Effects Of Different Rest Intervals Research Articles

Effect of Rest Interval on Neuromuscular and Metabolic Responses Between Children and Adolescents

The purpose of this study was to compare the effect of different rest intervals and contraction velocities on muscle recovery following resistance exercise. 18 children (11.1 ± 0.52 yrs) and 19 adolescents (15.8 ± 0.49 yrs) performed three sets of 10 isokinetic repetitions at 60°/s and 180°/s. The work-to-rest ratio (W/R) was 1:2 and 1:4 for 60°/s, and 1:6 and 1:12 for 180°/s. ANOVA revealed that children demonstrated no significant decline in PT from the first to third set with any rest interval, but there was a significant (p < .05) decline for adolescents when a W/R of 1:2, 1:4 and 1:6 were used. Adolescents demonstrated significantly greater blood lactate (BLa) concentrations than children after three sets of resistance exercise. The present study indicates that adolescents may require longer rest intervals to recover full PT when compared with children.

Effect of Varying Rest Intervals Between Sets of Assistance Exercises on Creatine Kinase and Lactate Dehydrogenase Responses

To examine the effects of different rest intervals between sets on serum creatine kinase (CK) and lactate dehydrogenase (LDH) activity, 10 men (age = 25.6 ± 2.2 years, height = 173.1 ± 7.1 cm, and body mass = 75.9 ± 10.0 kg) participated in a randomized within-subject design that involved 4 resistance exercise sessions. Each session consisted of 4 sets of 10 repetitions with 10 repetition maximum loads for the chest press, pullover, biceps curl, triceps extension, leg extension, and prone leg curl. The sessions differed only in the length of the rest interval between sets and exercises, specifically: 60, 90, 120, 180 seconds. Serum CK and LDH were significantly (p < 0.05) elevated 24-72 hours after each session, with no significant differences between rest intervals (p = 0.94 and p = 0.99, respectively). The mechanical stress imposed by the 4 resistance exercise sessions invoked similar damage to the muscle fibers independent of the rest interval between sets. These data indicate that the accumulated volume of work is the primary determinant of muscle damage in trained subjects who are accustomed to resistance exercise with short rest intervals.

The effect of different rest intervals between multiple bench press bouts

In order to examine the effects of different rest intervals between sets on the training volume completed during a workout, 15 male bodybuilders served as subjects (Mean SD, age=25.28±2.01; mass=73.06±8.33 kg; height=176.33±6.30 cm). All the subjects performed a minimum of three strength workouts per week for a period of two years. Data collection took place over a period of four weeks with four testing sessions. During the first session, one repetition of the maximum (1RM) for the Bench Press (BP) was tested. Each of the next three sessions included four sets of exercises performed with a 75% of 1RM load. Rest between sets was randomly assigned from: a timed three-minute rest period; a 1:3 work: rest (W/R) ratio (1:3 W/R) and achieving a post exercise heart rate (HR) of 60% age-predicted maximum (60% Post-HR). The repetitions to exhaustion from set two to set four were significantly higher in three-minute rest conditions than 1:3 W/R and a 60% Post- HR rest conditions (P

Effect of Different Rest Intervals After Whole-Body Vibration on Vertical Jump Performance

Whole-body vibration (WBV) may potentiate vertical jump (VJ) performance via augmented muscular strength and motor function. The purpose of this study was to evaluate the effect of different rest intervals after WBV on VJ performance. Thirty recreationally trained subjects (15 men and 15 women) volunteered to participate in 4 testing visits separated by 24 hours. Visit 1 acted as a familiarization visit where subjects were introduced to the VJ and WBV protocols. Visits 2-4 contained 2 randomized conditions per visit with a 10-minute rest period between conditions. The WBV was administered on a pivotal platform with a frequency of 30 Hz and an amplitude of 6.5 mm in 4 bouts of 30 seconds for a total of 2 minutes with 30 seconds of rest between bouts. During WBV, subjects performed a quarter squat every 5 seconds, simulating a countermovement jump (CMJ). Whole-body vibration was followed by 3 CMJs with 5 different rest intervals: immediate, 30 seconds, 1 minute, 2 minutes, or 4 minutes. For a control condition, subjects performed squats with no WBV. There were no significant (p > 0.05) differences in peak velocity or relative ground reaction force after WBV rest intervals. However, results of VJ height revealed that maximum values, regardless of rest interval (56.93 ± 13.98 cm), were significantly (p < 0.05) greater than the control condition (54.44 ± 13.74 cm). Therefore, subjects' VJ height potentiated at different times after WBV suggesting strong individual differences in optimal rest interval. Coaches may use WBV to enhance acute VJ performance but should first identify each individual's optimal rest time to maximize the potentiating effects.

Efeitos de diferentes intervalos de recuperação no desempenho muscular isocinético em idosos

OBJECTIVE: To compare the effects of different rest intervals (RI) between sets of isokinetic contractions on muscle performance in older adults. METHODS: Twenty older participants (66.9±3.9 years; 76.1±13.4kg; 169±5.2cm) underwent three sessions of unilateral isokinetic training for the knee extensor muscles, with different RI (1 minute, 2 minutes and 3 minutes) at an angular velocity of 60°•s-1. Each session consisted of three sets of 10 repetitions, during which the peak torque (PT), total work (TW) and fatigue index (FI) were evaluated. Factorial ANOVA for repeated measurements, with Bonferroni post-hoc analysis, was used to identify possible differences between the RI. The statistical significance level was set at p 0.05). Although muscle performance was lower during the third sets with all RI, the greatest decreases in PT, TW and FI occurred with the 1 minute RI (p<0.05). CONCLUSIONS: The results showed that the RI variable has an important influence on isokinetic muscle performance in older adults, particularly from the third sets onwards, which suggests that RI should be increased as successive sets are performed within the same exercise session.

Acute GH and IGF-I responses to short vs. long rest period between sets during forced repetitions resistance training system

In order to examine the effects of different rest intervals between the sets on acute growth hormone (GH) and insulin-like growth factor-1 (IGF-I) responses, ten recreationally resistance trained men served as subjects (Mean ± SD, age=22 ± 2 years, body mass= 84 ± 8 kg). Subjects performed two heavy-resistance training protocols that were similar with regard to the total volume of work (sets x reps x loads), but differed with regard the length of rest between sets (1vs.3-minutes). Both protocols included 5 sets of 10 RM bench press and squat that performed on two randomized separate sessions. Blood samples were collected before, immediately after and 1-hour after the protocols for determination GH, IGF-I and blood lactate concentration. Postexercise values for lactate and GH were significantly (P£0.05) elevated above preexercise, but did not for IGF-1 concentrations. However, IGF-1 serum concentrations were significantly (P£0.05) increased during 1-hour postexercise. Postexercise serum GH and blood lactate concentrations were significantly (P£0.05) higher in SR than LR protocol, but IGF-1 did not change. These data suggest that the duration of the rest interval between sets of dynamic resistance exercise influence GH serum concentration, it must be noted that short rest period between sets induced greater acute GH responses than the long rest period. Given that GH concentration is an anabolic hormone, this finding may have implications regarding hypertrophy in resistance training. Keywords: Growth hormone; Insulin-like growth factor-1; Resistance training; Rest between sets. South African Journal for Research in Sport, Physical Education and Recreation Vol. 30 (2) 2008: pp. 31-38

The Effect of Different Rest Intervals Between Sets on Volume Components and Strength Gains

The purpose of this study was to compare squat strength gains and volume components when resting 2 minutes vs. 4 minutes between sets over multiple mesocycles. After the first squat 1 repetition maximum, 15 trained men were matched and randomly assigned to either a 2-minute (n = 7) or a 4-minute (n = 8) rest interval group. Each group performed the same training program, with the only difference being the length of the rest interval between sets. Subjects performed two squat workouts per week; one was labeled as Heavy and the other was labeled as Light. The squat workouts varied in the intensity, number of sets, and repetitions performed per set in a nonlinear periodized manner throughout each mesocycle. Differences in strength gains and volume components (the load utilized per set, the repetitions performed per set, the intensity per set, and the volume performed per workout) were compared between groups. Both groups demonstrated large strength gains; however, these differences were not significant between groups (P = 0.47). During all mesocycles, the 4-minute group demonstrated significantly higher total volumes for the Heavy workouts (P < 0.05). The findings of the present study indicate that large squat strength gains can be achieved with a minimum of 2 minutes' rest between sets, and little additional gains are derived from resting 4 minutes between sets. Therefore, athletes attempting to achieve specific volume goals may need longer rest intervals initially but may later adapt so that shorter rest intervals can be utilized without excessive fatigue, leaving additional time to focus on other conditioning priorities.

Acute Effect of Pre Activation on Bench Press Performance in Recreation ally TVained Men

Postactivation potentiation seems to occur due to the phosphorylation of myosin. Thus, there is a shift to the left in the force-pCa2+ relationship, leading to an increase in active force in levels of suboptimal Ca2+ concentrations. Likely, this mechanism can also lead to a delay on fatigue and cause an increase on muscular endurance (ME). PURPOSE: To investigate the acute effect of different rest intervals between pre-activation and bench press (BP) performance on ME. METHODS: After three familiarization visits, thirty male lifters experienced in performing the BP served as subject (Mean ± SD, age = 25.0 ± 5.8 years; height = 174.8 ± 8.8 cm; body mass = 78.5 ± 11.2 kg; body fat = 16.1 ± 5.0%; training experience = 4.7 ± 3.4 years), they performed a session for determination of the load regarding to one maximum repetition (1RM = 112.0 ± 13.0 kg) in the BP. Later, they randomly assessed in five sessions with minimum of 48 hours between than, that only differed for the experimental conditions. The control condition (CON) was composed by assesment of the number of maximum repetitions (RMs) in the 3 sets with 85% of 1RM in the BP. The other conditions were similar to CON, differing only by inclusion of 1RM preceding performance of RMs in 3 sets as pre-activation form. The pre-activation and performance of 3 sets were separate by rest intervals of 5 (P5), 10 (P10), 15 (P15) and 20 (P20) minutes. RESULTS: The results of ANOVA with repeated measures are presented in Table 1.Table 1: - Effect of the experimental conditions on the measured variablesCONCLUSION: The results demonstrated that P10 provided a significant increase of TF and the ME, generating larger RMs in the first and third sets.

Análise de diferentes intervalos entre as séries em um programa de treinamento de força

It is scarce in the literature studies that investigate chronic effects of different rest intervals in strength training (ST). The aim of the present study was to verify the influence of two different rest intervals between sets, over four weeks on ST. Twenty six men have participated in this study (22.5±2.1 years; 180.5±4.3 cm; 83.4±5.3 kg). The 10RM test was made in the following order: bench press (BP) and biceps curl (BC). The first group trained with a rest interval of 1 minute, and the other one with rest interval of 3 minutes between sets. The total training consisted in three sessions per week, performed in altered days (12 sessions). The subjects did four sets of each exercise in the respective intervals, and only after four sets in the same exercise, they went on in the next exercise. The exercise order was: BP, hack machine, BC, leg-press 45o, front lat pull down, abdominals and triceps pull down. A one-way ANOVA was used and a Tukey post hoc test was performed where indicated (p<0.05) to verify the interval rest effects on the measures. No significant differences between the 10RM loads were observed when compared the different rest intervals. We conclude that independently of rest intervals, no significant differences were observed in 10RM loads in ST during four weeks. To clarify the rest intervals influence on ST, we suggest new future studies with samples in different levels of physical fitness and training for longer periods

Effect of Rest Interval Length on Repeated 1 Repetition Maximum Back Squats

To examine the effects of different rest intervals on the repeatability of 1 repetition maximum (1RM) efforts in the free-weight back squat exercise, 17 weight-trained men served as subjects (mean age 22.0 years). One repetition maximum was tested on each of the first 2 days of testing to establish a stable baseline (1RM = 184.9 kg). Each of the next 3 sessions involved performing 2 1RM back squats, with the rest interval between attempted lifts being either 1, 3, or 5 minutes, assigned in a counterbalanced fashion. For the 1-minute rest interval, 13 of 17 subjects successfully completed the second lift; for the 3-minute rest interval, 16 of 17 were successful; and for the 5-minute rest interval, 15 of 17 were successful. Cochran Q analysis determined no significant difference (p > 0.05) in the ability to repeat a successful maximal-effort back squat when different rest intervals were used. These findings are consistent with the literature for the bench-press exercise and indicate that 1-minute rest intervals are sufficient for recovery between attempted lifts during 1RM testing or training for the free-weight back squat when involving lifters of this caliber.