Document Type : original article
Department of Physical Education and Sport Sciences, Islamic Azad University, Assad-Abad, Hamedan, Iran.
Faculty of Physical Education and Sports Sciences, Razi University, Kermanshah, Iran
Department of Physical Education, Faculty of Literature and Humanities, Ayatollah Boroujerdi University, Lorestan, Iran
Purpose: The present study aimed to determine the effect of a strength training course with different rest intervals on some physiological and biochemical characteristics in inactive healthy men.
Methods: 30 non-athlete male (18.97±2.30 years old, 18.78±4.89 cm, weight 68.94±1.35 kg) were randomly divided into three groups: strength training with decreasing rest (from 3 minutes to 30 seconds), strength training with increasing rest (30 seconds to 3 minutes) and strength training with constant rest (3 minutes; control group). Training groups (with a special periodization in terms of load, severity and distance between sets) had 9 weeks and 3 sessions a week. Strength training program wad 5 to 8 sets with 3 to 15 repetitions and loads of 60 to 90% of a maximum repetition. The only difference between the groups was the gap spacing applied between the sets. Also, two sessions of plyometric supplement training (60% HR intensity) were performed during the week. Blood samples were taken at fasting time before and after 48 hours passed from training period and analyzed by radio-immunoassay method in the laboratory. Data were analyzed using covariance test.
Results: Maximal strength, muscle endurance and testosterone concentration increased significantly in all three groups; and the difference between the groups was significant, but the percentage change in all tests in the first and second groups was higher than in the third group, but not significant. Also, after the training session, the concentration of growth hormones, fat percentage, free fat mass and body fat mass index increased and decreased significantly, respectively; Of course, the difference between the groups was not significant.
Conclusion: Resistance training with rest intervals of increasing and decreasing in comparison with rest intervals constant, due more to increase maximal strength, muscular endurance and some biochemical and hormonal factors.
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