scholarly journals Effect of Drop Height on Vertical Jumping Performance in Pre-, Circa-, and Post-Pubertal Boys and Girls

2020 ◽  
Vol 32 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Anthony Birat ◽  
David Sebillaud ◽  
Pierre Bourdier ◽  
Eric Doré ◽  
Pascale Duché ◽  
...  
Keyword(s):  
Jump Height ◽  
Drop Height ◽  
Plyometric Training ◽  
Countermovement Jump ◽  
Jumping Performance ◽  
Vertical Jumping ◽  
Optimum Height ◽  
Drop Jumps ◽  
Pubertal Boys ◽  
Squat Jumps

Purpose: To examine the effect of drop height on vertical jumping performance in children with respect to sex and maturity status. Methods: Thirty-seven pre-pubertal, 71 circa-pubertal, and 69 post-pubertal boys and girls performed, in a randomized order, 2 squat jumps, 2 countermovement jumps, and 2 drop jumps (DJ) from heights of 20, 30, 40, 50, 60, and 70 cm. The trial with the best jump height in each test was used for analysis. Results: No significant sex × maturity status × jump type interaction for jump height was observed. However, on average, the children jumped higher in the countermovement jump than in squat jump and DJs (+1.2 and +1.6 cm, P < .001, respectively), with no significant differences between DJs and squat jumps or between DJs when increasing drop heights. Regarding DJs, 59.3% of the participants jumped higher from drop heights of 20 to 40 cm. Conclusions: Children, independent of sex and maturity status, performed best in the countermovement jump, and no performance gain was obtained by dropping from heights of 20 to 70 cm. During maturation, the use of drop heights between 20 and 40 cm may be considered in plyometric training, but the optimum height must be obtained individually.

Effects of Collagen Peptides on Recovery Following Eccentric Exercise in Resistance-Trained Males—A Pilot Study

2020 ◽  
pp. 1-8
Author(s):  
Joel L. Prowting ◽  
Debra Bemben ◽  
Christopher D. Black ◽  
Eric A. Day ◽  
Jason A. Campbell
Keyword(s):  
Muscle Soreness ◽  
Exercise Bout ◽  
Jump Height ◽  
Countermovement Jump ◽  
Connective Tissues ◽  
Maximal Voluntary Isometric Contraction ◽  
Collagen Peptides ◽  
Drop Jumps ◽  
Performance Decline ◽  
Time Point

The authors sought to determine whether consuming collagen peptides (CP) enhances musculoskeletal recovery of connective tissues following a damaging exercise bout. Resistance-trained males consumed 15 g/day of CP (n = 7) or placebo (n = 8), and after 7 days, maximal voluntary isometric contraction (MVIC), countermovement jump height, soreness, and collagen turnover were examined. Five sets of 20 drop jumps were performed and outcome measures were collected 24, 48, and 120 hr postexercise. Countermovement jump height was maintained in the CP group at 24 hr (PRE = 39.9 ± 8.8 cm vs. 24 hr = 37.9 ± 8.9 cm, p = .102), whereas the CP group experienced a significant decline at 24 hr (PRE = 40.4 ± 7.9 cm vs. 24 hr = 35.5 ± 6.4 cm, p = .001; d = 0.32). In both groups, muscle soreness was significantly higher than PRE at 24 hr (p = .001) and 48 hr (p = .018) but not at 120 hr (p > .05). MVIC in both legs showed a significant time effect (left: p = .007; right: p = .010) over the 5-day postexercise period. Neither collagen biomarker changed significantly at any time point. CP supplementation attenuated performance decline 24 hr following muscle damage. Acute consumption of CP may provide a performance benefit the day following a bout of damaging exercise in resistance-trained males.

Kinetic and Kinematic Changes in Vertical Jump in Prepubescent Girls After 10 Weeks of Plyometric Training

2020 ◽  
Vol 32 (2) ◽  
pp. 81-88 ◽  
Author(s):  
K. Katsikari ◽  
Eleni Bassa ◽  
Dimitrios Skoufas ◽  
Savvas Lazaridis ◽  
Christos Kotzamanidis ◽  
...  
Keyword(s):  
Contact Time ◽  
Control Group ◽  
Kinetic Properties ◽  
Plyometric Training ◽  
Countermovement Jump ◽  
Jump Performance ◽  
Squat Jump ◽  
Short Contact Time ◽  
Prolonged Contact ◽  
Drop Jumps

Purpose: To examine the effect of a 10-week plyometric training (PT) on the kinematic and kinetic properties of prepubescent girls during squat jump, countermovement jump, and drop jumps. Methods: Twenty-four untrained girls (aged 9–11 y) were assigned to a training group (TG) and a control group. The TG followed twice a week PT for 10 weeks. Squat jump, countermovement jump, and drop jumps performed from heights of 20, 35, and 50 cm were tested before and after PT. Jump height, kinematic, and kinetic parameters were evaluated using a motion analysis system and a force plate. Results: Jumping height in all jump types increased significantly after PT for the TG (P < .001). After training, the TG presented increased power (P < .001) and knee angular velocity (P < .001), higher knee flexion at the deepest point during the braking phase (P < .001), longer contact time (P < .001), and unchanged stiffness and reaction strength index (P > .05). No differences were observed in the control group (P > .05). Conclusion: These findings indicate that a 10-week PT positively affected jumping performance in prepubescent girls who improved their drop jump performance after training not by adopting a stiff/bouncing jumping style of short contact time and increased stiffness, but a compliant/absorbing style of prolonged contact time.

scholarly journals Effects of plyometric and pull training on performance and selected strength characteristics of junior male weightlifter

2019 ◽  
Vol 23 (3) ◽  
pp. 120-128 ◽  
Author(s):  
İ. İnce ◽  
A. Şentürk
Keyword(s):  
Training Program ◽  
Analysis Of Variance ◽  
Group Interaction ◽  
Strength Characteristics ◽  
Control Group ◽  
Jump Height ◽  
Plyometric Training ◽  
Countermovement Jump ◽  
Significant Difference ◽  
Main Effects

Purpose: The aim of this study was to investigate the effect of plyometric and pull training added an Olympic weightlifting training program (twice a week for 8 wk) on performance and selected strength characteristics in junior male weightlifter. Material: The participants [n = 34; age: 16.03 ± 0.9 y; mass: 74.78 ± 14.86 kg; height: 170.53 ± 6.81 cm] were randomized into a pull (n = 11), a plyometric (n = 12), and a control (n= 11) groups. The groups trained 6 days a week during the 8-week study period. The pull group performed four pull exercises and the plyometric group performed four plyometric exercises added to Olympic weightlifting program for 2 days a week, and the control group performed an Olympic weightlifting program alone. Analysis of variance and Magnitude-based inferences used to determine whether a significant difference existed among groups on snatch clean and jerk total (SCT), squat (SQ), back strength (BS), countermovement jump (CMJ), 30 sec. repeated jump height (RJH) and peak barbell velocity (PV). Results: The ANOVA showed a time × group interaction for SCT, BS and RJH. The MBI indicated positive changes for SCT in control group, for BS in pull group and for RJH in plyometric group. The results for the PV decrease in plyometric and pull group indicated no significant time × group interaction, but there was a significant main effects. ASK "Inserisci l'aim" \* MERGEFORMAT ASK \* MERGEFORMAT Conclusions: The results of this study showed that the addition of pull or plyometric training to an Olympic weightlifting program interfered with weightlifting performances.

scholarly journals Considerations for Single and Double Leg Drop Jumps: Bilateral Deficit, Standardizing Drop Height, and Equalizing Training Load

2014 ◽  
Vol 30 (6) ◽  
pp. 722-727 ◽  
Author(s):  
Matthew T.G. Pain
Keyword(s):  
Peak Power ◽  
Motor Units ◽  
Endurance Athletes ◽  
Jump Height ◽  
Drop Height ◽  
Bilateral Deficit ◽  
Motion Data ◽  
Concentric Force ◽  
Drop Jumps ◽  
Fast Twitch

Bilateral deficit is well documented; however, bilateral deficit is not present in all tasks and is more likely in dynamic activities than isometric activities. No definitive mechanism(s) for bilateral deficit is known but an oft cited mechanism is lower activation of fast twitch motor units. The aim of this study was to produce comparable and consistent one and two legged drop jumps to examine bilateral deficit in elite power athletes and elite endurance athletes. Seven power athletes and seven endurance athletes performed single and double leg drop jumps from a range of heights that equalized loading per leg in terms of: height dropped, energy absorbed, and momentum absorbed. Force and motion data were collected at 800 Hz. Bilateral deficit for jump height, peak concentric force, and peak concentric power were calculated. Power athletes had a significantly greater (P< .05) bilateral deficit for jump height and peak power, possibly due to power athletes having more fast twitch motor units, however, endurance athletes generally had a bilateral surfeit which could confound this inference. Results indicate that equalizing loading by impulse per leg is the most appropriate and that a consistent drop height can be obtained with a short 10 minute coaching session.

scholarly journals Effects of plyometric training on grass surface and concrete surface on jumping performance among volleyball athletes

2018 ◽  
Vol 7 (2) ◽  
Author(s):  
Mohamad Hariff Ramlan ◽  
Patricia Pawa Pitil ◽  
Wan Juliana Emeih Wahed
Keyword(s):  
Vertical Jump ◽  
Surface Group ◽  
Concrete Surface ◽  
Plyometric Training ◽  
Countermovement Jump ◽  
Squat Jump ◽  
Jumping Performance ◽  
Significant Difference ◽  
Post Test ◽  
Stretch Shortening Cycle

The purpose of this study was to compare the effects of 4 weeks plyometric training on grass surface group and concrete surface on jumping performance among volleyball athletes. The vertical jump was evaluated in two types of jump; squat jump (SJ) and countermovement jump (CMJ). The result of this study indicates that the 4 weeks intervention showed a significant improvement in post test on SJ and CMJ (p < 0.05) for both grass surface and concrete surface. However, in comparing the grass surface and concrete surface, there was no significant difference (p > 0.05). These findings suggest that plyometric training on different surfaces may be associated with similar training-induced effects on the neuromuscular factors which are related to the efficiency of the stretch-shortening cycle.

scholarly journals Kinematics of assisted and unassisted plyometric training of vertical jumping and rebounding in youth male football players – A six-week training study

2020 ◽  
Vol 9 (2) ◽  
pp. 57-71
Author(s):  
Christopher L. Bakker ◽  
Matthew F. Watson ◽  
Jeremy A. Moody
Keyword(s):  
Football Players ◽  
Jump Height ◽  
Plyometric Training ◽  
Technical Performance ◽  
Counter Movement Jump ◽  
Vertical Jumping ◽  
Ankle Angle ◽  
Hop Test ◽  
Ground Contact Time ◽  
Main Effects

The purpose of this study was to compare the kinematics of assisted and unassisted plyometric training of vertical jumping and rebounding activities following a six-week training intervention. 13 youth males from a professional football academy completed six weeks of either unassisted (n = 6) or band-assisted (n = 7) plyometric training sessions twice a week during their competitive season. Pre- and post-assessments of counter-movement jump (CMJ) height, 50 cm drop-jump (DJ50) ground contact time (GCT), jump height and reactive strength index (RSI), and submaximal-hopping (SMH) GCT, jump height and RSI were compared. Pre- and post-assessment ankle angle at touch-down (TD), peak flexion (PF) and mid-flight (MF) were also analysed for the submaximal-hop test only. Following training, significant main effects of time were observed for CMJ height, DJ50 GCT and MF ankle angle (p < 0.05) and a significant effect of group was observed for DJ50 RSI (p < 0.05). These results suggest that both unassisted and assisted plyometric training may be useful for enhancing the kinematics and technical performance of plyometric activities in a youth male football population.

Knee Extensor Muscle Strength and Vertical Jumping Performance Characteristics in Pre- and Post-Pubertal Boys

2001 ◽  
Vol 13 (1) ◽  
pp. 60-69 ◽  
Author(s):  
Mati Pääsuke ◽  
Jaan Ereline ◽  
Helena Gapeyeva
Keyword(s):  
Muscle Strength ◽  
Isometric Force ◽  
Knee Extensor ◽  
Peak Torque ◽  
Extensor Muscle ◽  
Performance Characteristics ◽  
Jumping Performance ◽  
Vertical Jumping ◽  
Pubertal Boys ◽  
Knee Extensor Muscle Strength

Knee extensor muscle strength and vertical jumping performance characteristics were compared between 14 pre-pubertal (11-year-old) and post-pubertal (16-year-old) boys. Post-pubertal boys had greater (p < .05) absolute values of maximal isometric force (MF) and rate of force development (RFD), absolute and body mass-related values of isokinetic peak torque of the knee extensor muscles at angular velocities of 60, 180, and 240° · s−1, as well as jumping height in squat, counter-movement, and drop jumps, than pre-pubertal boys. This study indicated an inability to use the positive effect of stretch-shortening cycle to vertical jumping performance in pre- and post-pubertal boys.

Reliability and Validity of Two Measurement Systems in the Quantification of Jump Performance

2014 ◽  
Vol 62 (1) ◽  
Keyword(s):  
Force Plate ◽  
Reliability And Validity ◽  
Performance Testing ◽  
Jump Height ◽  
Jump Performance ◽  
Measurement Systems ◽  
Vertical Jumping ◽  
Training Control ◽  
Age Range ◽  
Squat Jumps

There are different devices on the market for assessing strength and power in vertical jumping as a fundamental requisite of an athlete’s performance. The purpose of this study was to assess the reliability and validity of two instruments measuring force, power, velocity, and jump height in squat jumps. Myotest® (MYO) (Myotest SA, Switzerland) was compared with force plate measurements (Quattro Jump® [QUATTRO], Kistler, Switzerland & SPSport Software, Trins, Austria). Forty-three frontier-guards (age range 25–58 years) performed twice a series of five squat jumps (SJ) simultaneously using MYO device along with QUATTRO force plate. Reliability was analysed using ICC, CV and RMSE. Results for reliability for both devices show good results with ICCs ranging from 0.910 to 0.955, and CVs ranging from 2.33% to 6.59% for discrete outcome variables. The validity of the methods was investigated using the Limits of Agreement (LoA) method. MYO overestimated jump performance compared to QUATTRO with a bias of 4.38 cm (±2.59) for jump height, 1.82 Watt/kg (±4.08) for power, and 0.85 N/kg (±1.24) for force. For velocity the two methods displayed good agreement. In conclusion, based on the variability of the measurements, coaches may use complemental variables in addition to jump data in the realm of performance testing and training control to better understand the performance of their athletes. In addition, on the basis of the results regarding the validity interchangeability of the two systems is limited.

scholarly journals Effect of drop jump technique on the reactive strength index

2016 ◽  
Vol 52 (1) ◽  
pp. 157-164 ◽  
Author(s):  
Artur Struzik ◽  
Grzegorz Juras ◽  
Bogdan Pietraszewski ◽  
Andrzej Rokita
Keyword(s):  
Force Plate ◽  
Jump Height ◽  
Drop Jump ◽  
Plyometric Training ◽  
Strength Index ◽  
Basketball Players ◽  
Male Youth ◽  
Kinematic Data ◽  
Drop Jumps ◽  
Reaction Forces

AbstractThe basic drill of plyometric training aimed at improving lower limb power and jump height is a drop jump. This exercise can be performed using different techniques, which substantially affects jump variables. Therefore, the aim of this study was to compare the values of the reactive strength index (RSI) for countermovement drop jumps (CDJs) and bounce drop jumps (BDJs). The study was carried out in a group of 8 male youth basketball players. The tests were conducted using the AMTI BP600900 force plate to measure ground reaction forces and the Noraxon MyoMotion system to record kinematic data. Each player performed two CDJs and two BDJs from the height of 15, 30, 45 and 60 cm. The RSI was calculated as a ratio of jump height and contact time. Moreover, the RSI was determined for the amortization and take-off phases separately. Significant differences (p < 0.05) between RSI values for CDJs and BDJs were recorded for jumps from 30, 45 and 60 cm. Differences in RSI values for jumps from 15 cm were not significant. Furthermore, CDJ height values were significantly higher (p < 0.05) than the values recorded for BDJs. Times of contact, amortization and take-off during BDJs were significantly shorter (p < 0.05) than the respective values obtained for CDJs. Therefore, the use of the RSI to monitor plyometric training should be based on the drop jump technique that is commonly performed by basketball players.

scholarly journals Bodyweight squats can induce post-activation performance enhancement on jumping performance: a brief report

2020 ◽  
Vol 9 (4) ◽  
pp. 31-36
Author(s):  
Theodoros M Bampouras ◽  
Joseph I Esformes
Keyword(s):  
Body Mass ◽  
Performance Enhancement ◽  
Team Sports ◽  
Force Generation ◽  
Jump Height ◽  
Power Performance ◽  
Countermovement Jump ◽  
Jumping Performance ◽  
Sufficient Stimulus

Post-activation potentiation enhancement (PAPE) refers to increased force generation following a muscular conditioning pre-activity that acutely enhances subsequent strength and power performance. Athlete apprehension to use heavy weights (i.e. >80%1RM) immediately before a competition or inability to use weights before the performance (e.g. due to regulations) prevent materialising the benefits of PAPE. Therefore, this study examined whether PAPE can be induced with bodyweight squats. Sixteen healthy, team sports players (male: 10, female: 6, mean ± SD: age 22.2 ± 3.0 years, height 1.67 ± 0.08 m, body mass 70.2 ± 8.2 kg) performed three sets of ten repetitions of bodyweight squats with 30 seconds recovery between each set. A countermovement jump was performed 5 minutes before, 2 and 4 minutes after the squat sets and jump height was calculated. The results showed existence of PAPE with the jump height increasing at both 2 (30.8 ± 5.6 cm, p = 0.045, g = 0.21) and 4 (30.8 ± 6.1 cm, p = 0.037, g = 0.20) minutes, compared to baseline (29.5 ± 6.4 cm). This is the first study to use bodyweight squats rather than loaded squats. Our findings indicate that three sets of ten repetitions of squats using bodyweight only can be a sufficient stimulus to induce PAPE.

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