Shenow Doghi; Kazem Khodaei; Mohammadreza Zolfaghar Didani
Abstract
Background: Suspension training induce acute physiological and vascular stress. This study aimed to evaluate the effectiveness of eight weeks of low-intensity TRX training with BFR (LITRX+BFR) versus high-intensity TRX training (HITRX) in terms of sex hormones, power, muscle hypertrophy, and balance ...
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Background: Suspension training induce acute physiological and vascular stress. This study aimed to evaluate the effectiveness of eight weeks of low-intensity TRX training with BFR (LITRX+BFR) versus high-intensity TRX training (HITRX) in terms of sex hormones, power, muscle hypertrophy, and balance in young women.Methods: This study was carried out in 2018 using a semi-experimental pretest-posttest design. Thirty-six active female students were selected and then assigned to LITRX+BFR, HITRX, and control groups through random number generation. Training groups exercised three weekly sessions for eight weeks. Each session consisted of 7 low/high intensity suspension training. The control group only engaged in routine physical activity. After blood sampling, testosterone, cortisol, and estradiol hormones were measured by ELISA method. Muscular hypertrophy evaluated by anatomical method, power with jumping performance, and balance were measured via tecnobody-pk212. SPSS version 26 was used to analyze data using ANCOVA with Bonferroni post-hoc test.Results: The findings indicated that LITRX+BFR and HITRX had a significant increase in testosterone (P=0.000 and P=0.001), testosterone to cortisol ratio (P=0.001 and P=0.001), and estradiol (P=0.000 and P=0.003) while no significant change in cortisol levels (P=0.227). Moreover, muscular hypertrophy (P=0.001 and P=0.001), power (P=0.001 and P=0.000), static (P=0.011 and P=0.005) and dynamic balance (P=0.001 and P=0.001) significantly higher in both LITRX+BFR and HITRX compared with the control group. No significant differences found between suspension training with/without BFR in all variables.Conclusion: It seems LITRX+BFR had improvement in sex hormones levels, muscular hypertrophy, power, and balance as like HITRX. Therefore, LITRX+BFR can be a good alternative to HITRX in young females.
Zeinab Hooshmandi; Farhad Daryanoosh; Javad Nemati; Reza Jalli
Abstract
Background: Aging is an inevitable physiological process leading to a progressive decrease in muscle mass and function, which is called sarcopenia. Correspondingly, this study aimed to investigate the effect of High-Intensity Interval Resistance Training (HIIRT) on certain sarcopenia-related factors ...
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Background: Aging is an inevitable physiological process leading to a progressive decrease in muscle mass and function, which is called sarcopenia. Correspondingly, this study aimed to investigate the effect of High-Intensity Interval Resistance Training (HIIRT) on certain sarcopenia-related factors in elderly women.Methods: This was a quasi-experimental study in which thirty elderly women aged 60 to 70 years, from April to September 2020, volunteered to participate and were randomly assigned to the experimental (n=15) and control (n=15) groups. Body Mass Index (BMI), Appendicular Skeletal Muscle Mass (ASM), Appendicular Skeletal Muscle Mass Index (ASMI), and body fat percentage were measured using bioelectric impedance analysis; handgrip strength was measured via Jamar dynamometer; walking speed was measured employing six-meter walking test (6MWT); IGF-1 level (μg/L) was measured with Mediagnost kit (Germany) and serum myostatin level (ng/L) was measured using ELISA kit from R&D Company (USA) via Enzyme-Linked Immuno Sorbent Assay )ELISA( method in two stages: pre-test (week 0) and post-test (end of week 8). Independent t-test was subsequently utilized to assess the research variables through SPSS software version 23 at 0.05 level of significance.Results: The results indicated a significant decrease in body fat percentage (1.05±0.79, p <0.001) and Myostatin (MSTN) (87.25±82.38, p <0.01) and a significant increase in handgrip strength (-08.58±4.50, p <0.001), ASM (-4.91±0.28, p <0.001), ASMI (-0.19±0.11, p <0.001), and 6MWT (-0.42±0.26, p <0.001) in the experimental group compared to the control. There was also an increase in IGF-1 (-0.83±2.90, P=0.88), yet it was not significant.Conclusion: The major components indicative of sarcopenia were improved through High-Intensity Interval Resistance Training. Therefore, HIIRT appeared to be one of the most important coping strategies for reduction of muscle mass and strength in older women. We could thus conclude that it is necessary for the elderly to do this type of training.
Madineh Zarei; Parisa Foroozan; Maryam Koushkie Jahromi; Mohammad Hemmatinafar
Abstract
Background: Efficient exercises for enhancing lipolysis could be implemented in the measures taken regarding obesity reduction and the related risk factors. The present study was conducted to compare the response of lipolysis inhibitory and excitatory hormones, including insulin, epinephrine, and glycerol, ...
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Background: Efficient exercises for enhancing lipolysis could be implemented in the measures taken regarding obesity reduction and the related risk factors. The present study was conducted to compare the response of lipolysis inhibitory and excitatory hormones, including insulin, epinephrine, and glycerol, as index of lipolysis to high-intensity interval resistance exercise (HIIRE) and traditional resistance exercise (TRE) protocols in overweight girls.Methods: This was a kind of acute and semi experimental study, which was performed during the winter of 2019. Eleven overweight young girls with a mean weight of 68.54±4.3 kg participated in this study objectively and voluntarily. The participants took part in HIIRE and TRE programs separately with at least a one-week interval. Blood samples were taken before and immediately after an exercise session in order to measure the levels of epinephrine, insulin, and glycerol. For analysis of the data, we utilized statistical method of paired t-test.Results: Statistical analysis of the data revealed a reduction in the level of insulin (P=0.009) and an increase in that of glycerol (P=0.04) after HIIRE. There were no significant changes in epinephrine following HIIRE (P=0.75) and TRE (P=0.15). Moreover, there were no significant differences concerning the changes of epinephrine (P=0.93), insulin (P=0.15), and glycerol (P=0.13) between HIIRE and TRE protocols (P>0.05).Conclusions: Regarding the decrease in lipolysis inhibitor (insulin) and the increase in glycerol, as an index of adipose lipolysis following HIIRE, it could be recommended as an effective exercise for reducing adiposity.
