Muscle fatigue, Mental Fatigue, caffeine supplementation
Conditions
Interventions
Fifteen healthy male Physical Education students, with large experience in running on treadmill (aged 25 ± SD 7 years, weight 75.3 ± 3.6 kg, height 176.1 ± 4.0 cm) participated in a caffeine suppleme
Dietary supplement
G11.427.590.530.698.277
SP6.051.227
Sponsors
Erico Chagas Caperuto
Elias de França
Eligibility
Sex/Gender
Male
Age
18 Years to 40 Years
Inclusion criteria
Inclusion criteria: Healthy participants which did not use any ergogenic supplements in the last 6 months preceding the test.
Exclusion criteria
Exclusion criteria: Individuals without previous experience in running on the treadmill; intolerant individuals to caffeine use.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| It was evaluated the rest time interval (ITD) choice between running series after caffeine or placebo supplementation. To do this, one of the researchers registered (manually with a sports timer) the RTI of each series (to perform matched comparisons between placebo and caffeine situation). The total time to volitional exhaustion was also evaluated. For this, the total running time in both situations were recorded (manually with a sports timer) (for a matched comparison between situations, caffeine and placebo).;Expected Outcomes The rest time interval between sets would be lower for the caffeine supplementation condition, hence the total running time (time to exhaustion) could decrease.;Observed outcomes The rest time interval (RTI) between the running sets in the caffeine condition was lower than in the placebo situation. In addition, in the caffeine supplementation situation individuals ran longer (i.e. they increased the time to exhaustion, even with a lower RTI than in the placebo-supplemented condition). | — |
Secondary
| Measure | Time frame |
|---|---|
| It was measured before the start of the test (i.e., at rest) immediately after each exercise bout and at the end the following variables: Ratio perceived exertion (by Borg scale), Heart Rate (with a Polar S810i series heart rate monitor, with HR measurement capacity every 5 s) and blood lactate concentration (through the YSI 1500 Sport Lactate Analyzer ™; device with an error up to 0.10 ± 5 mmol/L). The collection of blood samples for [La]p analysis was obtained by collecting around 100 µl/l of blood from the ring finger of the participants’ right hand (for that we used an automatic Softclix II AccuCheck lancing device from Roche and the blood was collected to a heparin capillary tube ), then, it was injected into the lactate analyzer device using a 50 µl/l pipette. The collection at rest was made before the start of the laboratory test run, 55 minutes after CAF or PLA supplementation. The same three researchers collected all data from exercise bouts, one for blood collection, one for collection of HR and the third for RPE report according to the Borg scale.;Expected Outcomes In exercise, the subjective perception of effort would be lower for the caffeine supplemented condition than the placebo-supplemented condition. Both at rest and in exercise blood lactate and heart rate concentrations would be higher for the caffeine-supplemented condition than the placebo-supplemented condition. ;Observed outcomes Both at rest and in exercise, there were no significant differences in the ratio of perceiver exertion, heart rate or blood lactate concentrations between the caffeine and placebo supplementation situations. | — |
Countries
Brazil
Contacts
Public ContactElias de França
Universidade São Judas Tadeu
Outcome results
None listed