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Completed

NCT Number: NCT02203539

The Influence of Light Exposure on Exercise Performance Dependent on 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.

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Key information

Conditions

Endurance Performance Muscle Strength Reaction Time

Age range

18 year–35 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

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

Basel, 4052, Switzerland

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

exposure to normal light

Other

exposure for 60 minutes in duration

exposure to bright light

Other

exposure to bright light for 60 minutes of duration

exposure to blue-enriched light

Other

exposure to blue-enriched light for 60 minutes of duration

Primary outcomes

  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 outcomes

  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.

Sponsors and collaborators

Lead sponsor

University of Basel

Other

Registry information

Official study title

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

Acronym: EX-Light

Important dates

Study start
2014
Primary completion
2015
Study completion
2015
First posted
Jul 30, 2014
Registry last updated
Jul 2, 2015

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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