Leg Muscle Strength Research Articles

Impact of core muscle strengthening on knee pain, patient outcomes, physical function, and cartilage thickness in knee osteoarthritis: Protocol for a randomized controlled trial

Knee Osteoarthritis (KOA) is a degenerative condition that significantly impacts individuals, causing disability. Routine rehabilitation methods primarily involve knee and hip strengthening exercises. While there is limited evidence supporting the potential benefits of core muscle strengthening in KOA rehabilitation, further research is needed to examine the effects of a structured core muscle strengthening protocol on pain, functional abilities, quality of life, and knee cartilage health. This double-blind, randomized controlled trial seeks to investigate the impact of integrating core muscle strengthening into routine rehabilitation. The study will randomly assign 80 participants to either routine rehabilitation or experimental groups, with both groups receiving routine rehabilitation combined with core strengthening exercises in the experimental group over a twelve-week period. The outcomes measured will include pain levels, patient-reported outcomes, physical functional abilities, core muscle and leg muscle strength, and cartilage height of the femur and tibia. Follow-up assessments will occur in the 4th, 8th, and 12th weeks. This novel study aims to provide valuable insights into the role of core strengthening in KOA rehabilitation, potentially influencing rehabilitation approaches and managing disease progression.•Incorporating core muscle strengthening into routine rehabilitation for KOA could open new possibilities for KOA management.•This study employs outcome measures recommended by OARSI for a thorough evaluation.•Additionally, it will investigate the impact on cartilage health, offering fresh insights into disease progression and the effects of exercise

Analysis of Running Techniques and Physical Factors on the Sprinter Ability of Grade V Elementary School

This study investigates the relationship between running techniques, physical factors, and the sprinting abilities of fifth-grade elementary school students. Through direct observation and measurement of students’ running techniques, as well as assessments of their physical attributes such as speed, leg muscle strength, and flexibility. This research aims to identify key factors that contribute to sprinting performance. Statistical analysis reveals a significant positive correlation between proper running techniques characterized by a forward-leaning posture, synchronized arm-leg movements, and correct foot landing and enhanced sprinting ability. Furthermore, the analysis highlights the importance of physical factors, with findings showing that students possessing greater leg muscle strength and flexibility exhibit superior sprinting capabilities. The correlation analysis underscores the strong influence of both running techniques and physical attributes on sprinting performance, indicating that improvements in these areas can lead to enhanced athletic outcomes. These findings have practical implications for the development of targeted training programs in elementary schools, emphasizing the enhancement of running techniques and physical conditioning. By focusing on structured training that incorporates muscle strengthening, flexibility improvement, and technique refinement, educators can help students maximize their athletic potential and encourage lifelong healthy habits. This research contributes to a deeper understanding of the factors influencing sprinting abilities and offers a foundation for optimizing physical education practices for young athletes.

The Level of Accuracy of the Expert System Training Data Uses the Naive Bayes Algorithm to Measure the Distance of A Ball Kick

The importance of data accuracy in the implementation of long-distance kicking tests as basic data for coaches requires adequate facilities and requires large costs, so technology is needed for facility and budget efficiency. The purpose of this research is to determine the accuracy of expert system training data using the Naive Bayes algorithm to measure the distance of a ball kick. The research design used is a quantitative method with an experimental model. The type of experimental design is pre-experimental design. Participants amounted to 100 male soccer players with saturated sample technique. The instruments were question forms to obtain information on gender and age, while to measure leg muscle strength and leg muscle strength using a tape roll meter and leg dynamometer. Data validity uses calibrated tools. The data analysis technique uses probability (naive bayes) using data testing and evaluation. The results of the study obtained the accuracy level of the expert system training data using the naïve bayes algorithm with the best accuracy of 100%. There is a training data learning model used using the 99 scheme and test 1 and 98 and test 2. The conclusion is that the accuracy level of expert system training data using the naive bayes algorithm is declared to be accountable for use in classifying new data. The contribution for further research is testing using new data to determine the level of accuracy further to improve accuracy in learning training data.

Hubungan Daya Tahan Kekuatan Otot Tungkai dengan Laju Lari 100 M pada siswa Kelas VII-3 SMP Negeri 1 Bonepantai

In an effort to improve running ability, muscle strength endurance is very important. The aim of this research is to explain the relationship between the strength endurance of body movements, especially the leg or leg muscles, and the extent to which the ability to withstand the strength of the leg or leg muscles affects 100 meter running speed. junior high school students in grades VII�3. In this research, the correlation method is used simultaneously with a quantitative approach. To collect data, a Leg Dynamometer and a Stop Watch were used. Data is analyzed using simple methods and multiple correlations, along with the Product Moment formula. The results showed that (1) there was a significant relationship between leg muscle strength and running speed for 100 meters, with a correlation value of 0.449. The results show that (1) leg muscle endurance influences 100 m running speed because the calculated value is 2.510 > table is 2.008, and (2) variable X influences variable Y. The determination coefficient of 0.201 from this output shows that the influence of the independent variable ( leg muscle endurance) in the dependent variable (100 m running speed) is 20.1% and the significance value is 0.001<0.005

Protein Supplementation Increases Adaptations to Low-Volume, Intra-Session Concurrent Training in Untrained Healthy Adults: A Double-Blind, Placebo-Controlled, Randomized Trial.

Combined endurance and resistance training, also known as "concurrent training", is a common practice in exercise routines. While concurrent training offers the benefit of targeting both cardiovascular and muscular fitness, it imposes greater physiological demands on the body compared to performing each modality in isolation. Increased protein consumption has been suggested to support adaptations to concurrent training. However, the impact of protein supplementation on responses to low-volume concurrent training is still unclear. Forty-four untrained, healthy individuals (27 ± 6 years) performed two sessions/week of low-volume high-intensity interval training on cycle ergometers followed by five machine-based resistance training exercises for 8 weeks. Volunteers randomly received (double-blinded) 40 g of whey-based protein (PRO group) or an isocaloric placebo (maltodextrin, PLA group) after each session. Maximal oxygen consumption (VO2max) and overall fitness scores (computed from volunteers' VO2max and one-repetition maximum scores, 1-RM) significantly increased in both groups. The PRO group showed significantly improved 1-RM in all major muscle groups, while the PLA group only improved 1-RM in chest and upper back muscles. Improvements in 1-RM in leg muscles were significantly greater in the PRO group versus the PLA group. In conclusion, our results indicate that adaptations to low-volume concurrent training, particularly leg muscle strength, can be improved with targeted post-exercise protein supplementation in untrained healthy individuals.

Meningkatkan Kualitas Vertical Jump dengan Latihan Squad Jump

Effective physical exercises, such as squad jumps, are crucial for enhancing athletes' performance across various sports. Squad jump training focuses on developing the leg muscle strength essential for vertical jumping. According to recent studies by Tanaka et al. (2017) and Smith et al. (2019), this exercise has been shown to significantly improve athletes' vertical jump height. Tanaka et al. recorded an average increase of 5 cm in basketball athletes after 8 weeks of training, while Smith et al. reported a 10 cm increase in volleyball athletes after 12 weeks. Squad jump training offers several key benefits, including increased leg muscle strength, endurance, and jumping technique. This is supported by various studies demonstrating the effectiveness of this exercise in enhancing athletes' strength and jumping performance. Experts agree that incorporating squad jump exercises into regular training programs can help athletes achieve optimal performance in sports that require high jumping ability, such as basketball, volleyball, high jump, and gymnastics. The implementation of squad jump training should consider several important factors, such as the intensity, frequency, and correct training technique. Additionally, adequate recovery and rest are necessary to prevent injuries and enhance the effectiveness of the training. The main challenge in this exercise is maintaining consistency and motivation for athletes to continue training regularly. Coaches and athletes are advised to include squad jump exercises as part of strength training programs. By adhering to proper execution methods and obtaining guidance from competent fitness experts, athletes can maximize their potential to improve vertical jump quality. With dedication and discipline, squad jump training can be an effective tool for achieving top performance in various sports.

Evaluation of the Physical Condition of NTB Pelatda Athletes for the Kabaddi Sport Branch Towards Pon XXI Aceh North Sumatra in 2024

Physical condition is a prerequisite that an athlete must have in order to improve and develop optimal sporting performance. One of them is the NTB Kabaddi athlete who will compete in the XXI Aceh-North Sumatra PON event in 2024. The problem in this research is what the physical condition of the NTB regional athletes in the Kabaddi sport will be in the 2024 Aceh-North Sumatra PON XXI. The aim is to determine their physical condition. NTB regional athlete in the Kabaddi sport for PON XXI Aceh-North Sumatra in 2024. Physical condition includes Agility, Endurance and Leg Muscle Strength. This research is a quantitative descriptive study carried out by total sampling on NTB Pelatda Kabaddi athletes, totaling 12 male athletes and 12 female athletes. In the agility test (Illinois Agility Run Test), the average for male athletes was 17.17 in the Fair category, while the female athletes showed an average of 19.14 in the Fair category. The endurance test (MFT or Beep Test) shows that the average endurance test for male athletes is 43.9 in the Poor category, while female athletes have an average of 34.8 in the Poor category. And the leg muscle strength test (Leg Dynamometer) shows that the average score for the leg muscle strength test for male athletes is 229 in the Good category, for female athletes it is 177 in the Good category. From these results, when compared with the previous test, from the results of this evaluation there are still components of physical condition that do not meet the expected criteria, but these results can be used as a benchmark and motivation for athletes to prepare their physical condition better in the future.

Hubungan Kekuatan Otot Lengan dan Otot Tungkai terhadap Kemampuan Free Throw pada Peserta Ekstrakurikuler Bola Basket

This research was written according to what was on the field, namely that the women's basketball extracurricular participants at SMA Negeri 1 Ciasem when shooting free throws the ball did not reach the basketball hoop, although there were a few who could put the ball in but did not understand the basics. This raises a question that makes the author want to know the relationship between arm and leg muscle strength and free throw ability in female basketball extracurricular participants at SMA Negeri 1 Ciasem. With a total of 14 samples tested and 1x meeting for the test. To find out the relationship between arm and leg muscle strength on free throws, the author used a correlational method to find the relationship. From the results obtained, arm muscle strength has a sig value of 0.463, and leg muscle strength has a sig value of 0.463. This is an answer that arm muscle strength and leg muscle strength are not significant because the variables X1 and This is caused by several factors, namely: 1. The girls' basketball extracurricular coach at SMA Negeri 1 Ciasem does not have a training program. 2. Balance. 3. Eye view. 4. Mental. 5. Height.

Development of physical test norms for early age Pencak Silat

Background and Study Aim. The evaluation serves as a cornerstone in the continuous improvement of sports, significantly relying on the analysis of measurement data. The primary objective of this research is to develop tailored norms for physical tests specifically designed for early-age Pencak Silat practitioners. Material and Methods. The development of the test consisted of several key stages: design of the instrument, testing of the instrument, and finally, assembly of the instrument. The study included a total of 210 participants, with a breakdown of 111 male and 109 female martial artists. The techniques for data collection involved a variety of tests and measurements. The instruments used in this research included: sit-and-reach test for assessing flexibility, 30-meter sprint for speed evaluation, side step test for agility, sit-ups for abdominal strength, push-ups for arm and chest strength, wall sit test for leg muscle strength, and beep test for cardiovascular endurance. Data analysis was performed using a technique that grouped values into five standard categories, aided by the use of Microsoft Excel. Results. The findings of the study led to the establishment of norms for each component of the physical tests tailored to early-age Pencak Silat practitioners. These components have been classified into five distinct levels: very poor, poor, average, good, and excellent. Conclusions. The outcomes of this research facilitate the development of specific norms for each test item, incorporating weighting for every physical test component. These weightings have been meticulously adjusted in accordance with the primary energy systems utilized in the sport of Pencak Silat.

The effects of aerobic gymnastics training on performance-related variables in an elite athlete: a 2-year follow-up study.

This study investigates individual performance adaptations on 2years of training between European Aerobics Championships. An elite, 22-year-old aerobic gymnast performed postural coordination test, Y-Balance test, squat and countermovement jumps, 60s test of repeated jumps, an isokinetic leg muscle strength test, and the Wingate test. Postural stability and flexibility improved in terms of increased distance achieved in the Y-Balance test in the anterior (by 6.3%), posteromedial (by 2%), and posterolateral (by 4.8%) directions. Lower limb muscular endurance also increased, which can be corroborated by a reduced fatigue index in the 60s test of repeated jumps (from 42% to 27% after the 1st and to 22% after the 2nd year of training). In addition, mean power increased during dominant (by 23.2% at 60°/s and by 18.5% at 180°/s) and non-dominant leg extension (by 4.9% at 180°/s and by 15.5% at 300°/s), plus dominant leg flexion (by 2.0% at 60°/s and by 6.9% at 300°/s). Similarly, peak torque/body weight ratio increased during dominant (by 24.9% at 60°/s, by 11.5% at 180°/s, and by 2.1% at 300°/s) and non-dominant leg extension (by 0.5% at 60°/s and by 6.4% at 300°/s), plus dominant leg flexion (by 1.7% at 60°/s and by 5.4% at 300°/s). However, 2years of training failed to show any significant improvements in the explosive power of lower limbs and anaerobic performance. These findings indicate that general aerobic gymnastics training without any specific inputs leads to performance adaptation, namely, in abilities closely related to competition routine (dynamic balance and strength endurance of lower limbs).

Consuming soy flour after weight training: An alternative to increase leg muscle strength

Consuming soy flour after weight training: An alternative to increase leg muscle strength

The relationship between leg muscle strength and dynamic balance in skateboard players

Background: Skateboarding is a sport that utilizes a wheeled board as its equipment. As time progresses, skateboarding has evolved into one of the branches of professional sports, even having official competitions. It is popular among a wide range of young people and adults. Skateboarders must have good balance to stabilize their bodies and minimize the risk of falling and injury. It is maintaining balance while skateboarding requires strength in leg muscles, including flexors, extensors, dorsiflexors, plantar flexors, invertors, and evertors, with proper contraction ratios to stay balanced. The researchers aimed to investigate the relationship between leg muscle strength and dynamic balance in skateboard players. Skateboard players with greater leg muscle strength tend to maintain their balance better when performing tricks and maneuvers on the skateboard. Methods: The research was observational analytics with a cross-sectional approach. Purposive sampling was employed to select participants, resulting in a sample size of 51 skateboarders. Data collection involved measuring leg muscle strength and dynamic balance. Leg muscle strength was measured using a leg dynamometer, while dynamic balance was assessed using the y balance test. Results: The results showed a relationship between leg muscle strength and dynamic balance in skateboarders. Most samples exhibit muscular leg muscle strength, leading to a favorable dynamic balance. Conclusion: From the research findings, it can be concluded that there is a strong, significant, and inverse relationship between leg muscle strength and dynamic balance in skateboarders.

Higher expression of denervation-responsive genes is negatively associated with muscle volume and performance traits in the study of muscle, mobility, and aging (SOMMA).

With aging skeletal muscle fibers undergo repeating cycles of denervation and reinnervation. In approximately the 8th decade of life reinnervation no longer keeps pace, resulting in the accumulation of persistently denervated muscle fibers that in turn cause an acceleration of muscle dysfunction. The significance of denervation in important clinical outcomes with aging is poorly studied. The Study of Muscle, Mobility, and Aging (SOMMA) is a large cohort study with the primary objective to assess how aging muscle biology impacts clinically important traits. Using transcriptomics data from vastus lateralis muscle biopsies in 575 participants we have selected 49 denervation-responsive genes to provide insights to the burden of denervation in SOMMA, to test the hypothesis that greater expression of denervation-responsive genes negatively associates with SOMMA participant traits that included time to walk 400 meters, fitness (VO2peak), maximal mitochondrial respiration, muscle mass and volume, and leg muscle strength and power. Consistent with our hypothesis, increased transcript levels of: a calciumdependent intercellular adhesion glycoprotein (CDH15), acetylcholine receptor subunits (CHRNA1, CHRND, CHRNE), a glycoprotein promoting reinnervation (NCAM1), a transcription factor regulating aspects of muscle organization (RUNX1), and a sodium channel (SCN5A) were each negatively associated with at least 3 of these traits. VO2peak and maximal respiration had the strongest negative associations with 15 and 19 denervation-responsive genes, respectively. In conclusion, the abundance of denervationresponsive gene transcripts is a significant determinant of muscle and mobility outcomes in aging humans, supporting the imperative to identify new treatment strategies to restore innervation in advanced age.

Effect of Plyometrics Hexagonal Drill and Zig-Zag Drill with Muscle Strength towards Leg Muscle Power and Vo2max of the Volleyball Extracurricular Members of SMA Negeri 5 Kota Magelang

This research aims to determine: (1) the effect of hexagonal plyometrics and zig-zag drill training towards leg muscle power and vo2max, (2) the difference in the effect between high and low leg muscle strength towards leg muscle power and vo2max, and (3) the interaction between hexagon plyometrics training and zig-zag drill as well as leg muscle strength (high and low) towards leg muscle power and vo2max.This research method was an experiment with a 2x2 factorial design. In this research, the number of samples was for about 20 students who were selected by using purposive sampling. To measure leg muscle power, the researcher used the vertical jump instrument, for vo2max, used the bleep test (multi stage), and for leg muscle strength, used a leg dynamometer. The data analysis used a two-way ANOVA test with a significance level of 0.05. The results of this research are: (1) there is a significant difference in the effect of plyometrics hexagonal drill and zig-zag drill training towards leg muscle power and Vo2max of the volleyball extracurricular members, (2) there is a significant difference in the effect between low muscle strength and high muscle strength towards leg muscle power and Vo2max of the volleyball extracurricular members with a value < 0.05, and (3) there is no significant interaction between plyometrics training and leg muscle strength (high and low) towards leg muscle power and Vo2max of the volleyball extracurricular members with a value > 0.05.

Correlation of Leg Length and Leg Muscle Strength on Leg Muscle Explosive Power of Men's Volleyball Student Activity Unit (UKM) Participants, PGRI Mahadewa University Indonesia

This study is a correlational study, because there is no relationship (correlation) between free variables and bound variables. The study population was the participants of the Student Activity Unit (SAU) of Putra Volleyball Universitas PGRI Mahadewa Indonesia, the total number of 39 people, while the technique used to take samples was by inclusion and exclusion techniques, namely: of the same sex, age ranges from 18-22 years, with good physical fitness, height 170-190 cm, body weight between 65-85 kg, and willing to participate in research. From the results of the data analysis, the value of the multiple correlation coefficient (R) =0.946 was obtained. This shows that there is a very strong correlation between limb length and limb muscle strength and limb muscle explosiveness of the participants of Student Activity Unit (SAU) of Putra Volleyball Universitas PGRI Mahadewa indonesia. From the calculation of the coefficient of determination or coefficient of determination (CD) is obtained KP= 89.49%. This means that the length of the limb and the strength of the limb muscles determine or determine by 89.49% the explosive power of the limb muscles of the participants of Student Activity Unit (SAU) Putra Volleyball Universitas PGRI Mahadewa indonesia, while the remaining 10.51% was determined by other factors not studied in this study. The F test calculation obtained an F-count value of 153.29 greater than the F-table of 3.26; so Ho was rejected and Ha was accepted (significant). Thus, it can be concluded that, there is a correlation of limb length and limb muscle strength to limb muscle explosiveness of participants of Student Activity Unit (SAU) of Putra Volleyball Universitas PGRI Mahadewa Indonesia.

Implementasi Kegiatan Fisik Pada Kegiatan Senam Untuk Menstimulasi Perkembangan Fisik Pada Anak Sekolah Dasar

Every child needs activities that are beneficial for their health. One of the activities that can be done is rhythmic gymnastics. This study uses the literature review method. A literature review is an approach in a traditionally conducted literature review with the aim of collecting and critically evaluating various reference sources related to the topic being discussed. Every child needs physical activity for their physical development later on, the factors that affect physical development in children are gross motor physical development where children are not yet able to perform body movement activities in coordination, lack of body flexibility and balance in the strength of the child's leg muscles. Children's motor development can be said to be mature if children have body skills and a healthy way of life, with this can support strong, healthy and skillful physical growth. The form of activities that can develop gross motor skills in children is to invite children to exercise one of them with this rhythmic gymnastics, with this the child can freely move all his limbs.

The relationship between leg muscle strength and static balance in surfers

Background: Surfing is a type of water sport that involves playing on the waves by using a surfboard to maneuver on the waves. It requires good static balance and good leg muscle strength. Methods: The method used in the analytical cross-sectional study design. This research was conducted on February 25, 2023. The inclusion criteria for male surfers aged 18-25 years have ever surfed (nor in the training or learning process). According to the screening assessment, the exclusion criteria included individuals who have experienced a lower extremity injury in the last 3 months (except lacerations or injuries with open wounds). The sampling technique used was a nonprobability sampling method with a purposive sampling technique. The number of samples obtained in this research was 46 samples. Results: Data collection was carried out by measuring leg muscle strength and static balance. Leg muscle strength was measured with a leg dynamometer while static balance was measured with the Stork Standing Test. Based on the non-parametric Spearman rho analysis test, the value of p = 0.000 (p < 0.05) and the correlation coefficient r = 0.954. Conclusion: Based on the research results, it can be concluded that there was a significant relationship between leg muscle strength and static balance in surfers.

Relationship among muscle strength, muscle endurance, and skeletal muscle oxygenation dynamics during ramp incremental cycle exercise.

Peak oxygen uptake (VO2), evaluated as exercise tolerance, is a strong predictor of life prognosis regardless of health condition. Several previous studies have reported that peak VO2 is higher in those with a greater decrease in muscle oxygen saturation (SmO2) in the active muscles during incremental exercise. However, the skeletal muscle characteristics of individuals exhibiting a greater decrease in SmO2 during active muscle engagement in incremental exercise remain unclear. This study aimed to clarify the relationship among muscle strength, muscle endurance, and skeletal muscle oxygenation dynamics in active leg muscles during incremental exercise. Twenty-four healthy young men were included and categorized into the non-moderate-to-high muscular strength and endurance group (those with low leg muscle strength, endurance, or both; n = 11) and the moderate-to-high muscular strength and endurance group (those with both moderate-to-high leg muscle strength and endurance; n = 13). All participants underwent cardiopulmonary exercise testing combined with near-infrared spectroscopy to assess whole-body peak VO2 and the change in SmO2 at the lateral vastus lateralis from rest to each exercise stage as skeletal muscle oxygenation dynamics. A linear mixed-effects model, with the change in SmO2 from rest to each stage as the dependent variable, individual participants as random effects, and group and exercise load as fixed effects, revealed significant main effects for both group (P = 0.001) and exercise load (P < 0.001) as well as a significant interaction between the two factors (P < 0.001). Furthermore, multiple-comparison test results showed that the change in SmO2 from rest to 40%-100% peak VO2 was significantly higher in the moderate-to-high muscular strength and endurance group than in the non-moderate-to-high muscular strength and endurance group. Maintaining both muscle strength and endurance at moderate or higher levels contributes to high skeletal muscle oxygenation dynamics (i.e., greater decrease in SmO2) during moderate- or high-intensity exercise.

Features of the Correlation Relationship Between External Stress Still and Adaptive Changes in the Body of Mixed Martial Arts Athletes

Topicality. One of the most important aspects in the field of sports is determining the appropriateness of the loads used for the adaptation capabilities of the athletes' bodies. This is a key element in both the training and competition process, which requires immediate correction and the development of effective training systems with long-term prediction of results, not only in mixed martial arts, but in all other sports as well. The Purpose of the Research. To study the peculiarities of the correlation between the parameters of the working weight of the projectile and adaptive changes in the body of mixed martial arts (MMA) athletes in the process of special strength training. Methods. 50 shock style MMA athletes aged 19±0,7 took part in the study. Two research groups were formed. The representatives of the examined groups used experimental regimens of training sessions during 3 months of strength training. Correlation analysis was carried out between parameters of projectile working mass (m) and biochemical indicators of blood, anthropometry, bioimpedancemetry, control testing of the development of maximum strength of athletes. The Results. In the athletes of the first group at all stages of the study, it was found that a constant strong positive relationship (r&gt;0,70) is observed between the indicator of the working mass of the projectile (m=56–59 % of 1 RM) in the conditions of the regime of type A training loads (Ra=0,56) and the development of the maximum strength of leg muscles during the exercise «leg press on the block» (r=0,73), as well as the basal level of lactate dehydrogenase enzyme concentration in blood serum (r=0,72). The analysis of the results of the study obtained after 3 months of special strength training by the athletes of the second group of C-type training loads (Ra=0,74) indicate that the number of strong correlations has increased 9 times compared to the data found at the beginning of the experiment. It was established that the largest change in the level of correlations from moderate at the beginning of the study (on average r=0,57) to high after 3 months of training (on average r=0,87) occurred between the projectile working weight indicator and the results of the control testing the development of maximum muscle strength (chest muscles, shoulder and hip muscles) during control exercises. Findings. It was established that only among the athletes of the second group, who in the process of special strength training use the mode of training loads of type C (Ra=0,74), the correlations increase during 3 months of training, which indicates pronounced processes of long-term adaptation.

Differences in the effects of plyometric squat jumps and bileg band training on leg strength increases in volleyball players of different gender

Background and purpose This study aims to determine differences in the effects of plyometric jumps, squats, and double leg band training on leg muscle strength gains in volleyball players of different genders. Material and methods This study was conducted at SMP Negeri 3 Karanganyar, Jalan Lawu No. 86, Ngarjosari, Karanganyar Regency, Central Java. This study was conducted over a six-week period, beginning February 5, 2024, and ending March 16, 2024, with meetings occurring three times per week on Mondays, Wednesdays, and Fridays. The experimental method is chosen to identify certain symptoms through an intervention carried out on a test sample. An experiment is a design that allows researchers to simultaneously study the effects of two or more types of experimental variables. Results After the analysis in the group of men, an increase in leg strength indicators was obtained as a result of the experiment by 2.468%. Meanwhile, in the group of women, an increase in leg strength indicators was obtained as a result of the experiment by 2.892%. Comparing the two female groups, there is a higher percentage increase than the male groups, which is 2.892% in females compared to 2.468% in males. Thus, the female group showed a more pronounced increase in results than the male group, with a significance of p &lt; 0.05. Thus, hypothesis 2 «there is a difference in the growth of leg muscle strength as a result of training using plyometric exercises in male and female students» is accepted. Conclusions Significant differences in the indicators of leg muscle strength increase in male and female volleyball players as a result of the use of special training were revealed. This is evidenced by the average increase in leg muscle strength in men by 2.468%, and in women by 2.892% at p &lt; 0.05.