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Abstract Aim: Determine the relationship between changes in oxidative stress markers, muscle damage, DOMS, and their relationship with performance in response to a session of football training during a 1-week recovery period of young football players. Methods: Nineteen young football players aged 16.7±1.0 years were included in the study. After initial evaluation for basal levels of oxidative stress and muscle damage markers, DOMS, and performance testing (Vertical Jump, Agility T-test, and RAST potency test), the athletes were submitted to a routine training session composed of squatting exercises, followed by a simulated football match of 45 minutes. Athletes were reevaluated for 3 consecutive days (24h, 48h, and 72h after the training session) during the recovery week. Results: An elevated DOMS score in the quadriceps and posterior thigh (P

O fato de que a maturação biológica exerce grande impacto sobre os aspectos físicos de jovens jogadores de futebol fez com que muito conhecimento acerca desse aspecto fosse produzido. Em virtude disso, poucas investigações sobre o aspecto técnico têm sido produzidas em atletas jovens, ocasionando uma carência de informações desse atributo durante a formação do atleta. Assim, o objetivo deste estudo foi verificar a relação entre testes de habilidades específicas para o futebol em jovens atletas com diferentes estágios de maturidade. A amostra foi composta por 59 atletas do sexo masculino, com a idade entre 11 e 17 anos, separados em dois grupos (sub 14 e sub 17) de acordo com os estágios de maturação. A idade cronológica foi determinada de forma centesimal e a idade óssea foi avaliada por radiografia de mão e punho. Seis testes de habilidades específicas para o futebol foram aplicados. Os resultados mostraram para os atletas do grupo sub 14, correlações significantes entre os testes de CBLR e CBLS (r=0,82; p

BACKGROUND:Capillary rather than venipuncture may be a simpler and less invasive blood collection protocol that would increase the number of potential sampling tests. However, if capillary sampling can be used as an alternative to venipuncture to determine changes in plasma, total creatine kinase (CK) activity in response to a football training session is poorly known. OBJECTIVE:This study aims to determine whether capillary blood sampling would provide representative measures of total CK activity compared to venipuncture in response to a football training session-induced elevated CK plasma levels. METHODS:Twenty-two players from an under-19 football team performed a simulated football match with 11 players on each team for 90 minutes total duration (two halves of 45 minutes with 15 minutes rest between). Venous and ear lobe capillary blood samples were collected before and after (24h and 48h) the training session. Athletes retested for three consecutive days after exercise during the recovery week. RESULTS:The simulated match significantly increased (P< 0.05) total CK activity as determined in both venous (1.7-fold) and capillary (1.9-fold) blood sampling. Total CK activity determined using capillary samples demonstrated significant correlation (r = 0.85; P < 0.01) and an elevated concordance Lin index (pc = 0.80) when compared to venous sampling total CK. The Bland-Altman plot showed capillary sampling CK overestimated venous CK levels by 130 U/L (61%), with moderated variance and low bias. CONCLUSIONS:Our results demonstrated that capillary sampling for total CK activity assay may be considered a reliable alternative to venipuncture to determine changes in plasma total CK activity in response to a football training session.