Caffeine Augments the Prothrombotic but Not the Fibrinolytic Response to Exercise.
Med Sci Sports Exerc
; 51(3): 421-425, 2019 03.
Article
em En
| MEDLINE
| ID: mdl-30395052
ABSTRACT
Caffeine, a popular ergogenic supplement, induces neural and vascular changes that may influence coagulation and/or fibrinolysis at rest and during exercise. PURPOSE:
The purpose of this study was to assess the effect of a single dose of caffeine on measures of coagulation and fibrinolysis before and after a single bout of high-intensity exercise.METHODS:
Forty-eight men (age, 23 ± 3 yr; body mass index, 24 ± 3 kg·m) completed two trials, with 6 mg·kg of caffeine (CAFF) or placebo (PLAC), in random order, followed by a maximal cycle ergometer test. Plasma concentrations of fibrinogen, factor VIII antigen, active tissue plasminogen activator (tPAc), tissue plasminogen activator antigen (tPAg), and active plasminogen activator inhibitor-1 (PAI-1c) were assessed at baseline and immediately after exercise.RESULTS:
Exercise led to significant changes in tPAc (Δ 8.5 ± 4.36 IU·mL for CAFF, 6.6 ± 3.7 for PLAC), tPAg (Δ 2.4 ± 3.2 ng·mL for CAFF, 1.9 ± 3.1 for PLAC), fibrinogen (Δ 30.6 ± 61.4 mg·dL for CAFF, 28.1 ± 66.4 for PLAC), and PAI-1c (Δ -3.4 ± 7.9 IU·mL for CAFF, -4.0 ± 12.0 for PLAC) (all P < 0.05), but no effect of condition or time-condition interactions were observed. Main effects of time, condition, and a significant time-condition interaction were observed for factor VIII, which increased from 1.0 ± 0.4 IU·mL to 3.3 ± 1.3 IU·mL with CAFF and 1.0 ± 0.4 IU·mL to 2.4 ± 0.9 IU·mL with PLAC.CONCLUSIONS:
Coagulation potential during exercise is augmented after caffeine intake, without a similar increase in fibrinolysis. These results suggest caffeine intake may increase risk of a thrombotic event during exercise.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cafeína
/
Fibrinogênio
/
Exercício Físico
/
Ativador de Plasminogênio Tecidual
/
Inibidor 1 de Ativador de Plasminogênio
Tipo de estudo:
Clinical_trials
Limite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Med Sci Sports Exerc
Ano de publicação:
2019
Tipo de documento:
Article