Efeito protetor e potencializador do exercício excêntrico em corredores recreacionais

• Autor(a) principal: BRUNO PAES DE ARRUDA MATOSO
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFMS
• Texto Completo: https://repositorio.ufms.br/handle/123456789/5154
• topic: Efeito Protetor do Exercício; Exercício Excêntrico; Dano Muscular.

Strength exercises with an emphasis on the eccentric phase have the ability to generate positive adaptations from a histological and metabolic point of view, thus reducing parameters that indicate muscle damage. This protective adaptation is referred to as repeated bout effect (RBE) of is characterized by a reduction in loss of muscle function, reduced perception of delayed muscle soreness, and lower levels of creatine kinase (CK). The acute potentiating effect after running exercises has also been described in vertical jumps after incremental tests. The aim of this study is to analyze the RBE with eccentric emphasis on vertical jump performance, dynamic balance and kinematic parameters of running with and without fatigue. Twenty recreational runners were divided into 2 groups, 10 of the experimental group (71.5±10.07kg; 172.2±5.6cm; 32.4±2.9 years; 59.9±8.1 mL/kg/ min), and 10 in the control group (75.1±12.4 kg; 173.5± 6.7 cm; 31.7± 2.6 years; 55.7± 5.6 59.9±8.1 mL/kg/min). Participants performed, over a period of 4 weeks, the incremental test,countermovement jump test, dynamic balance test and two submaximal runs with an initial speed of 8 km/h in the first five minutes and, in the following five minutes, the average speed of the best time in the 10 km test before and after the intervention. In the second and third weeks, a session of the same exercise was applied with an interval of seven days between sessions in the experimental group, with follow-up of delayed muscle soreness at 72 h and CK at 48 h. Participants exhibited higher values of countermovement jump (37.1±1.6 cm) after two sessions of eccentric exercise compared to the control group (32.5±4.8 cm) (p=0.008). There was no difference in dynamic balance (p=0.612), performance of the incremental shuttle run test (p=1.00), and kinematic variables in submaximal running after intervention (p>0.05). The proposed exercise promoted muscle damage, evidenced by the higher values of delayed muscle soreness (5.1±1.9) and CK (515.8±272.1 U·L-1) after the first session with respect to baseline (1.5±0.5; 247.3±122.3 U·L-1) and control group (2.0±0.6; 188.6±70.1 U·L-1) (p=0.038) It is also suggested that the first session offered a protective effect against the muscle damage caused by the second session, evidenced by a lower delayed muscle soreness (3.6±2.0) (p=0.001) and CK (302.9±49.4 U·L- 1) (p=0.005). It is concluded that 2 sessions of an exercise with eccentric emphasis of moderate load increased the performance of the countermovement jump and induced a protective effect already after the second session of the strength exercise with eccentric emphasis.