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

Not Applicable

Completed

• Conditions: Reaction Time; Endurance Performance; Muscle Strength
• Interventions: Other: exposure to normal light; Other: exposure to blue-enriched light; Other: exposure to bright light

• Registration Number: NCT02203539
• Lead Sponsor: University of Basel

Brief Summary

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.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2014-04-16
• Study Start: 2014-07
• Study First Submitted QC: 2014-07-29
• Study First Posted: 2014-07-30
• Primary Completion: 2015-05
• Study Completion: 2015-05
• Status Verified: 2015-07
• Last Update Submitted: 2015-07-01
• Last Update Posted: 2015-07-02

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 74

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
normal light	exposure to normal light	Intervention: exposure to normal light
blue-enriched light	exposure to blue-enriched light	Intervention: exposure to blue-enriched light
bright light	exposure to bright light	Intervention: exposure to bright light

Primary Outcome Measures

Name	Time	Method
Work performed in kilo Joule (kJ) during the time trial ergometer test adjusted for the VO2peak.	The outcome measure will be assesed at the end of the 12minute time trial ergometer test.	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.

Secondary Outcome Measures

Name	Time	Method
Reaction time in milliseconds (ms)	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.	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.
Maximum handgrip strength in kilo gramm (kg)	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.	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.

Trial Locations

Locations (1)

Department for Sport, Exercise and Health, Section Sports and Exercise Medicine, University of Basel; 🇨🇭 Basel, Switzerland