The Effects of High Intensity Interval Exercise in Obese

Not Applicable

Completed

• Conditions: Endothelial Dysfunction; Obesity
• Interventions: Procedure: HIIE 1; Procedure: HIIE 3; Procedure: Control

• Registration Number: NCT03376906
• Lead Sponsor: Federal University of Paraíba

Brief Summary

Obesity is a complex and multifactorial disease. Excess weight is related to endothelial dysfunction, inflammation and oxidative stress which increases the risk for cardiovascular diseases. High-intensity interval exercise can release vasodilatory substances and promote increased muscle blood flow.

Detailed Description

This study evaluated the effects of the recovery interval duration (1 vs. 3 min) in high intensity interval exercise (HIIE) on the hemodinamics responses in obese individuals. Twelve obese subjects (27 ± 3.8 yrs) were evaluated, who underwent three experimental sessions with a randomized crossover design: one control session (no exercise) and two HIIE sessions with the same workload (10 x 1min @92%VO2max / 1\[HIIE 1\] or 3\[HIIE 3\] min @0%). Forearm blood flow (FBF) and blood pressure (BP) were measured before and after the experimental sessions. Heart rate and relative perceived exertion were assessed during HIIE.

Study Timeline

• Study Start: 2016-06-05
• Primary Completion: 2016-12-20
• Study Completion: 2017-01-30
• Study First Submitted: 2017-02-20
• Status Verified: 2017-12
• Study First Submitted QC: 2017-12-13
• Last Update Submitted: 2017-12-13
• Study First Posted: 2017-12-19
• Last Update Posted: 2017-12-19

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 12

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Obese Subjetcs	HIIE 1	The subjects were welcomed for a visit to the Laboratory of Studies of Physical Training Applied to Health, where they performed an evaluation of body composition, maximal ergospirometric exercise test, and three experimental sessions (HIIE 1, HIIE 3 and Control) in a random order, which were performed with a 96 h interval between them.
Obese Subjetcs	Control	The subjects were welcomed for a visit to the Laboratory of Studies of Physical Training Applied to Health, where they performed an evaluation of body composition, maximal ergospirometric exercise test, and three experimental sessions (HIIE 1, HIIE 3 and Control) in a random order, which were performed with a 96 h interval between them.
Obese Subjetcs	HIIE 3	The subjects were welcomed for a visit to the Laboratory of Studies of Physical Training Applied to Health, where they performed an evaluation of body composition, maximal ergospirometric exercise test, and three experimental sessions (HIIE 1, HIIE 3 and Control) in a random order, which were performed with a 96 h interval between them.

Primary Outcome Measures

Name	Time	Method
Forearm Blood Flow and Vascular Conductance	Up to 2 years	Forearm muscular blood flow was obtained through the venous occlusion plethysmography technique (19). For this, a silicon tube filled with mercury and connected to a low-pressure transducer was placed around the forearm, 5 cm away from the humeral-radial joint, connected to a plethysmograph (Hokanson® / EC6 plethysmograph, Bellevue, Washington, USA). A cuff was placed around the wrist and another at the upper arm, and the wrist cuff was inflated to a supra-systolic level every 1 min before measurements start. The arm cuff was inflated above the venous pressure at 10 s intervals for a period of 7 to 8 s. The increase in tension in the silastic tube reflects the increase in the volume of the forearm, which indicates vasodilation. The muscle flow wave signal was collected and stored on the WINDAQ DI 200 DATAQ program. Vascular conductance in the forearm was calculated by the blood flow ratio in the forearm (mL.min-1.100mL-1) and mean arterial pressure (mmHg) multiplied by 100.

Secondary Outcome Measures

Name	Time	Method
Heart rate	Up to 2 years	Heart rate was monitored throughout the exercise session using a Polar RS800CX monitor (Polar®, Kempele, Finland).
Blood pressure	Up to 2 years	Blood pressure values were obtained in a non-invasive manner, using an oscillometric method (Dixtal®, DX 2020; Manaus, Amazonas, Brazil). The occlusive cuff was positioned on the left ankle of the subject and was inflated minute by minute, providing systolic (SBP), diastolic (DBP) and mean (MBP) blood pressure values. For electrocardiogram (ECG) acquisition, three electrodes were placed on the thorax of the subjects in the bipolar position and DII derivation. After pre-amplification of the ECG signal, a conversion from analog to digital was performed, and later stored in a computer and processed by the WINDAQ DI-200 program (WinDaq DI-200, Akron, Ohio).