None listed
Conditions
Interventions
The study consists of five sub studies, all applying the same intervention. The intervention comprises two 6-day supplementation periods either with 140 ml concentrated beetroot juice (containing 800
A. YoYo IRT for team sports (or other team sport specific performance test)
the subjects perform an time to exhaustion test consisting of 2x 20 m shuttles at increasing speed, interfered by a 10 s recovery period between each shuttle. The subject runs until he/she cannot perf
a 30 s all out cycling sprint for short high-intensity sport disciplines (i.e. track cycling, short track ice skating). The performance outcome is the peak and average power output.
C: Rowing ergomet
a 2000 m time trial on a slide II rowing ergometer. The performance outcomes are time to completion and power output.
D: Swimming performance test
a swimming step test consisting of 5x 200 m swimming at increasing intensity. The performance outcomes are time to complete each 200 m and each 100 m split time.
E: Badminton specific performance tes
a change-of-direction speed test performed four times. The performance outcome is the average time to completion of the two best runs.
Amendment 12-okt-2016: Concentrated beetrootjuice (both nitrate-
Sponsors
Maastricht University, Human Movement Sciences / HAN University op Applied Sciences, Institute of Sport and Movement
Eligibility
Inclusion criteria
Inclusion criteria: - Healthy and free from injury/sickness - Athletes of a Dutch national or elite selection of intermittent (team sport) and high-intensity sport disciplines (different disciplines will be investigated in sub studies) - Males and females - 18-40 years
Exclusion criteria
Exclusion criteria: - Use of medication which can influence test performance or blood analysis (e.g. vasodilatators, blood thinners, bronchoconstrictors) - Injury inhibiting the athlete from performing the exercise protocol efficiently - Smoking - Chronic use of nitrate supplements
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Performance based on sport specific testing (depending on sport discipline and performance test; measured as time to completion, total distance covered or power output). The target sample size of 122 is an estimation based on the total number of athletes needed to be screened for all five sub studies to be able to detect significant performance improvement. | — |
Secondary
| Measure | Time frame |
|---|---|
| - Plasma nitrite - Plasma nitrate - Heart rate | — |
Contacts
Public ContactKristin Jonvik
HAN University op Applied Sciences
Outcome results
None listed