Jumping Ability Research Articles

Effect of Supplementary Physical Training on Vertical Jump Height in Professional Ballet Dancers.

Dancers require many specific dance skills of a ballistic nature. The design of supplementary training to improve the strength of the lower limbs and jump height is a relevant area of research. The purpose of this study was (1)to compare the effect of plyometric training versus combined training on countermovement jump (CMJ), squat jump (SJ), and sauté in first position (sauté) height and (2)to observe whether changes in CMJ and SJ were associated with changes in sauté in female and male dancers. Eighty-one classical professional ballet dancers (41 women and 40 men, age = 22.9 [3.7]y, body mass = 59.7 [8.6]kg, height = 167.4 [7.3]cm) were divided into a control group and 2 experimental groups: plyometric training and combined training. All groups followed their common routine of training regarding classes and rehearsal practice, whereas the experimental groups added 2 sessions (1 h per session) for 9 weeks of supplementary training. Significant increases (medium to large effect size) in CMJ, SJ, and sauté height were found in the pretest versus posttest comparisons for both experimental groups. Significant, very large correlations were found between the magnitude of improvement in sauté and the magnitude of improvement in CMJ and SJ. Plyometric and combined training programs are effective ways to improve jumping ability in professional dancers. The improvement in CMJ and SJ has a good transference on sauté `performance. These findings support the use of traditional training methods to improve jump height in specific and nonspecific ballet jumping ability.

Launching of a Cyborg Locust via Co-Contraction Control of Hindleg Muscles

Jumping is beneficial for microrobots because they have to face obstacles larger than their height frequently. However, compacting a jumping mechanism into the small body of a microrobot is exceptionally challenging. Instead of assembling a bio-inspired microrobot, the insect itself can be transformed into a jumping robot. Herein, we demonstrated the first-ever biohybrid jumping robot that retained the natural jumping ability of a locust. The fast kicking of the locust's hindleg was mainly induced by two muscles, flexor muscle, and extensor muscle. The elaborate structure and accurate collaboration of the muscles are critical for leg kicking, contributing to the co-contraction process. In this article, we investigated the sequences of muscular activities and demonstrated the co-contraction control exogenously. The kicking control of the hindleg relies on the accurately overlapped stimulation and the independently modulated waveform. With the help of a tiny wireless stimulator, the cyborg locust was remotely controlled to jump an average of 10.4 cm high and 42.6 cm far. Moreover, the cyborg locust retained its internal body righting mechanism, which means the robot can quickly recover its posture for consecutive jumping. This work is a foundational step towards a fully controllable biohybrid jumping robot.

Increasing Students' Far Jump Ability Using Media

This study aims to determine the increase in the long jump ability of students using media. This research uses the CAR approach (Classroom Action Research). This research was conducted to find information about the implementation of learning variations delivered by classroom action research. Following this type of research, namely classroom action research, this research has staged in the form of cycles. The design of each cycle consists of four stages, namely planning, implementation, observation, and reflection. From the results of the study, it was found that in the learning outcomes in cycle 1 9 students had not achieved the completeness score because they got scores below 75 and 13 other students were declared complete after getting a score above 75, as for the completeness score in the lessons at school. is 75. In the pre-cycle, the average value of student learning outcomes is 75%. Then from the learning outcomes in cycle 2, 2 students had not achieved the completeness score because they got a score below 75 and 35 other students were declared complete after getting a score above 75, while the completeness score in the lessons at school was 75. So it can be concluded that there is an increase in the long jump ability of students using media with the evidence that students are not completely reduced.

Effects of small-sided games and running-based high-intensity interval training on body composition and physical fitness in under-19 female soccer players

BackgroundThe aim of this study was to compare the effects of small-sided games (SSGs) and running-based high-intensity interval training (HIIT) on the body composition and physical fitness of youth female soccer players.MethodsThis study followed a randomized parallel study design. Twenty-four female soccer players (age: 18.63 ± 2.36 years) were randomly allocated to two training groups (SSG, n = 12; and HIIT, n = 12). The training intervention had a duration of eight weeks, consisting of three training sessions per week. Players were assessed twice (pre- and post-intervention) for anthropometrics, vertical (countermovement jumps, CMJ; and drop jumps, DJ) and horizontal jumping (single, triple and crossover hop), sprinting (10- and 30-m), change-of-direction (COD), COD deficit and final velocity at 30–15 Intermittent Fitness Test (VIFT). A covariance analysis (ANCOVA) was used to determine differences between the groups in the effect on post-intervention by controlling for covariates (pre-intervention). The within-group analysis (time) was performed using a paired t-test, while the between-group analysis per assessment moment was performed using an independent t-test.ResultsThe between-group analysis with ANCOVA revealed that there are no significant differences between the SSG and HIIT groups in the post-intervention for any outcome (p > 0.05). The within-group analysis revealed significant improvements in both the SSG and HIIT groups in CMJ (p < 0.05), single, triple and crossover hops (p < 0.05), RSI DJ 30-cm and RSI DJ 40-cm (p < 0.05), VIFT (p < 0.05) and COD (p < 0.05).ConclusionsSSG and HIIT are both effective for improving vertical and horizontal jumping ability, change-of-direction, and aerobic capacity status measured at a progressive and intermittent multistage test in youth soccer players.

Profile and Differences in Anthropometric Data and Jumping Ability Performance between Elite and Amateur U16 Volleyball Players

Research purpose. The purpose of this study is to verify if there are significant differences between different anthropometric and jumping ability variables by testing two groups of elite and amateur volleyball players (under 16) after having submitted the two groups to the same training protocol performed 4 times a week for 4 months.&#x0D; Materials and methods. The study was carried out on 24 volleyball players divided into two groups. The following anthropometric and jumping ability parameters were assessed in all subjects: height, weight, body mass index, height with a stretched arm and height with two extended arms. The jumping ability measurement was carried out with the Vertec jump test.&#x0D; Results. The results of the anthropometric parameters showed significant differences between the two groups on all the variables considered: in height (p = 0.00), in weight (p = 0.00), in Vertec attack with a stretched arm, AH1 (p = 0.00) and in Vertec wall with two outstretched arms, AH2 (p = 0.01). The results of the jumping ability parameters showed significant differences between the two groups (elite and amateur): in Vertec Wall, VW (p = 0.00) and Vertec Attack with run-up, VA (p = 0.00); and a high correlation was shown for both the groups.&#x0D; Conclusions. Above all, in high-level youth volleyball, the anthropometric and jumping ability profile is directly linked to the evaluation; training and continuous monitoring of physical qualities and jumping ability become an important aspect for the control of performance and the possibility of selecting talented players.

Research on AUV Energy Saving 3D Path Planning with Mobility Constraints

This paper aims to focus on the path planning problem of AUV in the marine environment. As well as considering the path length and safe obstacle avoidance, ocean currents should not be ignored as the main factor affecting the navigation energy consumption of AUV. At the same time, the path should satisfy the mobility constraint of AUV; otherwise, the path is inaccessible to AUV. For the above problems, this paper presents a path planning algorithm based on an improved particle swarm (EPA-PSO); the fitness function is designed based on path length, energy consumption, and mobility constraints. The updated law of particle velocity and the initialization law of particles are improved, and the possible optimal solutions are stored in the feasible solution set; finally, the optimal solutions are obtained by comparison. The local jumping ability is given to the particle swarm so that the particles can jump out of the local optimal solution. The path planning simulation experiment is compared with the traditional PSO algorithm. The results show that the EPA-PSO algorithm proposed in this paper can be used in the AUV three-dimensional path planning process. It can effectively save energy and make the navigation path of AUV satisfy the requirements of maneuverability. The field experiment was completed in Shanghai, China, and the experiment proved that it was feasible to obtain a path satisfying the maneuverability constraints with optimal energy consumption for the problems studied in this paper.

Inter limb symmetry of selected foot anthropometric measures and its relationship to vertical jumping ability

Aim: The study was intended to examine the symmetry between right and left foot; and to analyse the degree of relationship of selected foot anthropometric measurements on different vertical jumping performance. Methods: The criterion variables right foot length, left foot length, right foot breadth, left foot breadth, arch of right foot, arch of left foot, right foot index, left foot index, and foot symmetry index, vertical jump height, counter movement jump height, and squat jump height chosen for the study were measured using the sliding caliper, protractor, Microgate OptoJump, and Microgate Gyko. Descriptive analysis is performed to compute the percentage of inter limb variation, ‘t’ ratio for the existence of significant difference, and Pearson product moment correlation coefficient to determine association among criterion variables. Results: It is found that foot length, foot breadth, and arch of the foot are asymmetrical between limbs, and furthermore shows very little to no considerable association between foot anthropometry and vertical jumping ability. Conclusion: Thus, we conclude that the individuals with broader foot breadth, greater foot index and corresponding foot symmetry impacts largely than foot length and arch of the foot.

Effects of cadmium exposure on thyroid gland and endochondral ossification in Rana zhenhaiensis

Discovery of elevated concentrations of cadmium in the natural environment has increased awareness because of their potential threats. Amphibians are negatively affected due to their moderate sensitivity to cadmium. Here, we conduct acute and subchronic toxicity tests to examine whether, and to what extent, cadmium exposure disturbs metamorphosis, growth, and kinetic ability of Rana zhenhaiensis. We set different concentration treatment groups for the subchronic toxicity test (0, 10, 40, 160 μg Cd L−1). Our findings demonstrate that cadmium exposure reduces growth parameters and the cumulative metamorphosis percent of R. zhenhaiensis. Decreases in follicular size and follicular epithelial cell thickness of thyroid gland are found in the treatment group. Further, subchronic exposure to cadmium decreases ossification ratio of hindlimbs in all treatment. Also, adverse effects of cadmium exposure on aquatic tadpoles can result in the reduced physical parameters and weak jumping ability in adult frogs. In this sense, our study suggests that cadmium adversely influences body condition and metamorphosis of R. zhenhaiensis, damages thyroid gland and impairs endochondral ossification. Meanwhile, we speculated that cadmium-damaged thyroid hormones inhibit skeletal development, resulting in the poor jumping ability, which probably leads to reduced survival of R. zhenhaiensis.

Reliability, Validity, and Sensitivity of a Specific Agility Test and Its Relationship With Physical Fitness in Karate Athletes.

The aim of this study was to investigate the validity and reliability of a developed specific karate agility test (SKAT) and to examine its relationship with physical fitness. A total of 36 karateka voluntarily participated in this study. During two separate sessions, international and national ranked athletes completed the SKAT by performing three changes of direction (CoD): two in a preplanned manner and one in response to a stimulus that was provided by a live tester (Light tester). Assessment of CoD, horizontal jumping ability, 5 and 10 m sprint time, and dynamic balance were also applied during these two occasions. To evaluate SKAT’s construct validity, two groups were recruited based on their karate results: High- vs. low-ranked athletes. Reliability, validity, and sensitivity of the SKAT were examined from the intraclass correlation coefficient (ICC), standard error of measurement (SEM), smallest worthwhile change (SWC), and receiving operator characteristic analysis. Regarding relative and absolute reliability, the ICC of SKAT was excellent at >0.95 and the SEM was <5%. According to the sensitivity analysis, the power to detect small performance changes can be rated as “good” in karate athletes (SWC > SEM). The SKAT showed a moderate relationship with the CoD, jumping, sprint, and dynamic balance tests. High-ranked athletes were better than their low-ranked counterparts on SKAT (Cohen’s d = 2.00). The area under the receiving operator characteristic curve was 0.76. To sum up, the SKAT is a reliable and valid tool to assess the agility performance of karatekas and can be used by conditioning trainers to detect “true” performance changes.

Peningkatan Kemampuan Melompat Anak Melalui Permainan Lompat Tali pada Anak Kelompok B di TK Pertiwi 3 Karanganyar

Jumping is a locomotor movement that makes the body ejected into the air which causes the body to be out of contact with the ground or from the tool and for a moment causes a flying phase. The game of jumping rope is potentially used as a medium. The study aimed to find out the steps to increase children's jumping ability through a game of jumping rope in group B TK Pertiwi 3 Karanganyar. The subjects in this study were children aged 5-6 years at Pertiwi 3 Karanganyar Kindergarten. The total number of children is 15 children, consisting of 7 girls and 8 boys. data collection method in the form of observation sheets and documentation. Based on the empirical data obtained through this research, it shows that before the implementation of the pre-action, the increase was 46.67% with the Start of Development (MB) criteria. After the action was held in cycle I, it increased by 61.67% or with the criteria of Developing According to Expectations (BSH) but these results had not yet reached an indicator of success, namely 80%, for this reason, the researcher held an advanced cycle of cycle II which achieved 80.33% success or with Very Well Developed (BSB) criteria. Therefore, learning the ability to jump through rope jumping games in Group B TK Pertiwi 3 Karanganyar, Sambungmacan District, Sragen Regency was said to be successful and achieved indicators of success in research and the research was stopped

Mitochondrial DNA Variation Contributes to the Aptitude for Dressage and Show Jumping Ability in the Holstein Horse Breed.

Simple SummaryIn the Holstein horse breed, maternal lineages are considered to be of major importance for the breeding success and can be examined through analysis of the maternally inherited mitochondrial DNA (mtDNA). Since mitochondrial genes are involved in energy metabolism, variation might contribute to differences in performance characteristics, as has already been pointed out in humans and racehorses with respect to endurance. No corresponding studies have yet been conducted for the athletic performance of warmblood breeds and, thus, the aim of this study was to investigate the influence of mitochondrial variation on the performance of Holstein mares. The data set used for this study was composed of both sequenced and non-sequenced mares of 75 maternal lineages as a previous study revealed that Holstein mares within a maternal lineage had identical mtDNA haplotypes regarding their non-synonymous variants. Association analyses were performed using estimated breeding values (EBVs) based on information from sport and breeding events. We observed mitochondrial single nucleotide polymorphisms (SNPs) significantly associated with one or more of the examined EBVs and identified mitochondrial haplogroups with a particular aptitude for dressage or show jumping.Maternal lineages are considered an important factor in breeding. Mitochondrial DNA (mtDNA) is maternally inherited and plays an important role in energy metabolism. It has already been associated with energy consumption and performances, e.g., stamina in humans and racehorses. For now, corresponding studies are lacking for sport performance of warmblood breeds. MtDNA sequences were available for 271 Holstein mares from 75 maternal lineages. As all mares within a lineage showed identical haplotypes regarding the non-synonymous variants, we expanded our data set by also including non-sequenced mares and assigning them to the lineage-specific haplotype. This sample consisting of 6334 to 16,447 mares was used to perform mitochondrial association analyses using breeding values (EBVs) estimated on behalf of the Fédération Équestre Nationale (FN) and on behalf of the Holstein Breeding Association (HOL). The association analyses revealed 20 mitochondrial SNPs (mtSNPs) significantly associated with FN-EBVs and partly overlapping 20 mtSNPs associated with HOL-EBVs. The results indicated that mtDNA contributes to performance differences between maternal lineages. Certain mitochondrial haplogroups were associated with special talents for dressage or show jumping. The findings encourage to set up innovative genetic evaluation models that also consider information on maternal lineages.

Leg Length and Running Speed Against Squat Long Jump Ability

This study aims to determine the relationship between leg length and running speed on the squat style long jump ability. This research belongs to the type of descriptive research. The population of this study was all students of SD 154 Waecekke'e, Lappariaja District, Bone Regency. The Makassar Model State with a total sample of 40 female students selected by random sampling. The data analysis technique used is correlation and regression analysis technique using the SPSS version 15.00 system at a significant level of 95% or 0.05. Starting from the results of data analysis, this study concludes that: (1) There is a significant relationship between leg length and squat style long jump ability in elementary school students 154 Waecekke'e, Lappariaja District, Bone Regency, it is proven that the value of ro = -0.845 (P &lt; = 0.05); (2) There is a significant relationship between running speed and long jump squatting ability in SD 154 Waecekke'e Students, Lappariaja District, Bone Regency, it is proven that the value of ro = 0.771 (P &lt; = 0.05); and, (3) There is a significant relationship between leg length and running speed on the long jump ability of the squat style at SD 154 Waecekke'e Students, Lappariaja District, Bone Regency, it is proven that the value of Ro = 0.847 (P &lt; = 0.05).

The R369 Myosin Residue within Loop 4 Is Critical for Actin Binding and Muscle Function in Drosophila.

The myosin molecular motor interacts with actin filaments in an ATP-dependent manner to yield muscle contraction. Myosin heavy chain residue R369 is located within loop 4 at the actin-tropomyosin interface of myosin’s upper 50 kDa subdomain. To probe the importance of R369, we introduced a histidine mutation of that residue into Drosophila myosin and implemented an integrative approach to determine effects at the biochemical, cellular, and whole organism levels. Substituting the similarly charged but bulkier histidine residue reduces maximal actin binding in vitro without affecting myosin ATPase activity. R369H mutants exhibit impaired flight ability that is dominant in heterozygotes and progressive with age in homozygotes. Indirect flight muscle ultrastructure is normal in mutant homozygotes, suggesting that assembly defects or structural deterioration of myofibrils are not causative of reduced flight. Jump ability is also reduced in homozygotes. In contrast to these skeletal muscle defects, R369H mutants show normal heart ultrastructure and function, suggesting that this residue is differentially sensitive to perturbation in different myosin isoforms or muscle types. Overall, our findings indicate that R369 is an actin binding residue that is critical for myosin function in skeletal muscles, and suggest that more severe perturbations at this residue may cause human myopathies through a similar mechanism.

Mechanical Design and Performance Analysis of a Weevil-Inspired Jumping Mechanism

Jumping mechanisms constitute an important means of resolution in applications such as crossing uneven terrain and space exploration. However, the traditional design mainly uses engineering design thinking, but seldom studies the structural characteristics of organisms themselves and lacks biomimetic research basis, which leads to the difference between jumping mechanism and biological structure and its jumping ability. On the other hand, it lacks in-depth study on biological jumping mechanism from the view of engineering. Weevil has excellent jumping performance, and its key jumper structure is specially designed by biologist. To investigate the motion mechanism and working mechanism of the jumping mechanisms, this paper takes the weevil as the bionic object, and designs a weevil-inspired jumping mechanism. A miniature prototype is designed to reproduce weevil’s jumping mechanism with its working principle and anatomical structure to verify how weevil’s jumping mechanisms work, and turns out to perform well at jumping height. This paper is presented the anatomical structure and working principle of the weevil jumping mechanism, followed by explanation and analysis of its kinematics and dynamics, then performing virtual prototype simulations to compare different design schemes, with results guiding the parameter optimization and subjecting a prototype machine into a height test. In comparisons among existing jumping mechanisms whose jumping method is bio-inspired, the present design, which weighs 44.7 g and can jump to a maximum height of 2 m. The present research establishes a biologically inspired working principle and provides a new practical archetype in biologically inspired studies.

The association between reactive strength index and reactive strength index modified with approach jump performance.

Jumping performance is one of the key components of volleyball game, thus evaluating jumping ability through different biomechanical variables offers opportunity for performance optimization. The aim of this study was to assess the associations between reactive strength index (RSI), reactive strength index modified (RSImod) and approach jump performance in male volleyball players. Forty volleyball players performed drop jump (DJ) form 40 cm high box, bilateral and unilateral countermovement jumps (CMJ) and approach jump. RSI in DJ was calculated as the ratio between jump height and ground contact time, while the RSI in CMJ tasks (RSImod) was calculated as ratio between jump height and jump time. Our results indicate that the relationships among different RSI variants and approach jump in volleyball players are moderate to strong (r = 0.42–0.73), with the highest correlations being observed for RSImod from bilateral CMJ (r = 0.676–0.727). Those observations are in line with the principle of movement specificity, which suggests that the best performance indicator should be the task that best resembles the demands of the sport-specific movements. Further research is needed to reveal more about the potential of implementing these findings for training optimization through monitoring RSI and RSImod values.

Anaerobic Speed Reserve, Sprint Force-Velocity Profile, Kinematic Characteristics, and Jump Ability among Elite Male Speed- and Endurance-Adapted Milers.

This study aimed to compare sprint, jump performance, and sprint mechanical variables between endurance-adapted milers (EAM, specialized in 1500–3000-m) and speed-adapted milers (SAM, specialized in 800–1500 m) and to examine the relationships between maximal sprint speed (MSS), anaerobic speed reserve (ASR), sprint, jump performance, and sprint mechanical characteristics of elite middle-distance runners. Fifteen participants (8 EAM; 7 SAM) were evaluated to obtain their maximal aerobic speed, sprint mechanical characteristics (force–velocity profile and kinematic variables), jump, and sprint performance. SAM displayed greater MSS, ASR, horizontal jump, sprint performance, and mechanical ability than EAM (p < 0.05). SAM also showed higher stiffness in the 40-m sprint (p = 0.026) and a higher ratio of horizontal-to-resultant force (RF) at 10 m (p = 0.003) and RFpeak (p = 0.024). MSS and ASR correlated with horizontal (r = 0.76) and vertical (r = 0.64) jumps, all sprint split times (r ≤ −0.85), stiffness (r = 0.86), and mechanical characteristics (r ≥ 0.56) during the 100-m sprint, and physical qualities during acceleration (r ≥ 0.66) and sprint mechanical effectiveness from the force–velocity profile (r ≥ 0.69). Season-best times in the 800 m were significantly correlated with MSS (r = −0.86). Sprint ability has a crucial relevance in middle-distance runners’ performance, especially for SAM.

The Effect of 16 Weeks of Lower-Limb Strength Training in Jumping Performance of Ballet Dancers.

Jumping ability is considered a determinant of performance success. It is identified as one of the predictors and talent identification in many sports and dance. This study aimed to investigate the effect of 16 weeks of lower-limb strength training on the jumping performance of ballet dancers. A total of 24 participants from the same dance school were randomly selected in the control group [CG; n = 10; aged 13.00 (1.49) years; 43.09 (9.48) kg and 1.53 (0.11) m] and the intervention group [IG; n = 14; aged 12.43 (1.45) years; 38.21 (4.38) kg and 1.51 (0.07) m], evaluated before and after the applied strength training program mainly using the body weight of each participant. Jump performance was assessed using MyJump2, a scientifically validated mobile phone app. Intergroup and intragroup comparisons were assessed, and the magnitude of change was calculated using the effect size (ES). While CG significantly decreased the relative power over time (p < 0.001, ES = −0.29: small), results from the intragroup comparisons suggest that IG significantly increased the countermovement jump (CMJ) height (p < 0.001, ES = 1.21: large), the relative force (p < 0.001, ES = 0.86: moderate), maximal velocity (p < 0.001, ES = 1.15: moderate), and relative power (p < 0.001, ES = 1.37: large). We concluded that a 16-week strength training program of lower limbs is an effective way to improve CMJ height in young dancers. Supplementary strength training appears to be the determinant for the improvement of the jumping performance of ballet dancers.

Jump ability in relation to ball speed during windmill pitching by female softball pitchers:

Jump ability in relation to ball speed during windmill pitching by female softball pitchers:

The Effects of an Alternative Training Method on Physical and Technical Abilities of Adolescent Soccer Players: A Pilot Study

This study examined the effects of an alternative strength training method during soccer training on the development of physical and technical abilities of youth soccer players. 17 soccer players (age: 15±0.5 years) were divided in a control group (CG) and an experimental group (EG). The players of the EG wore a "weight shorts", with 300 gr of additional weight on each thigh, while they participated into 3 regular soccer training sessions per week, for 12 weeks. The CG followed the same training program without wearing the “weighted shorts”. Before and after 12 weeks of training, anthropometric characteristics, 10- and 30- m speed, the Arrowhead change-of-direction test, the Illinois agility test with ball, the countermovement jump, and the 5-repetition maximum (5RM) load at the split squat, leg extension and leg curl were measured. The EG improved significantly (p< 0.05) more in comparison with the CG in countermovement jump, leg extension and split squat (left leg) 5RM load. The addition of weights on the thighs using special shorts during soccer training sessions leads to increased jumping ability and lower limbs maximal strength in youth soccer players.

小学生および中学生における両脚および片脚踏切跳躍能力の発達特性

小学生および中学生における両脚および片脚踏切跳躍能力の発達特性