To Determine the Effect of Dynamic Stretching in Lower Limb on Vertical Jump Height in Recreational Athletes and Collegiate Students

2020 ◽  
Author(s):  
yachika Gba ◽  
Shashank Kaushik ◽  
sajjad alam ◽  
Shahiduz Zafar ◽  
pooja kukreti ◽  
...  
Keyword(s):  
Lower Limb ◽  
Vertical Jump ◽  
Jump Height ◽  
Dynamic Stretching ◽  
Recreational Athletes ◽  
Vertical Jump Height

Influence of a preventive training program on lower limb kinematics and vertical jump height of male volleyball athletes

2013 ◽  
Vol 14 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Gustavo Leporace ◽  
Jomilto Praxedes ◽  
Glauber Ribeiro Pereira ◽  
Sérgio Medeiros Pinto ◽  
Daniel Chagas ◽  
...  
Keyword(s):  
Training Program ◽  
Lower Limb ◽  
Vertical Jump ◽  
Jump Height ◽  
Vertical Jump Height ◽  
Limb Kinematics ◽  
Lower Limb Kinematics

scholarly journals Strength and vertical jump performance changes in elite male volleyball players during the season (Cambios en el rendimiento en fuerza y salto vertical en jugadores de élite masculinos de voleibol durante la temporada)

Retos ◽  
2018 ◽  
pp. 291-294
Author(s):  
Miguel Sánchez Moreno ◽  
Carlos García Asencio ◽  
Juan José González Badillo ◽  
David Díaz Cueli
Keyword(s):  
Beneficial Effect ◽  
Strength Training ◽  
Physical Performance ◽  
Lower Limb ◽  
Vertical Jump ◽  
Jump Height ◽  
Jump Performance ◽  
Vertical Jump Height ◽  
Competitive Season ◽  
Volleyball Players

Abstract. This study aimed to analyze the effect of strength training on physical performance in elite male volleyball players during the competitive season. Athletes were assessed at the start of season (SS), midpoint of the competitive season (MS), and at the end of the season (ES). Significant increases were observed in vertical jump height (CMJ), jump squat height (JS) and mean propulsive velocity (MPV) from SS to ES (P < 0.05). Likely beneficial increases were observed on CMJ from SS to MS, on JS from SS to MS and from MS to ES. In addition, likely beneficial effect was found on MPV from MS to ES. Over the full season (SS to ES), very likely beneficial effect was observed on CMJ, MPV and JS. In conclusion, increase in strength of lower limb and vertical jump can be achieved in professional volleyball players over a full playing season. Resumen. El objetivo del estudio fue analizar los efectos de un programa de entrenamiento de fuerza sobre el rendimiento en la fuerza del miembro inferior y la capacidad de salto vertical en jugadores de voleibol masculinos durante la temporada de competición. Los atletas fueron evaluados al inicio (SS), a la mitad (MS) y al final de la temporada (ES). Se observaron aumentos significativos en la altura del salto vertical (CMJ), del salto con cargas (JS) y en la velocidad media propulsiva (MPV) alcanzada con las cargas comunes en el ejercicio de sentadillas entre SS y ES (P < 0.05). El análisis basado en la magnitud del cambio reveló un aumento probable en CMJ de SS a MS, y en JS de SS a MS y de MS a ES. Además, un incremento probable se encontró en MPV de MS a ES. Durante la temporada completa (SS a ES), se observó un aumento muy probable en CMJ, en MPV y JS. En conclusión, se puede lograr un aumento en la fuerza de la extremidad inferior y el salto vertical en jugadores profesionales de voleibol durante una temporada de juego completa.

scholarly journals Force-Sensitive Mat for Vertical Jump Measurement to Assess Lower Limb Strength: Validity and Reliability Study (Preprint)

2021 ◽  
Author(s):  
Erik Vanegas ◽  
Yolocuauhtli Salazar ◽  
Raúl Igual ◽  
Inmaculada Plaza
Keyword(s):  
Lower Limb ◽  
Vertical Jump ◽  
Sampling Frequency ◽  
Coefficient Of Determination ◽  
Jump Height ◽  
Countermovement Jump ◽  
Raw Data ◽  
Vertical Jump Height ◽  
High Sampling ◽  
The Impact

BACKGROUND Vertical jump height is widely used in health care and sports fields to assess muscle strength and power from lower limb muscle groups. Different approaches have been proposed for vertical jump height measurement. Some commonly used approaches need no sensor at all; however, these methods tend to overestimate the height reached by the subjects. There are also novel systems using different kind of sensors like force-sensitive resistors, capacitive sensors, and inertial measurement units, among others, to achieve more accurate measurements. OBJECTIVE The objective of this study is twofold. The first objective is to validate the functioning of a developed low-cost system able to measure vertical jump height. The second objective is to assess the effects on obtained measurements when the sampling frequency of the system is modified. METHODS The system developed in this study consists of a matrix of force-sensitive resistor sensors embedded in a mat with electronics that allow a full scan of the mat. This mat detects pressure exerted on it. The system calculates the jump height by using the flight-time formula, and the result is sent through Bluetooth to any mobile device or PC. Two different experiments were performed. In the first experiment, a total of 38 volunteers participated with the objective of validating the performance of the system against a high-speed camera used as reference (120 fps). In the second experiment, a total of 15 volunteers participated. Raw data were obtained in order to assess the effects of different sampling frequencies on the performance of the system with the same reference device. Different sampling frequencies were obtained by performing offline downsampling of the raw data. In both experiments, countermovement jump and countermovement jump with arm swing techniques were performed. RESULTS In the first experiment an overall mean relative error (MRE) of 1.98% and a mean absolute error of 0.38 cm were obtained. Bland-Altman and correlation analyses were performed, obtaining a coefficient of determination equal to <i>R</i><sup>2</sup>=.996. In the second experiment, sampling frequencies of 200 Hz, 100 Hz, and 66.6 Hz show similar performance with MRE below 3%. Slower sampling frequencies show an exponential increase in MRE. On both experiments, when dividing jump trials in different heights reached, a decrease in MRE with higher height trials suggests that the precision of the proposed system increases as height reached increases. CONCLUSIONS In the first experiment, we concluded that results between the proposed system and the reference are systematically the same. In the second experiment, the relevance of a sufficiently high sampling frequency is emphasized, especially for jump trials whose height is below 10 cm. For trials with heights above 30 cm, MRE decreases in general for all sampling frequencies, suggesting that at higher heights reached, the impact of high sampling frequencies is lesser.

scholarly journals Force-Sensitive Mat for Vertical Jump Measurement to Assess Lower Limb Strength: Validity and Reliability Study

10.2196/27336 ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. e27336
Author(s):  
Erik Vanegas ◽  
Yolocuauhtli Salazar ◽  
Raúl Igual ◽  
Inmaculada Plaza
Keyword(s):  
Lower Limb ◽  
Vertical Jump ◽  
Sampling Frequency ◽  
Coefficient Of Determination ◽  
Jump Height ◽  
Countermovement Jump ◽  
Raw Data ◽  
Vertical Jump Height ◽  
High Sampling ◽  
The Impact

Background Vertical jump height is widely used in health care and sports fields to assess muscle strength and power from lower limb muscle groups. Different approaches have been proposed for vertical jump height measurement. Some commonly used approaches need no sensor at all; however, these methods tend to overestimate the height reached by the subjects. There are also novel systems using different kind of sensors like force-sensitive resistors, capacitive sensors, and inertial measurement units, among others, to achieve more accurate measurements. Objective The objective of this study is twofold. The first objective is to validate the functioning of a developed low-cost system able to measure vertical jump height. The second objective is to assess the effects on obtained measurements when the sampling frequency of the system is modified. Methods The system developed in this study consists of a matrix of force-sensitive resistor sensors embedded in a mat with electronics that allow a full scan of the mat. This mat detects pressure exerted on it. The system calculates the jump height by using the flight-time formula, and the result is sent through Bluetooth to any mobile device or PC. Two different experiments were performed. In the first experiment, a total of 38 volunteers participated with the objective of validating the performance of the system against a high-speed camera used as reference (120 fps). In the second experiment, a total of 15 volunteers participated. Raw data were obtained in order to assess the effects of different sampling frequencies on the performance of the system with the same reference device. Different sampling frequencies were obtained by performing offline downsampling of the raw data. In both experiments, countermovement jump and countermovement jump with arm swing techniques were performed. Results In the first experiment an overall mean relative error (MRE) of 1.98% and a mean absolute error of 0.38 cm were obtained. Bland-Altman and correlation analyses were performed, obtaining a coefficient of determination equal to R2=.996. In the second experiment, sampling frequencies of 200 Hz, 100 Hz, and 66.6 Hz show similar performance with MRE below 3%. Slower sampling frequencies show an exponential increase in MRE. On both experiments, when dividing jump trials in different heights reached, a decrease in MRE with higher height trials suggests that the precision of the proposed system increases as height reached increases. Conclusions In the first experiment, we concluded that results between the proposed system and the reference are systematically the same. In the second experiment, the relevance of a sufficiently high sampling frequency is emphasized, especially for jump trials whose height is below 10 cm. For trials with heights above 30 cm, MRE decreases in general for all sampling frequencies, suggesting that at higher heights reached, the impact of high sampling frequencies is lesser.

scholarly journals Comparative Effects of Dynamic Stretching and Cryotherapy on the Physical Performance in Recreational Football Players: A Randomised Crossover Study

2021 ◽  
Vol 07 (03) ◽  
pp. 10-15
Author(s):  
Kalpana Zutshi ◽  
Keyword(s):  
Crossover Study ◽  
Vertical Jump ◽  
P Value ◽  
Football Players ◽  
Jump Height ◽  
Dynamic Stretching ◽  
Vertical Jump Height ◽  
Significant Difference ◽  
Group A ◽  
Group B

Background: It has been seen that the effects of dynamic stretching and cryotherapy has good effects in the performance of the football players. There are enough evidences and literature on both individually but the comparison between the two was not found. So, with the same concept comparison has been taken out with some interventions in the recreational football players. Purpose of Study: The purpose of this study was to check the comparative effects of both the interventions upon different variables like vertical jump height, agility and 20 meter sprint. Methodology: 30 subjects were taken, who were divided into 2 groups. The first group received dynamic stretching first and then cryotherapy and the second group vice-versa. Further, after a period of 48 hours of flush out time the interventions were reversed to both the groups. Pre and post readings of variables were taken: vertical jump height, agility and 20 meter sprint. Result: Vertical jump height test was significant for both the groups, after dynamic stretching. Vertical Jump height test had a significant p-value of 0.01 in group A and non-significant value for group B, after cryotherapy that is 0.531. T-test was significant for group A with a p value of 0.01 and non-significant for group B with a P value of 0.481. Significant for group B after cryotherapy with a p-value of 0.061. Conclusion: It can be inferred from the result of the study that each Variable: vertical jump height increased significantly in Group A and B after stretching but there was no significance in group B in the vertical jump height test in which cryotherapy was given first. Cryotherapy significantly increased the 20 meter sprint. Agility increased with dynamic stretching. On comparing the two groups-A and B, it was found that the sequence of altered interventions given (dynamic stretching/ cryotherapy) do not give any significant difference in the results as a whole.

Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players

2021 ◽  
pp. 1-8
Author(s):  
Junta Iguchi ◽  
Minoru Matsunami ◽  
Tatsuya Hojo ◽  
Yoshihiko Fujisawa ◽  
Kenji Kuzuhara ◽  
...  
Keyword(s):  
Performance Test ◽  
Vertical Jump ◽  
American Football ◽  
Football Players ◽  
Jump Height ◽  
Test Results ◽  
Repetition Maximum ◽  
Vertical Jump Height ◽  
Division 1 ◽  
And Performance

BACKGROUND: Few studies have investigated the variations in body composition and performance in Japanese collegiate American-football players. OBJECTIVE: To clarify what characterizes competitors at the highest levels – in the top division or on the starting lineup – we compared players’ body compositions and performance test results. METHODS: This study included 172 players. Each player’s body composition and performance (one-repetition maximum bench press, one-repetition maximum back squat, and vertical jump height) were measured; power was estimated from vertical jump height and body weight. Players were compared according to status (starter vs. non-starter), position (skill vs. linemen), and division (1 vs. 2). Regression analysis was performed to determine characteristics for being a starter. RESULTS: Players in higher divisions and who were starters were stronger and had more power, greater body size, and better performance test results. Players in skill positions were relatively stronger than those in linemen positions. Vertical jump height was a significant predictor of being a starter in Division 1. CONCLUSION: Power and vertical jump may be a deciding factor for playing as a starter or in a higher division.

Effects of plyometric jump training in female soccer player’s vertical jump height: A systematic review with meta-analysis

2020 ◽  
Vol 38 (13) ◽  
pp. 1475-1487 ◽  
Author(s):  
Rodrigo Ramirez-Campillo ◽  
Javier Sanchez-Sanchez ◽  
Blanca Romero-Moraleda ◽  
Javier Yanci ◽  
Antonio García-Hermoso ◽  
...  
Keyword(s):  
Systematic Review ◽  
Meta Analysis ◽  
Vertical Jump ◽  
Jump Height ◽  
Jump Training ◽  
Vertical Jump Height

scholarly journals Vertical jump fatigue does not affect intersegmental coordination and segmental contribution

2014 ◽  
Vol 20 (3) ◽  
pp. 303-309 ◽  
Author(s):  
Gleber Pereira ◽  
Paulo B. de Freitas ◽  
Jose A. Barela ◽  
Carlos Ugrinowitsch ◽  
André L. F. Rodacki ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Coordination Pattern ◽  
Jump Height ◽  
Movement Duration ◽  
Intersegmental Coordination ◽  
Vertical Jump Height ◽  
Movement Synergy ◽  
Vertical Jumps

The aim of this study was to describe the intersegmental coordination and segmental contribution during intermittent vertical jumps performed until fatigue. Seven male visited the laboratory on two occasions: 1) the maximum vertical jump height was determined followed by vertical jumps habituation; 2) participants performed intermittent countermovement jumps until fatigue. Kinematic and kinetic variables were recorded. The overall reduction in vertical jump height was 5,5%, while the movement duration increased 10% during the test. The thigh segment angle at movement reversal significantly increased as the exercise progressed. Non-significant effect of fatigue on movement synergy was found for the intersegmental coordination pattern. More than 90% of the intersegmental coordination was explained by one coordination pattern. Thigh rotation contributed the most to the intersegmental coordination pattern, with the trunk second and the shank the least. Therefore, one intersegmental coordination pattern is followed throughout the vertical jumps until fatigue and thigh rotation contributes the most to jump height.

scholarly journals Effects of Kettlebell Swing vs. Explosive Deadlift Training on Strength and Power

2017 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Matthew R. Maulit ◽  
David C. Archer ◽  
Whitney D. Leyva ◽  
Cameron N. Munger ◽  
Megan A. Wong ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Jump Height ◽  
Strength And Conditioning ◽  
Vertical Jump Height ◽  
Jump Power

Background: Recent research has compared explosive deadlift to kettlebell training observing their effects on strength. The kettlebell swing is a popular practical exercise as it shares share a hip hinge movement with the explosive deadlift, but the two have not been compared. Objectives: The purpose of this study was to compare the effects of kettlebell swing vs. explosive deadlift training on strength and power. Methods: Thirty-one recreationally resistance-trained men (age = 23.1 ± 2.3 years, height = 175.5 ± 6.6 cm, mass = 83.9 ± 13.8 kg, 1RM deadlift = 159.9 ± 31.7 kg) were randomly assigned to one of two groups [kettlebell swing group (KBG) n = 15, or explosive deadlift group (EDLG) n = 16]. Vertical jump height, isometric mid-thigh pull (MTP), and 1RM deadlift were measured pre and post training. Both groups trained twice per week for 4 weeks. Volume and load were increased after the first 2 weeks of training. Results: A 2 (time) x 2 (group) mixed factor ANOVA revealed a significant (P<0.05) increase in deadlift 1RM (pre: 159.9 ± 31.7 kg, post: 168.9 ± 31.8 kg) and vertical jump height (pre: 56.6 ± 9.9 cm, post: 57.9 ± 9.7 cm) for both groups, but were not significantly different between groups. There were no significant changes in MTP. Conclusions: Strength and conditioning professionals may use both kettlebell swings and explosive deadlifts to increase deadlift strength and vertical jump power.

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