A sportomics soccer investigation unveils an exercise-induced shift in tyrosine metabolism leading to hawkinsinuria.

Tyrosine metabolism has an intense role in the synthesis of neurotransmitters. Our study used an untargeted, sportomics-based analysis of urine samples to investigate changes in metabolism during a soccer match in 30 male junior professional soccer players. Samples were collected before and after the match and analyzed using liquid chromatography and mass spectrometry.

Which parameters to use for sleep quality monitoring in team sport athletes? A systematic review and meta-analysis.

Background: Sleep quality is an essential component of athlete's recovery. However, a better understanding of the parameters to adequately quantify sleep quality in team sport athletes is clearly warranted.

Objective: To identify which parameters to use for sleep quality monitoring in team sport athletes.

Improving Sprint Performance in Soccer: Effectiveness of Jump Squat and Olympic Push Press Exercises.

Training at the optimum power load (OPL) is an effective way to improve neuromuscular abilities of highly trained athletes. The purpose of this study was to test the effects of training using the jump squat (JS) or Olympic push-press (OPP) exercises at the OPL during a short-term preseason on speed-power related abilities in high-level under-20 soccer players. The players were divided into two training groups: JS group (JSG) and OPP group (OPPG).

Caffeine decreases systemic urea in elite soccer players during intermittent exercise.

Purpose: We investigated the effects of caffeine on the ammonia and amino acid metabolism of elite soccer players.

Methods: In this double-blind randomized study, athletes (n = 19) received 5 mg·kg caffeine or lactose (LEx, control) and performed 45 min of intermittent exercise followed by an intermittent recovery test (Yo-Yo IR2) until exhaustion. The caffeine-supplemented athletes were divided into two groups (CEx and SCEx) depending on their serum caffeine levels (<900% and >10,000%, respectively).

Effect of caffeine supplementation on haematological and biochemical variables in elite soccer players under physical stress conditions.

Objective: To evaluate the effect of caffeine on white cell distribution and muscle injury markers in professional soccer players during exercise.

Methods: 22 male athletes completed a placebo controlled double blind test protocol to simulate a soccer match, followed by a Yo-Yo intermittent recovery test.

Results: Exercise caused an increase in packed cell volume that was enhanced by caffeine.