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Neuromuscular Responses to Simulated Brazilian Jiu-Jitsu Fights

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Corrêa da Silva B. V., Neme Ide B., de Moura Simim M. A., Marocolo M., da Mota G. R.
Journal of Human Kinetics
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2014
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vol. 44
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issue 1
249-257
EN
The aim of this study was to investigate the neuromuscular performance responses following successive Brazilian Jiu-Jitsu (BJJ) fights. Twenty-three BJJ athletes (age: 26.3 ± 6.3 years; body mass: 79.4 ± 9.7 kg; body height: 1.80 ± 0.1 m) undertook 3 simulated BJJ fights (10 min duration each separated by 15 min of rest). Neuromuscular performance was measured by the bench press throw (BPT) and vertical counter movement jump (VCMJ) tests, assessed before the 1st fight (Pre) and after the last one (Post). Blood lactate (LA) was measured at Pre, 1 min Post, and 15 min Post fights. Paired t-tests were employed in order to compare the BPT and VCMJ results. One-way ANOVA with Bonferroni post hoc tests were utilized to compare LA responses. The results revealed a significant (p < 0.05) increase in VCMJ performance (40.8 ± 5.5 cm Pre vs. 42.0 ± 5.8 cm Post), but no significant changes in the BPT (814 ± 167 W Pre vs. 835 ± 213 W Post) were observed. LA concentration increased significantly (p < 0.05) at Post, both in the 1st min [...] and the 15th min [...] of recovery. We concluded that successive simulated BJJ fights demanded considerable anaerobic contribution of ATP supply, reinforcing the high-intensity intermittent nature of the sport. Nevertheless, no negative impact on acute neuromuscular performance (power) was observed.
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Optimizing the load for peak power and peak velocity development during resisted sprinting

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Matusiński A., Gołaś A., Zając A., Nitychoruk M., Maszczyk A.
Physical Activity Review
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2021
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vol. 1
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issue 9
128-134
EN
Introduction: Resistance towing is perhaps the most specific form of developing strength and power in muscles involved directly during the start, acceleration and at maximum speed. Resisted sprint training may involve towing a sled which provides an overload through the friction between the sled and ground surface or a modern advanced training device which uses drag technology to provide fully controlled resistance during the movement, such as the 1080 Sprint. The main objective of the study was to evaluate the optimal loading for the development of power in the engine assisted drag technology system SPRINT 1080. Material and methods: We evaluated the changes in running velocity and the generated force and power during resisted sprints over 30m with a load of 1, 3, 6, 9, 12 and 15 kg. Seven male sprinters with national and international experience participated in the study. Their average age, body mass and body height were 22.2 ± 2.4 years, 77.43 ± 4.63 kg, and 178.6 ± 3.2 cm, respectively. All athletes performed six 30 m sprints with 5 min rest intervals in between. The first sprint was performed without additional resistance, while the remaining 5 were performed in an random order with additional resistance of 3, 6, 9, 12 and 15 kg. After receiving a verbal signal, the participant started at will from a semi crouched position. During the resisted sprint trials, the time [s] and the following variables were recorded in peak values: power output [W], generated force [N], and sprinting velocity [m/s]. Results: Our results show that loading with 6 kg decreased sprinting velocity by 9.37% while the generated horizontal power increased by 31,32%. The 6 kg loading on the Sprint 1080device corresponded to 8% body mass, yet as mentioned before the baseline results were not fully free sprinting as the tested athletes reached velocities 0.5-0.6 m/s greater without the harness. Conclusion: Taking into account this fact, our results seem to confirm previous findings, that external loads between 8 and 13% may be optimal for improving power and sprinting speed at the same time.
3
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Factors determining the functional abilities of patients after stroke

88%
Kubielska J., Kostka J., Miller E.
Advances in Rehabilitation
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2020
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vol. 34
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issue 3
8-14
EN
Introduction The purpose of the study was to assess the functional abilities of patients after stroke and to identify factors that affect it. Material and methods The study was performed on 40 patients after stroke. To assess functional ability the Rivermead Motor Assessment (RMA), Barthel Index (BI), Tinetti test, and Up&Go test were used. The maximum muscle power (Pmax), optimal shortening velocity (Vopt), muscle strength, one-leg standing test, Geriatric Depression Scale (GDS), pain assessment (Numeric Pain Scale), nutrition assessment (Mini Nutritional Assessment Scale - MNA) were also performed. Results Functional performance was influenced by: knee flexors on the affected side (correlations respectively: RMA rho=0,37; p=0,04; Tinetti test rho=0,44; p<0,01; Up&Go test rho=-0,56; p<0,001), balance time on a non-affected leg (RMA rho=0,38; p=0,03; BI rho=0,41; p=0,01; test Tinetti rho=0,64; p<0.001; Up&Go test rho=-0.47; p=0.003), Pmax (RMA rho=0,35; p=0,04; Tinetti test rho=0,49; p<0,01; Up&Go test rho=-0,63; p<0.001), reporting problems with sitting and standing up (RMA p=0,003; Tinetti test p=0,02; Up&Go test p=0.049), using orthopedic assistance (RMA global functions p=0,01; RMA lower limb and torso p=0,04; BI p=0,003; Tinetti test p<0,001, Up&Go test p<0,001). The MNA result was correlated with RMA (rho=0,36; p ,0.04), no correlation was obtained for any of the functional tests with the extensor muscle strength on the non-affected side, GDS and pain level. Conclusions The functional ability of stroke patients is affected by knee flexors on the affected side, the ability to maintain balance, and maximum muscle power. People, who reported problems with sitting and standing up and using orthopedic assistance, are characterized by worse ability.
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Relationship Between Performance Characteristics and the Selection Process in Youth Soccer Players

88%
Lago-Peñas C., Rey E., Casáis L., Gómez-López M.
Journal of Human Kinetics
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2014
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vol. 40
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issue 1
189-199
EN
The purpose of this study was to establish the anthropometric and physical profiles of elite young soccer players according to their playing position, and to determine their relevance for the selection process. One hundred and fifty-six young male soccer players participated in the study. Players were classified into the following groups: Goalkeepers (n=16), Central Defenders (n=26), External Defenders (n=29), Central Midfielders (n=34), External Midfielders (n=28), and Forwards (n=23). Anthropometric variables of participants (body height, body mass, body mass index, 6 skinfolds, 4 diameters, and 3 perimeters) were measured. Participants performed the Yo-Yo test, sprint tests (30 m flat sprint and Balsom agility test) and 2 jump tests (countermovement jump and the Abalakov test). At the end of the season, the technical staff of the club selected some of the players to continue playing on the same team and the rest were not selected. The results show that heavier and taller outfield players performed better in vertical jumps and sprint tests, whereas leaner outfield players performed better in the Yo-Yo test. Fat percentage of selected players was lower than that of the non-selected ones. The rest of the body components were similar in the selected and non-selected players within each playing position. Moreover, the selected players performed slightly better than the non-selected players in the physical test, but these differences were not statistically significant.
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