ORCID Profile
0000-0003-4609-069X
Current Organisation
Universidade Federal de Alagoas
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Publisher: Informa UK Limited
Date: 30-11-2021
Publisher: Informa UK Limited
Date: 27-07-2022
DOI: 10.1080/10408398.2022.2104807
Abstract: While the effects of caffeine ingestion on endurance performance are well known, its effects on cardiopulmonary responses during a maximal graded exercise test have been less explored. This study systematically reviewed and meta-analyzed studies investigating the effects of caffeine ingestion on cardiopulmonary responses during a maximal graded exercise test. A search was performed in four databases, and study quality was assessed using the PEDro scale. Data reported by the selected studies were pooled using random-effects meta-analysis, with selected moderator effects assessed via meta-regression. Twenty-one studies with good and excellent methodological quality were included in this review. Compared to placebo, caffeine increased peak minute ventilation (SMD = 0.33 p = 0.01) and time to exhaustion (SMD = 0.41 p = 0.01). However, meta-regression showed no moderating effects of dosage and timing of caffeine ingestion, stage length, or total length of GXT (all p > 0.05). Caffeine ingestion did not affect peak oxygen uptake (SMD = 0.13 p = 0.42), peak heart rate (SMD = 0.27 p = 0.07), peak blood lactate concentration (SMD = 0.60 p = 0.09), peak tidal volume (SMD = 0.10 p = 0.69), peak breathing frequency (SMD =0.20 p = 0.23), or peak power output (SMD = 0.22 p = 0.28). The results of this systematic review with meta-analysis suggest that caffeine increases time to exhaustion and peak minute ventilation among the cardiopulmonary variables assessed during GXT.
Publisher: Wiley
Date: 13-07-2020
DOI: 10.1111/SMS.13749
Abstract: The purpose of this study was to investigate whether variations in 163 C A CYP1A2 genotypes (rs 762 551) (AA, AC, and CC) modify the ergogenic effects of caffeine (CAF) on strength, power, muscular endurance, agility, and endurance in adolescent athletes. One hundred adolescents (age = 15 ± 2 years) were recruited. Participants ingested CAF (6 mg.kg −1 ) or placebo (PLA, 300 mg of cellulose) 1 hour before performing a sequence of physical tests: handgrip strength, vertical jumps, agility test, sit‐ups, push‐ups, and the Yo‐Yo intermittent recovery test level 1 (Yo‐Yo IR1). Compared to PLA, CAF enhanced ( P .05) sit‐up (CAF = 37 ± 9 PLA = 35 ± 8 repetitions) and push‐up repetitions (CAF = 26 ± 11 PLA = 24 ± 11 repetitions), and increased distance covered in Yo‐Yo IR1 test (CAF = 1010.4 ± 378.9 PLA = 903.2 ± 325.7 m). There was no influence of CAF on handgrip strength (CAF = 35.1 ± 8.9 PLA = 33.7 ± 8.7 kgf), countermovement jump height (CAF = 49.3 ± 12.6 PLA = 47.9 ± 13.8 cm), spike jump height (CAF = 54.2 ± 13.6 PLA = 52.9 ± 14.5 cm), and time in agility test (CAF = 15.8 ± 1.1 PLA = 15.9 ± 1.3 s, P .05). When present, the ergogenic effect of CAF was not dependent of genotype. CAF improves muscular endurance and aerobic performance in adolescent athletes, regardless of their 163 C A CYP1A2 genotype.
Publisher: Springer Science and Business Media LLC
Date: 16-11-2022
DOI: 10.1007/S00394-022-03045-0
Abstract: This study investigated the influence of the different genotypes of ADORA2A (1976 C > T, rs 5751876), alone or pooled with CYP1A2 (163 C > A rs 762551) genotypes, on the ergogenic effects of caffeine (CAF) on various aspects of physical performance in male adolescent athletes. Ninety male adolescent athletes (age = 15.5 ± 2 years) were classified according to their genotypes for 1976 C > T ADORA2A (TT homozygous or C CAF enhanced handgrip strength (CAF: 35.0 ± 9.2 kg force PLA: 33.5 ± 8.9 kg force p = 0.050), CMJ height (CAF: 49.6 ± 12.3 cm PLA: 48.3 ± 13.6 cm p = 0.013), SJ height (CAF: 54.7 ± 13.3 cm PLA: 53.1 ± 14.8 cm p = 0.013), number of sit-ups (CAF: 37 ± 8 PLA: 35 ± 8 p = 0.001), and distance covered on the Yoyo IR1 test (CAF: 991.6 ± 371.0 m PLA: 896.0 ± 311.0 m p = 0.001), This CAF-induced improvement on exercise performance was, however, independent of genotypes groups (all p > 0.05). CAF had no effect on agility (CAF: 15.8 ± 1.2 s PLA: 15.9 ± 1.3 s p = 0.070) and push-up (CAF: 26.6 ± 12.0 PLA: 25.0 ± 11.0 p = 0.280) tests. The acute caffeine intake of 6.0 mg.kg
Publisher: Wiley
Date: 17-02-2019
DOI: 10.1111/SMS.13393
Abstract: We tested the hypothesis that carbohydrate ingestion during exercise improves time trial (TT) performance and that this carbohydrate-induced improvement is greater when carbohydrates are ingested during exercise in a fasted rather than a fed state. Nine males performed 105 minutes of constant-load exercise (50% of the difference between the first and second lactate thresholds), followed by a 10-km cycling TT. Exercise started at 9 am, 3 hours after either breakfast (FED, 824 kcal, 67% carbohydrate) or a 15-hour overnight fast (FAST). Before exercise, after every 15 minutes of exercise and at 5 km of the TT, participants ingested 2 mL kg Irrespective of the fasting state, when carbohydrate was ingested during exercise, the rating of perceived exertion (RPE) was lower throughout the constant-load exercise, while the plasma glucose concentration and carbohydrate oxidation were higher during the last stages of the constant-load exercise (P < 0.05). Consequently, TT performance was faster when carbohydrate was ingested during exercise (18.5 ± 0.3 and 18.7 ± 0.4 minutes for the FEDCHO and FASTCHO conditions, respectively) than when the placebo was ingested during exercise (20.2 ± 0.8 and 21.7 ± 1.4 minutes for the FEDPLA and FASTPLA conditions, respectively), regardless of fasting. These findings indicate that even when breakfast is provided before exercise, carbohydrate ingestion during exercise is still beneficial for exercise performance. However, ingesting carbohydrate during exercise can overcome a lack of breakfast.
Publisher: Informa UK Limited
Date: 04-04-2022
Publisher: Informa UK Limited
Date: 13-09-2022
Location: Brazil
No related grants have been discovered for Gustavo de Araujo.