scholarly journals Profile of aerobic fitness and muscle power of athletes on the Brazilian National Paralympic Five-a-side Football Team

2019 ◽  
Vol 33 (3) ◽  
pp. 345-352
Author(s):  
Eduardo Da Silva Alves ◽  
Valdir De Aquino Lemos ◽  
João Paulo Pereira Rosa ◽  
Andressa Da Silva ◽  
Junior Gavea ◽  
...  
Keyword(s):  
Aerobic Fitness ◽  
Muscle Power ◽  
Ventilatory Threshold ◽  
Peak Torque ◽  
Peak Oxygen Uptake ◽  
Maximum Speed ◽  
Football Team ◽  
Torque Values ◽  
The Right ◽  
Physical Capacities

We aimed to profile the aerobic fitness and muscle power of five-a-side football athletes on the Brazilian National Paralympic Team. The sample consisted of 12 male Paralympic athletes on the Brazilian National five-a-side football team, including 3 sighted goalkeepers and 9 blind (B1 category) outfield players. The results were: peak oxygen uptake (VO2 peak), 51.8 ± 5.8 ml/kg/min; maximum speed, 17.1 ± 1.4 km/h and VO2 ventilatory threshold (VT), 40.2 ± 6.5 ml/kg/min The peak torque values (Nm) of the right and left legs were 241 ± 48 and 234 ± 45 for 60° extension, 127 ± 17 and 123 ± 16 for 60° flexion, 170 ± 29 and 162 ± 28 for 180° extension, 113 ± 13 and 109 ± 13 for 180° flexion, 130 ± 20 and 129 ± 23 for 300° extension, and 118 ± 17 and 115 ± 18 for 300° flexion, respectively. The five-a-side football players on the Brazilian National Paralympics Team exhibited physiologically normal responses to physical training related to the observed physical capacities as shown by the aerobic fitness and muscle power results observed. These results suggest that blind individuals can improve their physical capacity regardless of their visual impairment.

scholarly journals Profile of aerobic fitness and muscle power of athletes on the Brazilian National Paralympic Five-a-side Football Team

2019 ◽  
Vol 33 (3) ◽  
pp. 345-352
Author(s):  
Eduardo da Silva Alves ◽  
Valdir de Aquino Lemos ◽  
João Paulo Pereira Rosa ◽  
Andressa da Silva ◽  
Junior Gavea ◽  
...  
Keyword(s):  
Aerobic Fitness ◽  
Muscle Power ◽  
Ventilatory Threshold ◽  
Peak Torque ◽  
Peak Oxygen Uptake ◽  
Maximum Speed ◽  
Football Team ◽  
Torque Values ◽  
The Right ◽  
Physical Capacities

We aimed to profile the aerobic fitness and muscle power of five-a-side football athletes on the Brazilian National Paralympic Team. The sample consisted of 12 male Paralympic athletes on the Brazilian National five-a-side football team, including 3 sighted goalkeepers and 9 blind (B1 category) outfield players. The results were: peak oxygen uptake (VO2 peak), 51.8 ± 5.8 ml/kg/min; maximum speed, 17.1 ± 1.4 km/h and VO2 ventilatory threshold (VT), 40.2 ± 6.5 ml/kg/min The peak torque values (Nm) of the right and left legs were 241 ± 48 and 234 ± 45 for 60° extension, 127 ± 17 and 123 ± 16 for 60° flexion, 170 ± 29 and 162 ± 28 for 180° extension, 113 ± 13 and 109 ± 13 for 180° flexion, 130 ± 20 and 129 ± 23 for 300° extension, and 118 ± 17 and 115 ± 18 for 300° flexion, respectively. The five-a-side football players on the Brazilian National Paralympics Team exhibited physiologically normal responses to physical training related to the observed physical capacities as shown by the aerobic fitness and muscle power results observed. These results suggest that blind individuals can improve their physical capacity regardless of their visual impairment.

Instrument-assisted Soft Tissue Mobilization Improves Physical Performance of Young Male Soccer Players

2018 ◽  
Vol 39 (12) ◽  
pp. 936-943 ◽  
Author(s):  
Jonggun Kim ◽  
JongEun Yim
Keyword(s):  
Body Weight ◽  
Soft Tissue ◽  
Muscle Fatigue ◽  
Muscle Power ◽  
Plantar Flexion ◽  
Peak Torque ◽  
Soccer Players ◽  
Angular Velocities ◽  
The Right ◽  
Soft Tissue Mobilization

AbstractThis study aimed to examine the effects of a rehabilitation exercise combined with instrument-assisted soft tissue mobilization on the isokinetic power, muscle fatigue, and fitness of soccer players. An interventional study design was used to assess 40 subjects aged 15–17 years. Twenty participants each in instrument-assisted soft tissue mobilization and control groups completed several tests to determine player development. The results showed significant differences between the two groups with respect to the isokinetic power of the ankle (i. e., dorsiflexion, peak torque body weight at the right- and left-foot angular velocities of 30°/s and 120°/s; plantar flexion, peak torque body weight at the right- and left-foot angular velocities of 30°/s and 120°/s) and knee (extension, right peak-torque body weight at 60°/s and 180°/s and left peak-torque body weight at 60°/s; flexion, right and left peak-torque body weight at 60°/s and 180°/s), muscle fatigue, and physical fitness (P<0.05). Instrument-assisted soft tissue mobilization in soccer players suggests that the characteristics of athletic performance may be improved by decrease in fatigue and increase in fitness and muscle power. Therefore, we suggest instrument-assisted soft tissue mobilization for soccer players to increase their performance.

scholarly journals Strength of the Shoulder Rotators in Second-League Volleyball Players

2015 ◽  
Vol 22 (4) ◽  
pp. 215-218
Author(s):  
Aneta Popieluch ◽  
Michał Staniszewski ◽  
Michał Wychowański
Keyword(s):  
Maximal Voluntary Contraction ◽  
Peak Torque ◽  
Voluntary Contraction ◽  
Statistical Testing ◽  
Control Group ◽  
Horizontal Position ◽  
Left Limb ◽  
Volleyball Players ◽  
Torque Values ◽  
The Right

AbstractIntroduction.The main aim of the study was to assess the strength of the shoulder rotator muscles of a group of second-league volleyball players. These muscles are assumed to have a crucial impact on attack effectiveness in volleyball. Strength was assessed based on peak torque values obtained for the rotator muscles measured using the maximal voluntary contraction (MVC) method. Torque was measured in both limbs and the differences between the two limbs were examined. The torque values obtained for the volleyball players were also compared against those measured in a group of students who had never trained any sports.Material and methods.The study involved 20 students (mean age = 20 ± 1 years) who played in the second league when the study was conducted. Their results were compared with those of a control group consisting of 30 students (mean age = 20 ± 1 years) who had not trained any sports. Peak torque of the shoulder rotator muscles was measured during external and internal rotation of the shoulder in isometric conditions. The assessment was performed on a special measuring station with the forearm in a vertical and horizontal position. The following basic statistics were calculated for the torque values obtained in the measurement: the mean, standard deviation, minimum value, and maximum value. The data were then subjected to statistical testing.Results.Compared to the students, the volleyball players had higher torque values of the internal and external rotators of the right and left shoulders, in both positions of the forearm. When the results obtained for the right and left limbs were compared for the group of volleyball players, it was found that the torque values for the right limb, which was the dominant limb, were significantly higher than those recorded for the left limb. The study also showed that the position of the forearm had an impact on torque values: when the forearm was in a horizontal position, higher mean values were obtained for the external rotators of the right (p < 0.05) and left (p < 0.01) limbs, and when it was in a vertical one, the internal rotators were stronger compared to the external rotators.Conclusions.The shoulder rotator muscles of the volleyball players were found to be considerably stronger than those of the students, and the rotators of the dominant limb were significantly stronger than those of the non-dominant limb in the group of volleyball players. The position of the forearm had a considerable impact on the strength of the internal and external rotator muscles. The maximal voluntary contraction method used in the study can be helpful in measuring the strength of the shoulder rotator muscles in any phase of the training process.

Maturity Status Does Not Exert Effects on Aerobic Fitness in Soccer Players After Appropriate Normalization for Body Size

2016 ◽  
Vol 28 (3) ◽  
pp. 456-465 ◽  
Author(s):  
Giovani Dos Santos Cunha ◽  
Marco Aurélio Vaz ◽  
Jeam Marcel Geremia ◽  
Gabriela T. Leites ◽  
Rafael Reimann Baptista ◽  
...  
Keyword(s):  
Body Size ◽  
Aerobic Fitness ◽  
Ventilatory Threshold ◽  
Peak Oxygen Uptake ◽  
Muscle Volume ◽  
Soccer Players ◽  
Chronological Age ◽  
Maximal Exercise Test ◽  
Positive Effect ◽  
Size Descriptor

The present study investigated the effects of pubertal status on peak oxygen uptake (VO2peak), respiratory compensation point (RCP), and ventilatory threshold (VT) in young soccer players using different body size descriptors. Seventy-nine soccer players (14 prepubescent, 38 pubescent and 27 postpubescent) participated in this study. A maximal exercise test was performed to determine the VO2peak, RCP, and VT. Ultrasonography was used to measure lower limb muscle volume (LLMV). LLMV (mL-b) was rated as the most effective body size descriptor to normalize VO2peak (mLO2•mL-0.43•min-1), RCP (mLO2•mL-0.48•min-1), and VT (mLO2•mL-0.40•min-1). The values of VO2peak, RCP, and VT relative to allometric exponents derived by LLMV were similar among groups (p > .05; 0.025 < η2 < 0.059) when the effect of chronological age was controlled. Allometric VO2peak, RCP, and VT values were: 100.1 ± 7.9, 107.5 ± 9.6, and 108.0 ± 10.3 mLO2.mL-0.43•min-1; 51.8 ± 5.3, 54.8 ± 4.7, and 57.3 ± 5.8 mLO2•mL-0.48•min-1; and 75.7 ± 7.1, 79.4 ± 7.0, and 80.9 ± 8.3 mLO2•mL-0.40•min-1 for prepubertal, pubertal, and postpubertal groups, respectively. Maturity status showed no positive effect on VO2peak, RCP, and VT when the data were properly normalized by LLMV in young soccer players. Allometric normalization using muscle volume as a body size descriptor should be used to compare aerobic fitness between soccer players heterogeneous in chronological age, maturity status, and body size.

Screwdriver torque strength and physiological cost of muscles dependent on hand preference and direction of rotation

1998 ◽  
Vol 1 (1) ◽  
pp. 13-22
Author(s):  
Helmut Strasser ◽  
Baoquiu Wang
Keyword(s):  
Hand Preference ◽  
Dominant Hand ◽  
Muscle Forces ◽  
Maximum Torque ◽  
Physiological Cost ◽  
Nondominant Hand ◽  
Physiological Differences ◽  
Torque Values ◽  
The Right

The focus of this research was to investigate how maximum torque and muscle forces were affected by pronation and supination, i.e., inward and outward rotation of the forearm in a series of screwdriver tests with 6 varied handles. Consecutively, maximum torque for pronation and supination was determined, submaximum isometric levels of torque were demanded, and, finally, an equal dynamic screwing work for all subjects was simulated. Physiological cost of performance was simultaneously measured by registrations of electromyographic activities (EA) from 4 muscles, which were expected to be involved intensively in screwing tasks. Significant and essential differences between maximum torque values produced by pronation and supination of the right and the left arm of the mainly right-handed subjects were found. For clockwise work, as it is necessary e.g., for driving in screws, inward rotations (pronations) of the nondominant hand are at least as strong as outward rotations of the dominant hand. Differences of about 8% favour of pronations were found. Yet, for counter clockwise work involved e.g., in removing a tightened screw, inward rotations of the dominant hand yielded a much more stronger torque strength than outward rotations of the nondominant hand. Differences of more than 50% right-handed subjects were measured. Also, EA values of the 4 muscles monitored on the right arm differed significantly. Systematically operational and physiological differences due to the varied screwdriver grips, as results of investigations which were not the main objective of the study, corresponded well with the findings of prior studies.

scholarly journals Test-Retest Reliability of Isokinetic Knee Strength Measurements in Type 2 Diabetes Mellitus Patients

2021 ◽  
Vol 13 (3) ◽  
pp. 1343
Author(s):  
José Carmelo Adsuar ◽  
Jose Parraca ◽  
Armando Raimundo ◽  
Miguel Angel Garcia-Gordillo ◽  
Patricia Polero ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Type 2 Diabetes ◽  
Type 2 Diabetes Mellitus ◽  
Peak Torque ◽  
Total Sample ◽  
Good For ◽  
The Right ◽  
Test Retest Reliability ◽  
Standard Error Of Measurement

Background: Reliability studies are used to verify the evaluation accuracy of a given device. Strength is an important factor for the development of daily activities and its correct management is fundamental. The objective of this study was to examine the reliability of a concentric strength test in people with type 2 diabetes mellitus (T2DM). Methods: Twenty-seven individuals with T2DM performed three repetitions of extension-flexion in concentric-concentric action at 60°/s, for both legs, using an isokinetic dynamometer. For the reliability analysis, we performed an intra-session test retest. Results: The total sample and men sub-group intra-class correlation coefficient (ICC) values were excellent for peak torque and work. In the women sub-group, ICC values were excellent for extensors in both peak torque and work; however, concerning flexor, the ICC values were good for peak torque while, for work, they were good for the right leg and moderate for the left leg. Standard error of measurement (SEM) percentage oscillated from 3.85% to 6.80%, with the smallest real difference (SRD) percentage being from 10.66% to 18.86% for peak torque. Furthermore, the SEM (%) was around 5.5% and SRD (%) was around 15% for work. Conclusions: The isokinetic dynamometry had “good” to “excellent” relative reliability for peak torque (0.862–0.983) and work (0.744–0.982) of extension-flexion in concentric-concentric action at 60°/s. In addition, our study showed that, in general, an SRD < 20% could indicate a true change in strength regarding this protocol in T2DM.

Validity of Isokinetic and Isometric Testing modalities for Assessing Short-term Resistance Exercise Strength Gains

1992 ◽  
Vol 1 (4) ◽  
pp. 275-283 ◽  
Author(s):  
Andrew C. Fry ◽  
Dawn R. Powell ◽  
William J. Kraemer
Keyword(s):  
Resistance Exercise ◽  
Human Performance ◽  
Peak Torque ◽  
Quadriceps Strength ◽  
Short Term ◽  
Isokinetic Testing ◽  
Leg Extension ◽  
Leg Flexion ◽  
Isokinetic Torque ◽  
Torque Values

Although it is generally accepted that human performance must be assessed in a manner specific to the training, previous studies have violated this principle. In order to determine the validity of evaluating short-term resistance training programs with isometric and isokinetic measures, 23 recreationally active males participated in an 8-week training program. Subjects were randomly divided into barbell squat, hip sled, leg extension, and control groups. Pre- and posttesting of quadriceps strength was performed with a Cybex isokinetic dynamometer. Six angle-specific torques (N.m) were determined at 0 rad-s-1 and 1.05 rad-s-1. Ten RM training loads increased significantly for all groups that trained. Isometric torque values differed significantly from isokinetic torque values at 30, 60, 75, and 90° of leg flexion for all groups. No significant torque increases from pre- to posttest were observed for any group at any limb angle for either isometric or isokinetic testing, or for isokinetic peak torque. This indicates that strength increases during short-term dynamic external resistance exercise are not adequately assessed with either isometric or isokinetic evaluations.

scholarly journals Isokinetic strength of shoulder internal and external rotators in cricket bowlers

2002 ◽  
Vol 58 (2) ◽  
Author(s):  
X.M. Mabasa ◽  
A. Stewart ◽  
C. Fleishman
Keyword(s):  
External Rotation ◽  
Peak Torque ◽  
Isokinetic Strength ◽  
Neutral Position ◽  
Joint System ◽  
Rotational Strength ◽  
Significant Difference ◽  
Position Data ◽  
Torque Values ◽  
Rotation Strength

The strength of the shoulder internal and external rotators incricket bowlers, may not be sufficient to cope with the demands of bowling.As very little research has been done on cricketers, this study was done to establish the isokinetic strength profile of the shoulder internal andexternal rotators in cricket bowlers.Isokinetic, shoulder rotational strength was evaluated in thirty malecricket volunteers with a mean age of 23.9 years and mean body weight of 70.3 kgs. The Cybex 340 dynamometer multi joint system was used to collect data on shoulder rotation strength in a standing neutral position. Data were collected at four different speeds (60,90,180 and 300deg/sec) and were computed for peak torque values for internal and external ratios for both dominant and non dominant shoulders.The results showed no statistically significant difference in the mean shoulder rotational torque between the bowlingand non-bowling shoulders for external rotation (p>0.05), and indicated statistically significant differences in themean shoulder rotational torque between the bowling and non-bowling shoulders for internal rotation (p<0.05). Therewas a significant decrease in isokinetic peak torque production for the external/internal rotator muscles as the speedof contraction increased (p<0.05). The peak torque ratio for the external/internal rotator muscles of the bowling armwere significantly less than of the non-bowling arm (p<0.05). These findings suggest that the strength ratios of thebowling arm need to be considered when managing young cricketers and their injuries.

scholarly journals Muscle strength and inflammatory response to the training load in rowers

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10355
Author(s):  
Tomasz Podgórski ◽  
Alicja Nowak ◽  
Katarzyna Domaszewska ◽  
Jacek Mączyński ◽  
Magdalena Jabłońska ◽  
...  
Keyword(s):  
Muscle Metabolism ◽  
Creatine Kinase Activity ◽  
Lower Limbs ◽  
Total Testosterone ◽  
Blood Biochemical ◽  
Global Force ◽  
Significant Difference ◽  
Muscle Groups ◽  
Torque Values ◽  
The Right

Background Regular exercise leads to changes in muscle metabolism. The consequence of this is the adaptation to higher training loads.The aim of this study was to evaluate biomechanical and biochemical parameters describing the functions of skeletal muscles in periods when changes in training forms were introduced. Methods Seventeen male sweep-oar rowers, members of the Polish national rowing team, participated. The study was carried out at the beginning and at the end of the preparatory period. In the first and second examination measurements of torques of selected muscle groups and blood biochemical analysis were performed. Results There was observed a statistically significant decrease in the relative global force of the right lower limb between both terms of examination. A statistically significant increase in maximum torque was found for torso flexors. In the case of muscles responsible for torso rotation, a statistically significant decrease in the torque values of right torso rotators was observed. A significant difference was found with respect to creatine kinase activity, total testosterone concentration, total testosterone to cortisol ratio and total phenolics concentration (p < 0.05). Conclusion The study shows that the rowers’ training should be more focused on building the strength of lower limbs to prevent the overload of lumbar spine and that the amount of force developed may be significantly affected by the antioxidant potential of rowers.

scholarly journals ISOKINETIC PROFILES AND REFERENCE VALUES OF PROFESSIONAL SOCCER PLAYERS

2021 ◽  
Vol 27 (6) ◽  
pp. 610-615
Author(s):  
Guillermo Charneco Salguero ◽  
Francisco García-Muro San José ◽  
Arturo Pérez Gosalvez ◽  
Jose Miguel Cárdenas Rebollo ◽  
Isabel Brígido Fernández ◽  
...  
Keyword(s):  
Reference Values ◽  
Health Professionals ◽  
High Speed ◽  
Peak Torque ◽  
Soccer Players ◽  
Level Of Evidence ◽  
Warm Up ◽  
Professional Soccer ◽  
Average Work ◽  
Torque Values

ABSTRACT Introduction: Isokinetics is a tool commonly used in professional soccer. There is ongoing debate among researchers as to the isokinetic reference values a player should have. Objectives: To determine the absolute peak torque (PT) and average work of professional soccer players in relation to their positions on the field, and to establish the reference values for these variables. Methods: Purposeful sampling was used to select 289 professional soccer players. The sample included 32 goalkeepers, 100 defenders, 98 midfielders, and 59 strikers. The participants were measured preseason. The players were asked to perform a 10-minute warm-up on an exercise bike, and then to perform 5 repetitions at low speed, 10 at medium speed, and 25 at high speed, with 30 to 40-s of rest between each set of repetitions. The contraction method was concentric-concentric in a dynamometer Isomed 2000. Results: The average age, weight, and height of the players was 21.9 years, 74.3 kilograms, and 1.8 meters, respectively. The goalkeepers presented higher PT at the 3 measured speeds, and the higher average work at 180°/s and 240°/s in relation to defenders and midfielders. The strikers presented higher average work at 240°/s in relation to midfielders, and higher PT in relation to the defenders and midfielders. Absolute values were shown and reference values were established. Conclusions: The goalkeepers and strikers were the players that showed the greatest differences in their favor in relation to the other positions. The peak torque values and average work were described in relation to the player's position on the field. This study resulted in the creation of a tool for health professionals working with professional soccer players, providing reference values for these players in relation to their position on the field that can be used as benchmarks, by health professionals, to optimize soccer players’ performance. Level of evidence II, Prospective comparative study.

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