Effect of light intensity on body responses during and after maximal progressive exercise.

Effect of light intensity on cardiovascular and metabolic responses during and after maximal progressive exercise

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

REBEC

Registry ID

RBR-6yggjzm

Enrollment

Registered

2026-05-06

Start date

2022-06-02

Completion date

Unknown

Last updated

2026-06-01

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Men

Interventions

This is a randomized crossover trial involving 16 healthy and physically active men aged 20 to 40 years, in which all 16 participants were exposed to two experimental light conditions, forming two arm

Eligibility

Sex/Gender

Male

Age

20 Years to 40 Years

Inclusion criteria

Inclusion criteria: Men aged 20 to 40 years; normotensive; physically active; non-smokers; with a body mass index less than or equal to 30; without diseases; and not using medications; vitamins; or supplements on a regular basis.

Exclusion criteria

Exclusion criteria: Physically inactive or highly active individuals; hypertensive individuals; obese individuals; those with regular use of medications and those with any disease.

Design outcomes

Primary

Measure	Time frame
To assess whether light intensity alters heart rate, blood pressure, and oxygen consumption during progressive maximal exercise. Verified by electrocardiogram, heart rate monitor, auscultatory method, and blood gas analyzer. The outcome will be confirmed by significant differences (p = 0.05) between bright light and dim light in these parameters.	—

Secondary

Measure	Time frame
Evaluate whether light intensity modifies aerobic power and ventilatory thresholds. Verified by peak oxygen consumption and identification of ventilatory thresholds using a gas analyzer. Confirmed by significant differences (p = 0.05) in peak oxygen consumption, anaerobic threshold, and respiratory compensation point.;Evaluate whether light intensity alters post-exercise autonomic recovery. Verified by heart rate indices obtained during the first 5 minutes of recovery. Confirmed by significant differences (p = 0.05) in these indices between conditions.;Evaluate whether light intensity modifies the reduction in blood pressure and vascular conductance during late recovery. Verified by auscultatory blood pressure and brachial blood flow measured by Doppler ultrasonography. Confirmed by significant differences (p = 0.05) in blood pressure and vascular conductance between conditions.	—

Measure

Time frame

Evaluate whether light intensity modifies aerobic power and ventilatory thresholds. Verified by peak oxygen consumption and identification of ventilatory thresholds using a gas analyzer. Confirmed by significant differences (p = 0.05) in peak oxygen consumption, anaerobic threshold, and respiratory compensation point.;Evaluate whether light intensity alters post-exercise autonomic recovery. Verified by heart rate indices obtained during the first 5 minutes of recovery. Confirmed by significant differences (p = 0.05) in these indices between conditions.;Evaluate whether light intensity modifies the reduction in blood pressure and vascular conductance during late recovery. Verified by auscultatory blood pressure and brachial blood flow measured by Doppler ultrasonography. Confirmed by significant differences (p = 0.05) in blood pressure and vascular conductance between conditions.

—

Countries

Contacts

Public ContactPaulo Ramires

Universidade de São Paulo

ramires@usp.br+55-11-30912133

Outcome results

None listed

Source: REBEC (via WHO ICTRP) · Data processed: Jun 11, 2026