![]() However, research has shown that non-modifiable Involved in predicting vulnerability to hamstrings injury is important for designingĮxercise-based programs that aim to mitigate the rate and severity of hamstrings injuriesĪnd improve rehabilitation strategies. The incidence and recurrence of hamstrings injuries are very high in sports, posingĮlevated performance and financial-related costs. Most of these methods need expensive materials and equipment that preclude its applicability for most athletes and thus its implementation in most soccer training facilities so strength and conditioning coaches are advised to find valid, simple, and economic resources for this purpose (Raya-González et al., 2020). Although different RT methodologies have been used to improve physical performance in soccer, such as programs bases on traditional exercises (Spineti et al., 2016), eccentric-overload training (Suárez-Arrones et al., 2019), plyometric training (Haghighi et al., 2012 Falces-Prieto et al., 2021), ballistic exercises (Loturco et al., 2020), Olympic exercises (Hori et al., 2008), electrostimulation training (Billot et al., 2010), and a combination of different methods (Raya-González and Sánchez-Sánchez, 2018). Concerning young athletes, it has shown RT to be important in preadolescence, highlighting neural plasticity associated with prepubertal players that support muscular strength development in these years through gains in neuromuscular adaptations as intra-and intermuscular coordination (Peña-González et al., 2019). In addition, we observed that the 6-week HIFt was able to generate functional adaptations only in countermovement jump and lower limb muscle power. Conclusions: The internal training load varied significantly only from weeks 1 to 3 over the 6 weeks. In addition, the practitioners obtained superior results in countermovement jump (t = 3.573 p = 0.005) and lower limb muscle power (t = 3.536 p = 0.005) after the 6 weeks. Results: A constant dynamic of the weekly internal training loads and the mean internal training loads was observed, with difference in the results from weeks 1 to 3 (F = 3.283 p = 0.02). In addition, the athletes underwent sprint, countermovement jump, and handgrip strength tests before and after the 6 weeks of HIFt. the sum and average of the weekly loads of training, strain, monotony, and acute/chronic workload ratio were recorded for analysis. ![]() the session rating of perceived exertion was routinely collected after each training session for 6 weeks. Methods: The study included 12 practitioners (4 men and 8 women age: 31.08 ± 4.80 years) of HIFt. Purpose: The present study aimed to analyse the behaviour of training loads and evaluate specific aspects of physical fitness during a period of 6 weeks in high-intensity functional training (HIFt) practitioners. Therefore, it seems likely there are underlying strength qualities that are common to the hang power clean, jumping, and sprinting. There were significant correlations between most of, but not all, combinations of performances of hang power clean, jumping, sprinting, COD, maximum strength, and power. However, there was no significant difference between groups in 5-5 COD time, possibly because of important contributing factors other than strength and power. The top half group possessed higher maximum strength (P < 0.01), power (P < 0.01), performance of jumping (P < 0.05), and sprinting (P < 0.01). In addition, Pearson's product moment correlations between measurements were calculated among all subjects (n = 29). The subjects were divided into top and bottom half groups (n = 14 for each group) based on their 1RM hang power clean score relative to body mass, then measures from all other tests were compared with one-way analyses of variance. Twenty-nine semiprofessional Australian Rules football players (age, height, and body mass : 21.3 +/- 2.7 years, 1.8 +/- 0.1 m, and 83.6 +/- 8.2 kg) were tested for one repetition maximum (1RM) hang power clean, 1RM front squat, power output during countermovement jump with 40-kg barbell and without external load (CMJ), height of CMJ, 20-m sprint time, and 5-5 COD time. As the secondary purpose, relationships between hang power clean performance, maximum strength, power and performance of jumping, sprinting, and COD also were investigated. The primary purpose of this study was to investigate whether the athlete who has high performance in hang power clean, a common weightlifting exercise, has high performances in sprinting, jumping, and changing of direction (COD).
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