Countermovement-Jump-Phase Characteristics of Senior and Academy Rugby League Players

McMahon, John J.; Murphy, Shannon; Rej, Sophie J. E.; Comfort, Paul

doi:10.1123/ijspp.2016-0467

Cited by 99 publications

(144 citation statements)

References 21 publications

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“…This led to greater eccentric forces and attainment of peak force earlier in the jump, with no change in its magnitude. These changes are similar to the distinguishing jump characteristics of higher‐ versus lower‐level strength‐power athletes . While there were little further changes to the second half of the jump (active lengthening and concentric phases) at post‐test in this group, there was a continued improvement in unweighting (ie a greater reduction in force upon initiation of the countermovement, prior to active lengthening) at the beginning of the jump.…”

Section: Discussionsupporting

confidence: 64%

“…These changes are similar to the distinguishing jump characteristics of higher-versus lower-level strength-power athletes. 37 While there were little further changes to the second half of the jump (active lengthening and concentric phases) at post-test in this group, there was a continued improvement in unweighting (ie a greater reduction in force upon initiation of the countermovement, prior to active lengthening) at the beginning of the jump. Weaker participants achieved improvements in similar phases of the jump; however, the epochs were considerably smaller.…”

Section: Jump Mechanicsmentioning

confidence: 72%

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The impact of strength level on adaptations to combined weightlifting, plyometric, and ballistic training

James

Haff

Kelly

et al. 2018

Scandinavian Med Sci Sports

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The purpose of this investigation was to determine whether the magnitude of adaptation to integrated ballistic training is influenced by initial strength level. Such information is needed to inform resistance training guidelines for both higher- and lower-level athlete populations. To this end, two groups of distinctly different strength levels (stronger: one-repetition-maximum (1RM) squat = 2.01 ± 0.15 kg·BM ; weaker: 1.20 ± 0.20 kg·BM ) completed 10 weeks of resistance training incorporating weightlifting derivatives, plyometric actions, and ballistic exercises. Testing occurred at pre-, mid-, and post-training. Measures included variables derived from the incremental-load jump squat and the 1RM squat, alongside muscle activity (electromyography), and jump mechanics (force-time comparisons throughout the entire movement). The primary outcome variable was peak velocity derived from the unloaded jump squat. It was revealed that the stronger group displayed a greater (P = .05) change in peak velocity at mid-test (baseline: 2.65 ± 0.10 m/s, mid-test: 2.80 ± 0.17 m/s) but not post-test (2.85 ± 0.18 m/s) when compared to the weaker participants (baseline 2.43 ± 0.09, mid-test. 2.47 ± 0.11, post-test: 2.61 ± 0.10 m/s). Different changes occurred between groups in the force-velocity relationship (P = .001-.04) and jump mechanics (P ≤ .05), while only the stronger group displayed increases in muscle activation (P = .05). In conclusion, the magnitude of improvement in peak velocity was significantly influenced by pre-existing strength level in the early stage of training. Changes in the mechanisms underpinning performance were less distinct.

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Section: Discussionsupporting

confidence: 64%

Section: Jump Mechanicsmentioning

confidence: 72%

The impact of strength level on adaptations to combined weightlifting, plyometric, and ballistic training

James

Haff

Kelly

et al. 2018

Scandinavian Med Sci Sports

View full text Add to dashboard Cite

show abstract

“…Jump height was determined as the center of mass displacement, calculated from the force-time record. Center of mass displacement was determined by double integration of the vertical force data (28) and the vertical force-time data were exported as text files and analyzed using a customized Microsoft Excel spreadsheet. The onset of movement for each CMJ trial was determined according to Owen et al (36).…”

Section: Methodsmentioning

confidence: 99%

Effects of Two Different Tapering Protocols on Fitness and Physical Match Performance in Elite Junior Soccer Players

Krespi

Sporiš

Trajković

2020

Journal of Strength and Conditioning Research

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Krespi, M, Sporiš, G, and Trajković, N. Effects of two different tapering protocols on fitness and physical match performance in elite junior soccer players. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to determine the effects of 2 different tapering protocols on fitness and physical match performance in elite junior soccer players. One-hundred fifty-eight elite junior soccer players (mean age: 17.1 6 0.79 years; mean height: 177.9 6 6.64 cm; mean body mass: 71.3 6 7.96 kg; and mean body mass index: 22.5 6 1.66 kg$m 22) were randomly assigned to 2 groups: an exponential (n = 79) and a linear tapering (n = 79) group. Training sessions were conducted 3 times per week for 8 weeks. After 4 weeks of training and 4 weeks of tapering, participants were assessed in terms of body composition, physical fitness, and distance covered within a match. Both groups showed similar changes for body composition. The exponential group showed better improvement than the linear group in the 5-and 30-m sprints, countermovement jump, and V _ O 2 max (p , 0.05). The exponential tapering group had larger changes (p , 0.05) than the linear group in medium running (8-13 km$h 21) (6%; effect size = 0.26 compared with 5.5%; effect size = 0.22) and sprinting (.18 km$h 21) (26%; effect size = 0.72 compared to 21.7%; effect size = 0.60). The results show that exponential tapering produced better effects on speed, power, and endurance abilities than the linear protocol. Our results confirmed the reports of others that suggest that volume is the optimal variable to manipulate while maintaining both the intensity and the frequency of sessions.

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“…Following a dynamic warm-up for 15 min, subjects performed three CMJs (interspersed by 3 min intervals of rest to prevent fatigue) to a self-selected depth (McMahon, Murphy, Rej, & Comfort, 2017;. Subjects were instructed to perform the CMJs as fast and as high as possible, whilst keeping their arms on their hips.…”

Section: Instruments and Proceduresmentioning

confidence: 99%

Relationships between force-time curve variables and jump height during countermovement jumps in young elite volleyball players

Sarvestan¹,

Cheraghi²,

Sebyani³

et al. 2018

Acta Gymnica

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Countermovement-Jump-Phase Characteristics of Senior and Academy Rugby League Players

Cited by 99 publications

References 21 publications

The impact of strength level on adaptations to combined weightlifting, plyometric, and ballistic training

The impact of strength level on adaptations to combined weightlifting, plyometric, and ballistic training

Effects of Two Different Tapering Protocols on Fitness and Physical Match Performance in Elite Junior Soccer Players

Relationships between force-time curve variables and jump height during countermovement jumps in young elite volleyball players

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