Comparison of the effect of six weeks of tri-set resistance training without rest and with limited rest on metabolic stress indicators and sarcoplasmic hypertrophy

this study aimed to compare the effect of six weeks of tri-set resistance training without rest and with limited rest on metabolic stress indicators and sarcoplasmic hypertrophy in recreational athletes with a training history of ۶ months to ۱ year. ۳۰ healthy men with resistance training background of ۶ months and less than ۱ year were selected for this stud and randomly divided into one of three experimental groups, the first group-resistance training with tri-set method without rest between movements (tri-set ۰) (n=۱۰), the second group of resistance training with tri-set method without rest between movements (tri-set ۱) (n=۱۰) and the control group (n=۱۰). After the initial measurements, the training groups performed the defined training protocol three sessions a week, on non-consecutive days for six weeks. Dynamic muscle strength was measured by ۳ maximum repetitions test of back squat, bech press, barbell curl. Anthropometric measurements and body composition measurements, estimated by three methods: BIA Inbody ۵۷۰, Jackson Pollock ۷-sight skinfold caliper formula, measuring tape,body fat estimating formula of US Navy method. The cross-sectional area in order to measure hypertrophy of the thigh and arm, Are estimat,ed by using a measuring tape, bone caliper and skin fold caliper.The amount of lactate was measured by Scott's lactate device from fingertip blood and senslab lactate strip.The results showed that the maximum dynamic strength, cross-sectional area of thigh and arm muscles, the amount of body fluids increased significantly in the training groups and compared to the control group, but no significant difference was seen between the training groups. Also, the amount of lactate in both stages were significantly increased compared to the baseline in both groups, but in the tri-set ۰, it was significantly higher than the tri-set ۱.Conclusion: According to the results, there is probably no difference between short rest intervals and no rest between movements in consecutive training systems such as tri-sets during six weeks and hypertrophy adaptations. Apparently, the reason for skeletal muscle hypertrophy in response to resistance training is probably partially rooted in sarcoplasmic hypertrophy and myofibrillar hypertrophy, and by increasing muscle cross-sectional area, increasing total body water and intracellular water, maximum dynamic muscle strength will increase. Despite this, the amount of relative differences will probably be influenced by exercise protocols with different volumes and intensities, and high volume exercise protocols are associated with increased sarcoplasmic hypertrophy. Sarcoplasmic hypertrophy can be seen as a necessary process to increase myofibrillar hypertrophy. In addition, despite the high impact of metabolic stress on hypertrophy, moderate to high metabolic stress is probably not the main mechanism for obtaining hypertrophy in a period of ۶ weeks, and more studies are needed to compare the differences.

کلیدواژه ها:

skeletal muscle ، body composition ، lactate ، muscle growth ، intracellular