scholarly journals Efeitos de campo operacional de instrução sobre aptidão física, dano muscular e controle autonômico de alunos do NPOR do Exército Brasileiro

Author(s):  
Léo Dutra Cabistany ◽  
Victor Silveira Coswig ◽  
Marcelo Vaz ◽  
Fabrício Boscolo Del Vecchio

Introdução: O Campo Operacional de Instrução (COI) demanda elevado esforço físico e mental.Objetivo: Avaliar os efeitos das atividades de treinamento militar sobre indicadores de dano muscular periférico, de controle autonômico e de aptidão física em alunos do Núcleo de Preparação de Oficiais da Reserva (NPOR) de Pelotas.Métodos: Este estudo longitudinal, avaliou 18 alunos do curso de formação do NPOR, antes e após uma semana de atividade em COI com exercícios físicos intensos. Mensuraram-se a concentração sanguínea de creatina quinase [CK], os indicadores da variabilidade da frequência cardíaca (VFC) e o desempenho dos participantes em testes de aptidão física. O teste de Shapiro-Wilk foi utilizado para avaliar a normalidade dos dados e os momentos foram comparados com teste t de Student para amostras dependentes e as correlações testadas com a prova de Pearson. O nível de confiança das análises foi de 95%.Resultados: A potência de membros superiores e inferiores diminuiu (p<0,05) e o desempenho em força isométrica máxima de preensão da mão esquerda (p=0,03) e resistência abdominal (p<0,00) aumentaram. Houve aumento na VFC (p<0,01), e tamanho do efeito negativo em todos os casos. Entre as variáveis do domínio do tempo, LF teve tamanho do efeito igual a -0,17 e HF -0,28 (p<0,001). Em [CK] não houve alteração. Houve alta correlação entre decréscimo em potência de membros inferiores (salto vertical com contramovimento) e [CK] (p=0,01).Conclusão: Os resultados em VFC sugerem que as atividades realizadas durante o COI promoveram respostas dos ramos simpático e parassimpático de forma significativa, e indicaram boa saúde cardíaca dos participantes devido ao aumento observado entre intervalos RR. Além disso, a diminuição de potência de membros inferiores (no salto vertical com contramovimento) e níveis de [CK] indicou que diferenças nos valores do desempenho, no salto vertical com contramovimento, pode ser, também, utilizado como marcador não invasivo de dano muscular. Effects of Operational Field of Instruction on Physical Fitness, Muscle Damage Markers and Autonomic Control in NPOR Students of Brazilian ArmyIntroduction: The Operational Field of Instruction (OFI) demands high physical and mental effort.Objective: To evaluate the effects of military training activities on indicators of peripheral muscle damage, autonomic control, and physical fitness in students of the Center for Reserve Officers Preparation (CROP) of Pelotas, before and after an OFI and to examine associations with muscle damage. on trainee students.Methods: This longitudinal study evaluated 18 students of the NPOR training course, before and after one week of activity in IOC with intense physical exercises. The blood concentration of creatine kinase [CK], the indicators of heart rate variability (HRV) and the performance of participants in physical fitness tests were measured. The Shapiro-Wilk test was used to evaluate the normality of the data and the moments were compared with Student's t test for dependent samples and the correlations tested with the Pearson test. The confidence level of the analyzes was 95%.Results: The power of the upper and lower limbs decreased (p <0.05) and the performance in maximal isometric strength of the left hand (p = 0.03) and abdominal resistance (p <0.001) increased. There was an increase in HRV (p <0.01), and size of the negative effect in all cases. Among the variables of the time domain, LF had effect size equal to -0.17 and HF -0.28 (p <0.001). In [CK] there was no change. There was a high correlation between decrease in power of lower limbs (vertical jump with countermovement) and [CK] (p = 0.01).Conclusion: The HRV results suggest that the activities performed during the IOC promoted sympathetic and parasympathetic responses in a significant way and indicated good cardiac health of the participants due to the observed increase between RR intervals. In addition, lower limb power (in vertical jump with countermovement) and [CK] levels indicated that differences in vertical jump performance values with countermovement may also be used as a non-invasive marker of muscle damage. The abstract should not exceed 250 words and must summarize the work, giving a clear indication of the conclusions contained therein. It should be structured. The introduction should contextualize the problem. 

Author(s):  
Yang Song ◽  
Xiao Xue Zhao ◽  
Kyle P. Finnie ◽  
Shi Rui Shao

The purposes of this study were to explore the biomechanical variations of vertical jump performance in well-trained young group before and after passive static stretching (PSS) of knee flexors muscles and to further discuss how the passive static stretching (PSS) influences vertical jump performance in order to provide a more effective warm-up routine and theoretical basis for physical education (PE) teachers and coaches. 15 male middle school students without any injury histories on lower limbs in the past 3 months were included in this study. Subjects with markers on the lower limbs performed vertical jump performance before and immediately after PSS of knee flexors muscles, respectively. A Vicon motion capture system was used to collect the kinematic data of lower limb and Kistler force platform simultaneously recorded the ground reaction force (GRF) during vertical jump. Significant differences were also found in the kinematics part. In sagittal plane, the hip, knee and ankle highest flexion angles were greater after PSS when take-off (hip: p< 0.05; knee: p< 0.01; ankle: p< 0.05); while the hip and knee highest flexion angles were greater before PSS when landing (hip: p< 0.01; knee: p< 0.05). These results showed that the increased range of motion (ROM) of hip, knee, and ankle because of PSS could boost the explosive extension of lower limb during take-off, which can potentially improve vertical jump performance, although the peak value of GRF after PSS was lower. Therefore, the PSS applied only on knee flexors muscles may have an acute effect on enhancing the vertical jump performance for well-trained young group and should be added to warm-up exercises in middle school sports class and sports training.


2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Xiquan Weng ◽  
Chaoge Wang ◽  
Yan Meng ◽  
Guoqin Xu

Objective Through testing and analysis the characteristics of body shape,body composition,bone growth and physical fitness,hemoglobin, testosterone of 6-7 years old female preselected tennis players,the study aim was to provide reference bases for the early selection of female tennis players. Methods A total of 75 female preselected tennis players(initial selection by the coaches) aged from 6 to 7 years were came from Hebei, Hubei, Qinghai and Inner Mongolia province, who came to Research Center for Heath related Physical Fitness Evaluation of Guangzhou Sport University for physical fitness test from July 2016 to July 2018. The height, weight, length of upper limbs, length of lower limbs, iliac width, shoulder width, body fat, muscle mass, bone age,bone mass density(BMD), anaerobic power and PWC170, reaction time, vertical jump, grip strength, hemoglobin, testosterone were measured using related instruments and methods, and calculated derived indicators BMI, iliac width/shoulder width. Data were compared with the national standard of physical health of students and/or evaluated by deviation method,and correlation had been analysed among physical parameters. Results 1)The 75 female preselected tennis players’ aged from 6 to 7 years height and weight were 128.10±5.32cm and 25.70±3.87kg,and there are 47 girls height upper medium grade level, 60% of which weight was at a moderate level, their BMI were 15.48±1.50kg/m2,and all in the normal range, iliac width/shoulder width ×100 was 76.52±7.00, 70.7% 0f which was above medium grade level, the upper and lower limbs were 54.28±3.60cm and 71.68±5.26cm, girls’ PBF were 21.03±6.44, muscle weight were 18.94±3.00kg, BMD were 2.04±2.20, and no low bone strength were fund; Anaerobic power of all female preselected tennis players were 135.93±31.65kg.cm, and the values of the PWC170 relative weight were 10.79±2.56kg.m/min.kg, reaction time were 0.628±0.128s, vertical jump were 21.13±4.95cm, the grip of right and left hand were 10.36±2.15kg and 10.06±2.40kg, the physical fitness parameters above in the upper middle class were more girls than the lower middle class; The hemoglobin content was 132.15±8.70g/L, which was above the normal level (110 -160g/L), the serum testosterone concentration was 1.52±1.20umol/L, which was much higher than that of normal girls (0-0.7umol/L). 2) When age was controlled, there was negative correlation between T and PFB, vertical jump and body weight, PWC170 and reaction time(P<0.05), and there was positive correlation between hemoglobin and muscle weight(P<0.05), height, and vertical jump(P<0.01), muscle weight and anaerobic power(P<0.01),anaerobic power and height,weight,BMI,upper and lower limbs(P<0.01, P<0.01, P<0.01, P<0.05, P<0.01),PWC170 and vertical jump,the grip of right and left hand(P<0.01, P<0.05, P<0.05), vertical jump and upper, lower limbs, iliac width/shoulder width(P<0.01, P<0.01, P<0.01). Conclusions 75 female aged from 6 to 7 years old preselected tennis players’ body shape, physical fitness, physiological and biochemical function were superior to peers, and in those parameters,there were more people in upper middle grade than  lower middle grade. There is a certain correlation between body composition, shape and fitness of female preselected tennis players’ aged from 6 to 7 years.


2021 ◽  
Vol 15 (7) ◽  
pp. 2226-2228
Author(s):  
Ahmet Atli ◽  
Ali Furkan Yarar

Background and Study Aim: This single group pre- and post-test study aimed to examine kinematic changes in vertical jump performances before and after fatigue in basketball players. Material and Method: Ten male university student (age 23.28±1.31 years, height 181.17±6.87 cm, body weight 74.53±9.27 kg) basketball players voluntarily participated in the study. Vertical jump test was performed twice, once before fatigue and again after fatigue, and jump measurements were recorded with 2 cameras capable of shooting 240 frames per second. The vertical jumps were measured using a Smart Speed device. The recorded measurements were analyzed using a biomechanical analysis program, and the results were analyzed statistically. Each participant performed 5 resting jumps on the jump mat after warm-up, and the highest height reached was determined as the jump height. Next, the protocol for inducing fatigue was initiated without a period of rest, and the participants were asked to sprint 6x10 m, following which vertical jumps were performed 5 times without any break. The maximum value of each parameter obtained from among the 5 vertical jumps was used for analysis. The protocol for inducing fatigue was followed until the post-fatigue vertical jump parameter values were below 70% of the maximum values recorded before fatigue. Pre- and post-fatigue jump parameter values were statistically analyzed using the paired samples t-test. Results and Conclusion: Statistically significant differences were observed in knee flexion angle measurements before and after fatigue as well as in jump height measurements before and after fatigue (p<0.05). Therefore, it is believed that fatigue may be associated with a risk of knee joint injury in basketball players. Keywords: Kinematic Analysis, Vertical Jump, Performance, Fatigue, Basketball Players


Author(s):  
Aline Bianca Alves Nasci ◽  
Rafael Bueno Orcy ◽  
Léo Dutra Cabistany ◽  
Andressa Formalioni ◽  
Fabrício Boscolo Del Vecchio

High-intensity intermittent exercise (HIIE) elicits large improvements in health and cardiorespiratory fitness (CRF). HIIE can be applied with calisthenics exercises to improve strength and endurance. The acute effects of high-intensity circuit training (HICT) considering different CRF on myological variables are unknown. The aim was measure acute effects of HICT in young women considering different levels of CRF. Twelve women were allocated in two groups, who achieve 41mLO2•kg-1•min-1 or more= High Physical Fitness (HPF, n=5) and who achieve less than 41mLO2•kg-1•min-1= Low Physical Fitness (LPF,n=7). Protocol: 2x4 sets of 20 seconds at maximum intensity (all-out fashion) interspersed with 10 seconds of passive rest (jumping jacks, squat and thrust using 2kg dumbbells, mountain climber, and burpees). Blood samples were collected before, immediately after, 15minutes, 30minutes, one hour and 24 hours after. Heart rate, serum myoglobin, lactate, and creatine kinase (CK) concentration were analyzed. The HR achieved 94.1±3.7% of HRmax for LPF and 104.5±20.3% for HPF, p=0.03. The mean of delta lactate was similar between groups. The highest myoglobin has reached at 1h after the exercise protocol, with 50.0±30.2 ng/mL for LPF and 36.9±9.25 ng/mL for HPF. The delta of total CK before and after the exercise protocol shows that the serum CK level in LPF was significantly higher than HPF group (p=0.042). HICT composed by calisthenic protocol produced elevated and similar effects on HRmax, serum lactate and myoglobin in the woman with HPF and LPF. However, LPF group presented higher muscle damage inferred by serum CK concentrations.


2015 ◽  
Vol 39 (10) ◽  
pp. 764-772 ◽  
Author(s):  
A. Jurado-Lavanant ◽  
J. Alvero-Cruz ◽  
F. Pareja-Blanco ◽  
C. Melero-Romero ◽  
D. Rodríguez-Rosell ◽  
...  

AbstractThe purpose of this study was to compare the effects of land- vs. aquatic based plyometric training programs on the drop jump, repeated jump performance and muscle damage. Sixty-five male students were randomly assigned to one of 3 groups: aquatic plyometric training group (APT), plyometric training group (PT) and control group (CG). Both experimental groups trained twice a week for 10 weeks performing the same number of sets and total jumps. The following variables were measured prior to, halfway through and after the training programs: creatine kinase (CK) concentration, maximal height during a drop jump from the height of 30 (DJ30) and 50 cm (DJ50), and mean height during a repeated vertical jump test (RJ). The training program resulted in a significant increase (P<0.01–0.001) in RJ, DJ30, and DJ50 for PT, whereas neither APT nor CG reached any significant improvement APT showed likely/possibly improvements on DJ30 and DJ50, respectively. Greater intra-group Effect Size in CK was found for PT when compared to APT. In conclusion, although APT seems to be a safe alternative method for reducing the stress produced on the musculoskeletal system by plyometric training, PT produced greater gains on reactive jumps performance than APT.


2021 ◽  
Author(s):  
Erik Tan ◽  
Matthew P. Gonzalez ◽  
Martin Dietze-Hermosa ◽  
SEE Min ◽  
Sandor Dorgo ◽  
...  

The COVID-19 pandemic has caused mandatory lockdowns leading to disruptions in sports training programs. This study aimed to determine the effects of a 16-week COVID-19 lockdown on body composition as well as kinetic and kinematic parameters of the countermovement jump (CMJ) for professional martial artists. Thirteen (n=13) professional martial artists participated in this retrospective cohort study. Subjects were tested on the CMJ at four timepoints: 1) pre-lockdown (pre), 2) immediately post-lockdown (post), 3) two weeks post-lockdown (post+2), and 4) four weeks post-lockdown (post+4). Body composition was measured via bioelectrical impedance and jump data were collected using a force platform sampling at 1,000 Hz. Individual repeated-measures ANOVAs were conducted with pairwise post-hoc analyzes. Differences were observed in vertical jump height (VJH) of 10.33%, peak velocity (PV) of 3.10%, reactive strength index modified (RSImod) of 13.8%, and peak propulsive power (PPP) of 6.00% (p&lt;0.05). There as an increase from post to post+2 of 13.06% in VJ, 4.12% for PV, 14.0% for RSImod, and PPP of 4.66%. There was an increase from post to post+2 of 10.8% in VJH, 3.1% for PV, 14.0% for RSImod, and PPP of 3.0%. Fat mass (FM) and BF% increased from pre to post by 13% and 11%, respectively, and decreased 8% and 11% from post to post+4 respectively (p&lt;0.05). In contrast, there was an decrease in fat-free mass (FFM) from pre to post of 11% and a decrease of 8% from post to post+4. There were moderate associations between FFM and VJH (rmc=0.47), FMM and PPP (rmc=0.47), FFM and PV (rmc=0.47), BF% and PV (rmc=-0.42), and FM and PV (rmc=0.42). While the lockdown resulted in a significant decrease in CMJ performance and increases in BF and FM, subjects’ performance returned to pre-lockdown levels after only 2-4 weeks of post-lockdown training by decreasing BF, FM, and increasing FFM.


Author(s):  
Usman Thattarauthodiyil ◽  
Bhaskar Shenoy

Objective: Aim of this study was to investigate the combined and comparative training outcomes of plyometrics and dynamic stretching of lower limb muscle groups on vertical jump performance in male and female collegiate volleyball players. Materials and Methods: The study was carried out as two training sessions in a week, for eight weeks duration. The total number of participants was 90 male and 90 female collegiate volleyball players aged 18-22 years. All the participants were recreational players and they were playing one hour daily in the evening. They were randomly distributed into three male groups (Group 1, Group 2 & Group 3) and three female groups (Group 4, Group 5 & Group 6) with 30 participants in each group. All the participants underwent Sargent vertical jump performance test before starting the training session it was repeated in every two weeks of training program. Results: Plyometrics and plyometrics with dynamic stretching led to significant improvements in vertical jump height (VJH), and this improvement was progressed after every two weeks of training. However, the control groups did not display any improvement. The effect of training was significantly higher in male and female groups who have performed plyometrics with lower limbs dynamic stretching as compared with the groups that performed only plyometric exercises (p<0.05). Compared to females, male participants had a better improvement of VJH in both training groups (p<0.05). Conclusion: It can be concluded that two sessions of plyometric exercise training per week for eight weeks can improve the ability of VJH in male and female collegiate volleyball players. However, combined training of lower body plyometrics and lower limbs dynamic stretching had better results in terms of vertical jump performance.


2009 ◽  
Vol 24 (1) ◽  
pp. 26-29
Author(s):  
Manuela Angioi ◽  
Giorgos S Metsios ◽  
Yiannis Koutedakis ◽  
Emily Twitchett ◽  
Matthew Wyon

Limited data are available on whether different physical fitness levels are associated with injury severity in contemporary dancers. The aim of this study was to investigate this association in female dancers. Five professional contemporary dancers and 11 dance students in pre-professional training volunteered (n = 16). All participants underwent selected fitness assessments (anthropometry, flexibility, muscular power and endurance, aerobic capacity) and completed a seven-item recall questionnaire about their last 12-month injury history. Pearson's coefficients detected significant negative correlations between the total number of days off due to injuries and standing vertical jump (r = –0.66; p = 0.014). Backward regression analysis also revealed that days off due to injuries was best predicted from standing vertical jump performance (p = 0.014). Results suggest that a reduced level of lower body muscular power is associated with increased severity of injuries in female contemporary dancers. More research using appropriate methodological designs, such as sample size calculations and randomization and the use of contemporary dance movements only, is needed to investigate the effects of physical fitness levels on injury severity in contemporary dance.


2014 ◽  
Vol 30 (5) ◽  
pp. 637-642 ◽  
Author(s):  
Sean J. Maloney ◽  
Anthony N. Turner ◽  
Stuart Miller

It has previously been shown that a loaded warm-up may improve power performances. We examined the acute effects of loaded dynamic warm-up on change of direction speed (CODS), which had not been previously investigated. Eight elite badminton players participated in three sessions during which they performed vertical countermovement jump and CODS tests before and after undertaking the dynamic warm-up. The three warm-up conditions involved wearing a weighted vest (a) equivalent to 5% body mass, (b) equivalent to 10% body mass, and (c) a control where a weighted vest was not worn. Vertical jump and CODS performances were then tested at 15 seconds and 2, 4, and 6 minutes post warm-up. Vertical jump and CODS significantly improved following all warm-up conditions (P< .05). Post warm-up vertical jump performance was not different between conditions (P= .430). Post warm-up CODS was significantly faster following the 5% (P= .02) and 10% (P< .001) loaded conditions compared with the control condition. In addition, peak CODS test performances, independent of recovery time, were faster than the control condition following the 10% loaded condition (P= .012). In conclusion, the current study demonstrates that a loaded warm-up augmented CODS, but not vertical jump performance, in elite badminton players.


2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Antônio Gomes de Resende-Neto ◽  
José Carlos Aragão-Santos ◽  
Bruna Caroline Oliveira-Andrade ◽  
Alan Bruno Silva Vasconcelos ◽  
Clodoaldo Antônio De Sá ◽  
...  

Aim. To analyze the efficacy of functional training (FT) and traditional training (TT) in body composition and determinants of physical fitness in older women. Methods. This is a randomized clinical trial in which participants performed two 12-week periods of different training methods, separated by eight weeks of washout. Forty-eight physically active older women (≥60 years of age) completed the intervention in three groups: (i) program that started with FT and ended with TT (FT ⟶ TT: n = 19), (ii) program that started with TT and ended with FT (TT ⟶ FT: n = 13), and (iii) stretching group (SG: n = 16). Before and after the interventions, the body composition was evaluated by bioimpedance, the physical fitness by battery of the Senior Fitness Test, and the quality of movement by Functional Movement Screen®. Results. Compared with SG, TT ⟶ FT and FT ⟶ TT promoted significant improvements in balance/agility (13.60 and 13.06%, respectively) and upper limb strength (24.91 and 16.18%). Only FT showed a statistically significant improvement in the strength of the lower limbs, cardiorespiratory capacity, and movement patterns when compared with SG considering the adaptations of methods separately. Conclusion. The programs used are equally effective in increasing physical fitness for daily activities in physically active older women, and therefore, they may be complementary to combat some of the deleterious effects of senescence.


Sign in / Sign up

Export Citation Format

Share Document