A study by Kraemer and colleagues found that shorter rest intervals (1-minute) did increase acute levels of growth hormone in young men and women. However, despite some evidence showing acute increases in growth hormone levels with rest intervals less than 1-minute, the available evidence is highly conflicting. The authors suggest that shorter rest periods produce a greater hypertrophic effect because it results in higher increases in acute growth hormone. In the literature review by de Salle and colleagues (2009), their assessment found that shorter rest intervals of 30-60 seconds between sets of moderate-intensity proved most effective for goals of muscle hypertrophy. In both studies, employing a longer rest interval (4 or 5 minute) was either less, or no more, effective than using a shorter rest interval (1 or 2 minute) to elicit strength gains. However, findings from two studies investigating the effects of different rest periods on strength run contrary to the above findings. Since it is well established that shortening rest reduces the number of repetitions performed, longer rest periods may allow for a greater volume of work through higher repetitions in addition to greater training intensity (higher load), which may contribute to enhanced strength gains. In support, Shoenfeld and colleagues (2015) found that longer rest intervals (3 minutes) produced greater strength gains than shorter rest intervals (1 minute) following 8-weeks of resistance training with 3 total body workouts each week. Findings from this review showed that when using loads between 50-90% of 1-repetition maximum (RM), a rest interval between 3-5 minutes between sets allowed for more volume to be performed (more repetitions and sets) With respect to strength improvement, rest intervals between 3-5 minutes were found to produce greater long-term absolute strength gains. A Look Into the Research Rest Intervals to Maximise Strengthįew studies examine the effects of varying rest intervals on muscular strength and the available literature conflict in their findings.Ī literature review by de Salle and colleagues (2009) examined 35 studies to determine the effects of rest intervals on the acute and chronic muscular adaptations to resistance exercise. A number of studies indicate that increases in growth hormone act as an anabolic signal to increase muscle mass and enhance muscular adaptation. General recommendations for short rest intervals of 30-60 seconds are based on research that shows acute elevations in anabolic hormones, namely growth hormone. Some authors advocate even shorter rest intervals of 30-60 seconds to generate muscle hypertrophy gains, while using longer rest intervals of 3 minutes or more to maximise strength gains. Presently, guidelines from The American College of Sports Medicine recommend rest intervals between 1-2 minutes for novice and intermediate lifters wanting to build muscle and longer rest intervals of 2-3 minutes for advanced lifters using heavier loads. strength, hypertrophy, power or endurance). Rest intervals are typically prescribed according to the client’s goal (e.g. However, the correct manipulation of rest intervals can play an important role in maximising muscle growth, strength, endurance or power. Volume (repetitions and sets) and load (amount of resistance) receive the greatest attention in resistance training because they remain the greatest drivers of strength and muscle hypertrophy. repetitions, sets, load, rest intervals). In resistance training, whether the goal is to increase muscle mass (hypertrophy) or strength, the rate at which muscular adaptation occurs is dependent on specific training variables (i.e. Rest intervals can be defined as the total period of rest or relief between sets during exercise.
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