Endurance Performance, Muscle Strength, Reaction Time
Conditions
Keywords
circadian rhythm, light exposure, exercise capacity, endurance, strength, reaction
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.
Interventions
OTHERexposure to normal light
exposure for 60 minutes in duration
exposure to bright light for 60 minutes of duration
OTHERexposure to blue-enriched light
exposure to blue-enriched light for 60 minutes of duration
Sponsors
University of Basel
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
NONE
Eligibility
Sex/Gender
MALE
Age
18 Years to 35 Years
Healthy volunteers
Yes
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| 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
| Measure | Time frame | Description |
|---|---|---|
| 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. |
Countries
Switzerland
Outcome results
None listed