October 25, 2012Open Access

Effects of Different Rest Intervals between Circuit Resistance Exercises on Post-exercise Blood Pressure Responses in Normotensive Young Males

Q: What is the clinical evidence from this study?

Study design: RCT. Population: Normotensive (n=11). Intervention: Circuit resistance exercises with 30s or 40s rest intervals vs. Control session without exercise. Primary outcome: Systolic blood pressure at 40 minutes post-exercise (30s rest interval vs Control) (p=0.004).

Key Result

Circuit resistance exercises with both 30-second and 40-second rest intervals significantly reduced post-exercise systolic blood pressure compared to a control session, with no significant difference in magnitude or duration between the two rest intervals.

Study Design

Type

RCT (n=11)

Blinding

Open-label

Randomization

Randomized crossover order

Multicenter

PICO

Population

11 healthy, sedentary, normotensive young males underwent circuit resistance exercise protocols with different rest intervals to assess post-exercise blood pressure responses over an 80-minute recovery period.

Intervention / Comparator

Circuit resistance exercises with 30s or 40s rest intervals vs Control session without exercise (3 circuits of 6 exercises with 10RM)

Primary Outcome

Systolic blood pressure at 40 minutes post-exercise (30s rest interval vs Control), p=0.004

Main Result

Absolute Event Rate: 103.6% vs 112.5%

p-value: p=0.004

Limitations

Small sample size
Only included healthy normotensive young males, limiting generalizability to hypertensive or older populations
Did not directly measure physiological mechanisms such as metabolite accumulation or vascular resistance

Abstract

PURPOSE: To investigate the blood pressure responses during recovery after two protocols of circuit resistance exercises (CRE) with different rest intervals (RI). METHODS: Eleven normotensive males (aged 19.5 ± 1.0 yrs, height 172.8 ± 5.7 cm and weight 65.1 ± 8.1 kg) performed two CRE with RI of 30 (RI30s) and 40 (RI40s) seconds between the exercises randomly, as well as a control session without exercise. The protocols consisted of 3 circuits of 6 exercises with 10 repetitions maximum (10RM) and 2 minute rest between circuits, followed by an 80 minute recovery period. Measurements were taken before exercise and at each 10 min of post-exercise recovery. The Analysis of Variance (ANOVA) with Repeated Measures (group × time) was used to analyze data, followed by post-hoc Bonferroni test, for P≤0.05. RESULTS: Post-exercise hypotension of systolic blood pressure was observed after both CRE with RI30s and RI40s (at R40, R50, R60, R70 and R80), whereas diastolic blood pressure did not differ from that measured at rest. In all measured moments, there was no significant difference between exercise trials in post-exercise levels of systolic and diastolic blood pressure. CONCLUSION: CRE with RI30s and RI40s between the exercises can lead to occurrence of PEH similarly in magnitude and duration. Our findings suggest a potentially positive health benefit of strength training.

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Cite This Study

Arazi et al. (Thu,) conducted a rct in Normotensive (n=11). Circuit resistance exercises with 30s or 40s rest intervals vs. Control session without exercise was evaluated on Systolic blood pressure at 40 minutes post-exercise (30s rest interval vs Control) (p=0.004). Circuit resistance exercises with both 30-second and 40-second rest intervals significantly reduced post-exercise systolic blood pressure compared to a control session, with no significant difference in magnitude or duration between the two rest intervals.

synapsesocial.com/papers/6a207785d48e67d1607804b8 https://doi.org/https://doi.org/10.5812/asjsm.34534