Abstract
OBJECTIVES:To compare the effects of combinations of resistance training (RT) and static stretching (SS) on heart rate (HR), systolic pressure (SBP), diastolic pressure (DBP), rate pressure product (RPP), oxygen saturation (SpO2), rating of perceived effort (RPE), and heart rate variability (HRV) in men.METHODS:Twelve normotensive healthy men participated in four protocols: a) SS+RT, b) RT+SS, c) RT, and d) SS. Variables were measured before, immediately after, and 15, 30, and 45 min after the sessions.RESULTS:The combination of SS and RT increased (p<0.001) HR when compared to the effects of the noncombined protocols (from 2.38 to 11.02%), and this result indicated metabolic compensation. Regarding DBP, there were differences (p<0.001) between the RT and SS groups (53.93±8.59 vs. 67.00±7.01 mmHg). SS has been shown to be able to reduce (p<0.001) SpO2 (4.67%) due to the occlusion caused by a reduction in the caliber of the blood vessels during SS compared to during rest. The increase in RPP (6.88% between RT and SS+RT) along with the HR results indicated higher metabolic stress than that reflected by the RPE (combined protocols increased RPE from 21.63 to 43.25%). The HRV analysis confirmed these results, showing increases (p<0.01) in the LF index between the combined and noncombined protocols. Compared to the effect of RT, the combination of SS and RT promoted a vagal suppression root mean square of the successive differences (RMSSD) index (from 9.51 to 21.52%) between the RT and SS+RT groups (p<0.01) and between the RT and RT+SS groups (p<0.001).CONCLUSION:Static stretching increases cardiac overload and RPE, reducing oxygen supply, especially when performed in combination with RT.
Highlights
Exercises and activities involving muscle stretching have historically been performed before and after physical activities, with the objective of achieving gains in exercise performance and reducing injury risk [1,2]
A Represents a significant difference in heart rate (HR) between Resistance training (RT) and RT + static stretching (SS) postexercise and a significant difference in HR between RT and RT + SS 15 min-post; B Represents a significant difference in HR between RT and SS + RT postexercise, a significant difference in HR between RT and SS + RT 15 min-post and a significant difference in HR between RT and SS + RT 30 min-post; C Represents a significant difference in HR between RT and SS postexercise, a significant difference in HR between RT and SS 30 min-post and a significant difference in HR between RT and SS 45 min-post
D Represents a significant difference in diastolic blood pressure (DBP) between RT and SS postexercise
Summary
Exercises and activities involving muscle stretching have historically been performed before and after physical activities, with the objective of achieving gains in exercise performance and reducing injury risk [1,2]. According to the main studies in the reviewed literature [1,2,3,4], there seems to be no scientific support for this assumption because stretching exercises do not seem to reduce the risk of injury or improve performance. Pope et al [3] noted that there is no scientific evidence for conclusive statements demonstrating. Received for publication on November 28, 2018. Accepted for publication on May 22, 2019
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