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

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ClinicalTrials.gov Identifier: NCT02203539
Recruitment Status : Completed
First Posted : July 30, 2014
Last Update Posted : July 2, 2015
Sponsor:
Information provided by (Responsible Party):
Arno Schmidt-Trucksäss, 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.

Condition or disease Intervention/treatment Phase
Endurance Performance Reaction Time Muscle Strength Other: exposure to normal light Other: exposure to bright light Other: exposure to blue-enriched light Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 74 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Official Title: The Influence of Different Light Exposures on Endurance Performance, Handgrip Strength and Reaction Time in Consideration of the Chronotype.
Study Start Date : July 2014
Actual Primary Completion Date : May 2015
Actual Study Completion Date : May 2015

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




Primary Outcome Measures :
  1. Work performed in kilo Joule (kJ) during the time trial ergometer test adjusted for the VO2peak. [ Time Frame: 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 :
  1. Reaction time in milliseconds (ms) [ 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. ]
    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.

  2. Maximum handgrip strength in kilo gramm (kg) [ 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. ]
    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.



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Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes
Criteria

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

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02203539


Locations
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Switzerland
Department for Sport, Exercise and Health, Section Sports and Exercise Medicine, University of Basel
Basel, Switzerland, 4052
Sponsors and Collaborators
University of Basel
Investigators
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Principal Investigator: Arno Schmidt-Trucksäss, Prof Dr Departement of Sports, Exercise and Health, University of Basel
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Responsible Party: Arno Schmidt-Trucksäss, Prof Arno Schmidt-Trucksäss, MD, MA, University of Basel
ClinicalTrials.gov Identifier: NCT02203539    
Other Study ID Numbers: EKNZ 2014-056
First Posted: July 30, 2014    Key Record Dates
Last Update Posted: July 2, 2015
Last Verified: July 2015
Keywords provided by Arno Schmidt-Trucksäss, University of Basel:
circadian rhythm
light exposure
exercise capacity
endurance
strength
reaction