The Influence of Light Exposure on Exercise Performance Dependent on Chronotype. (EX-Light)

The Influence of Different Light Exposures on Endurance Performance, Handgrip Strength and Reaction Time in Consideration of the Chronotype.

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 Overview

• Status: Completed
• Conditions: Muscle Strength; Endurance Performance; Reaction Time
• Intervention / Treatment: Other: exposure to bright light; Other: exposure to blue-enriched light; Other: exposure to normal light

• Study Type: Interventional
• Enrollment (Actual): 74
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Switzerland
  • Basel, Switzerland, 4052
    • Department for Sport, Exercise and Health, Section Sports and Exercise Medicine, University of Basel

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 35 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Male

Description

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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: bright light; Intervention: exposure to bright light	Other: exposure to bright light; exposure to bright light for 60 minutes of duration
Experimental: blue-enriched light; Intervention: exposure to blue-enriched light	Other: exposure to blue-enriched light; exposure to blue-enriched light for 60 minutes of duration
Experimental: normal light; Intervention: exposure to normal light	Other: exposure to normal light; exposure for 60 minutes in duration

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
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.	The outcome measure will be assesed at the end of the 12minute time trial ergometer test.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
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.	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.	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.

Collaborators and Investigators

• Sponsor: University of Basel
• Investigators: Principal Investigator: Arno Schmidt-Trucksäss, Prof Dr, Departement of Sports, Exercise and Health, University of Basel

Study record dates

Study Major Dates

• Study Start: July 1, 2014
• Primary Completion (Actual): May 1, 2015
• Study Completion (Actual): May 1, 2015

Study Registration Dates

• First Submitted: April 16, 2014
• First Submitted That Met QC Criteria: July 29, 2014
• First Posted (Estimate): July 30, 2014

Study Record Updates

• Last Update Posted (Estimate): July 2, 2015
• Last Update Submitted That Met QC Criteria: July 1, 2015
• Last Verified: July 1, 2015

More Information

Terms related to this study

• Keywords: exercise capacity; circadian rhythm; light exposure; endurance; strength; reaction
• Other Study ID Numbers: EKNZ 2014-056

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No