Bright light influence on blood vessel response to hand exercise

Not Applicable

• Conditions: healthy young adult; sedentary behavior; 53386

• Registration Number: RBR-5msn9mw
• Lead Sponsor: Escola de Educação Física e Esporte da Universidade de São Paulo

Brief Summary

Pre-exercise values were similar between the experimental conditions. For vascular variables, during exercise, blood flow, vascular conductance and shear rate increased in the three conditions. However the increase was higher during CE compared to CC (+19%, +15% and +14%, respectively), and PN (+12%, +11% and +10%, respectively). Diameter increased similarly during exercise under the three conditions. For systemic variables, there was an increase during exercise for systolic, mean and diastolic blood pressures as well as for heart rate. However, the increase was higher for for systolic and mean blood pressures during PN compared to CC (+22% and +23%, respectively) and CE (+22% and +23%,respectively). In conclusion, bright light potentiates vasodilation in active muscle during a small-muscle mass exercise model.

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Completion: 2021-07-30
• Study Start: 2021-12-02
• Last Update Posted: 29 May 2023

Recruitment & Eligibility

• Status: Recruitment completed
• Sex: Male
• Target Recruitment: Not specified

Inclusion Criteria

Men; Aging between 20 and 39 years old

Exclusion Criteria

Body mass index higher than 30kg/m²; Blood pressure levels above139/89 mmHg; Presence of cardiovascular disease; Smoking; Be physicaly active; Use of regular medications; Take supplements; Presence of an extreme chronotypes

Study & Design

• Study Type: Intervention
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
The greater vasodilation promoted by dynamic handgrip exercise evaluated by doppler ultrasound of the braquial artery when the individuals were under bright light exposure.

Secondary Outcome Measures

Name	Time	Method
The greater increase of vascular conductance (Blood flow/Mean blood presure), arterial diameter (ultrasound), and lower increase of blood pressure (fotpletysmography) and heart rate (ECG) promoted by dynamic hangrip exercise when the individuals were under bright light exposure.