile protein.

Introduction and The aim of the study was to examine the effect of short-term consumption of HMB supplementation on CK and LDH after eccentric resistance exercise in young male athletes. Twenty-four young male futsalplayer were selected and randomly divided into two groups of 12 of supplementation and placebo. Subjects consumed HMB or placebo for 6 days before a session of eccentric resistance exercise. Blood samples were taken to measuring CK and LDH in 4 times. The results showed that the effect of HMB supplementation on two markers of muscle damage (CK and LDH) is not significant but HMB supplementationcaused a significant reduction in both markers of muscle damage (CK and LDH) after eccentric resistance training on supplementation groupDiscussion and HMB supplementation can decrease markers of muscle damage، but the results cannot be used as functional supplements to reduce muscle damage markers caused by intense physical activity