The Influence of Light Exposure on Exercise Performance Dependent on Chronotype.

N/ACompletedNCT02203539

University of Basel74 enrolled

Overview

The purpose of this study is to determine if an exposure to light in the evening has a positive influence on physical performance regarding endurance, strength and reaction time.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

BASIC_SCIENCE

Masking

NONE

Enrollment

Conditions

Endurance Performance Reaction Time Muscle Strength

Interventions

exposure to normal lightOTHER

exposure for 60 minutes in duration

exposure to bright lightOTHER

exposure to bright light for 60 minutes of duration

exposure to blue-enriched lightOTHER

exposure to blue-enriched light for 60 minutes of duration

Eligibility

Sex: MALEMin age: 18 YearsMax age: 35 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion criteria: * BMI 18 to 30 kg/m2 * endurance performance \>= 55 ml/min/kg peak oxygen uptake Exclusion criteria: * cardiovascular disease * renal dysfunction * shiftworking * travels over time zones in the last 4 weeks * high blood pressure (systolic blood pressure \>170mmHg, diastolic blood pressure \>100mmHg) * depression

Locations (1)

Department for Sport, Exercise and Health, Section Sports and Exercise Medicine, University of Basel

Basel, Switzerland

Outcomes

Primary Outcomes

Work performed in kilo Joule (kJ) during the time trial ergometer test adjusted for the VO2peak.

Participants will perform one baseline test (ergometer ramp test) and seven days later a twelve minute lasting ergometer time trial test which starts 10 minutes after an exposure to light for 60minutes. The work performed in kilo Joule during the time trial ergometer test will be assesed at the end of the time trial and will be the main outcome measure and adjusted for the VO2peak meausred during the baseline test.

Time frame: The outcome measure will be assesed at the end of the 12minute time trial ergometer test.

Secondary Outcomes

Reaction time in milliseconds (ms)

Participants will perform one baseline reaction time task 20 to 15 minutes before the light exposure. 0 to 5 minutes after the 60 minutes lasting light exposure they will perform the reaction task again. The time in milliseconds from the reaction task after the light exposure will be the secondary outcome measure and adjusted for the baseline test before light exposure.

Time frame: Reaction time task will be performed at baseline (20 to 15 minutes before the light exposure) and 0 to minutes after the light exposure which will be the secondary outcome measure.

Maximum handgrip strength in kilo gramm (kg)

Participants will perform one baseline maximum hand grip strength test 15 to 10 minutes before the 60 minutes lasting light exposusre and perform a second test, which will be the outcome measure 5 to 10 minutes after the light exposure. The strength in kg will be adjusted for the strength in kg measured at baseline.

Time frame: Maximum handgrip strength will be tested at baseline (15 to 10 minutes before the light exposure) and 5 to 10 minutes after the 60 minutes lasting light exposure.

Data from ClinicalTrials.gov

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