scholarly journals Musculotendinous Stiffness of Triceps Surae, Maximal Rate of Force Development, and Vertical Jump Performance

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Tarak Driss ◽  
Daniel Lambertz ◽  
Majdi Rouis ◽  
Hamdi Jaafar ◽  
Henry Vandewalle
Keyword(s):  
Vertical Jump ◽  
Triceps Surae ◽  
Maximal Rate ◽  
Plantar Flexor ◽  
Jump Performance ◽  
Force Development ◽  
Rate Of Torque Development ◽  
And Performance ◽  
Torque Development ◽  
Musculotendinous Stiffness

The relationships between ankle plantar flexor musculotendinous stiffness (MTS) and performance in a countermovement vertical jump (CMJ) and maximal rate of torque development (MRTD) were studied in 27 active men. MTS was studied by means of quick releases at 20 (S0.2), 40 (S0.4), 60 (S0.6), and 80% (S0.8) of maximal voluntary torque (TMVC). CMJ was not correlated with strength indices but was positively correlated with MRTD/BM,S0.4/BM. The slopeα2and interceptβ2of the torque-stiffness relationships from 40 to 80%TMVCwere correlated negatively (α2) and positively (β2) with CMJ. The different stiffness indices were not correlated with MRTD. The prediction of CMJ was improved by the introduction of MRTD in multiple regressions between CMJ and stiffness. CMJ was also negatively correlated with indices of curvature of the torque-stiffness relationship. The subjects were subdivided in 3 groups in function of CMJ (groups H, M, and L for high, medium, and low performers, resp.). There was a downward curvature of the torque-stiffness relationship at high torques in group H or M and the torque-stiffness regression was linear in group L only. These results suggested that torque-stiffness relationships with a plateau at high torques are more frequent in the best jumpers.

Barbell Deadlift Training Increases the Rate of Torque Development and Vertical Jump Performance in Novices

2015 ◽  
Vol 29 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Brennan J. Thompson ◽  
Matt S. Stock ◽  
JoCarol E. Shields ◽  
Micheal J. Luera ◽  
Ibrahim K. Munayer ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Jump Performance ◽  
Rate Of Torque Development ◽  
Torque Development

scholarly journals Isometric and dynamic strength and neuromuscular attributes as predictors of vertical jump performance in 11- to 13-year-old male athletes

2017 ◽  
Vol 42 (9) ◽  
pp. 924-930 ◽  
Author(s):  
Brandon John McKinlay ◽  
Phillip J. Wallace ◽  
Raffy Dotan ◽  
Devon Long ◽  
Craig Tokuno ◽  
...  
Keyword(s):  
Vastus Lateralis ◽  
Peak Torque ◽  
Soccer Players ◽  
Neural Activation ◽  
Male Athletes ◽  
Neuromuscular Activation ◽  
Jump Performance ◽  
Rate Of Torque Development ◽  
Dynamic Contractions ◽  
Torque Development

In explosive contractions, neural activation is a major factor in determining the rate of torque development, while the latter is an important determinant of jump performance. However, the contribution of neuromuscular activation and rate of torque development to jump performance in children and youth is unclear. The purpose of this study was to examine the relationships between the rate of neuromuscular activation, peak torque, rate of torque development, and jump performance in young male athletes. Forty-one 12.5 ± 0.5-year-old male soccer players completed explosive, unilateral isometric and dynamic (240°/s) knee extensions (Biodex System III), as well as countermovement-, squat-, and drop-jumps. Peak torque (pT), peak rate of torque development (pRTD), and rate of vastus lateralis activation (Q30) during the isometric and dynamic contractions were examined in relation to attained jump heights. Isometric pT and pRTD were strongly correlated (r = 0.71) but not related to jump performance. Dynamic pT and pRTD, normalized to body mass, were significantly related to jump height in all 3 jumps (r = 0.38–0.66, p < 0.05). Dynamic normalized, but not absolute pRTD, was significantly related to Q30 (r = 0.35, p < 0.05). In young soccer players, neuromuscular activation and rate of torque development in dynamic contractions are related to jump performance, while isometric contractions are not. These findings have implications in the choice of training and assessment methods for young athletes.

Kinetic and Electromyographic Subphase Characteristics With Relation to Countermovement Vertical Jump Performance

2018 ◽  
Vol 34 (4) ◽  
pp. 291-297 ◽  
Author(s):  
John R. Harry ◽  
Max R. Paquette ◽  
Brian K. Schilling ◽  
Leland A. Barker ◽  
C. Roger James ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Effect Sizes ◽  
Jump Height ◽  
Strength Index ◽  
Jump Performance ◽  
Force Development ◽  
The Poor ◽  
Large Jump ◽  
Jump Time ◽  
Vertical Jumps

This study sought to identify kinetic and electromyographic subphase characteristics distinguishing good from poor jumpers during countermovement vertical jumps (CMVJs), as defined by the reactive strength index (RSI, CMVJ displacement divided by jump time; cutoff = 0.46 m·s−1). A total of 15 men (1.8 [0.6] m, 84.5 [8.5] kg, 24 [2] y) were stratified by RSI into good (n = 6; RSI = 0.57 [0.07] m·s−1) and poor (n = 9; RSI = 0.39 [0.06] m·s−1) performance groups. The following variables were compared between groups using independentttests (α = .05) and Cohen’sdeffect sizes (d ≥ 0.8, large): jump height, propulsive impulse, eccentric rate of force development, and jump time, unloading, eccentric, and concentric subphase times, and average electromyographic amplitudes of 8 lower extremity muscles. Compared with the poor RSI group, the good RSI group exhibited a greater, though not statistically different CMVJ displacement (d = 1.07,P = .06). In addition, the good RSI group exhibited a significantly greater propulsive impulse (P = .04,d = 1.27) and a significantly more rapid unloading subphase (P = .04,d = 1.08). No other significant or noteworthy differences were detected. Enhanced RSI appears related to a quicker unloading phase, allowing a greater portion of the total jumping phase to be utilized generating positive net force. Poor jumpers should aim to use unloading strategies that emphasize quickness to enhance RSI during CMVJ.

The Role of Rate of Force Development on Vertical Jump Performance

2011 ◽  
Vol 25 (2) ◽  
pp. 379-385 ◽  
Author(s):  
Christopher P McLellan ◽  
Dale I Lovell ◽  
Gregory C Gass
Keyword(s):  
Vertical Jump ◽  
Rate Of Force Development ◽  
Jump Performance ◽  
Force Development

scholarly journals Effect of massage and pseudo massage on acute performance and self-perceived recovery: a study placebo-controlled

1989 ◽  
Author(s):  
Anderson Augusto Andreossi ◽  
◽  
Paulo Henrique Marchetti ◽  
André Domingos Lass ◽  
Gerson dos Santos Leite ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Plantar Flexor ◽  
Jump Height ◽  
Total Quality ◽  
Experimental Conditions ◽  
Jump Performance ◽  
Flexor Muscles ◽  
Vertical Jumps ◽  
Plantar Flexor Muscles

The aim of this study was to verify the effect of massage or pseudo massage on vertical jump performance. Fifteen participants were randomly subjected to three experimental conditions: massage, pseudo massage and rest. The massage condition required three unipodal vertical jumps followed by two minutes of manual massage on plantar flexor muscles and, before performing another three jumps, the Total Quality Recover Scale (TQR) was applied. The two following conditions were structured with the same procedures, although participants were submitted either at pseudo massage (single-blinded) or two minutes of rest. Results showed no statistical differences on jump height between pre and post analysis nor between experimental conditions (massage 18.7 ± 4.1 vs 18.2 ± 4.1; pseudo massage 19.1 ± 4.0 vs 8.3 ± 3.8; rest 19.0 ± 4.0 vs 18.7 ± 3.9 cm). There were also no statistical differences in the TQR results between experimental conditions (massage 16.2 ± 4.3; pseudo massage 16.4 ± 3.9; rest 15.9 ± 2.6 ua). Both massage and pseudo massage did not affect performance on vertical jump and TQR.

Age-related decline in rate of torque development is accompanied by lower maximal motor unit discharge frequency during fast contractions

2008 ◽  
Vol 104 (3) ◽  
pp. 739-746 ◽  
Author(s):  
Malgorzata Klass ◽  
Stéphane Baudry ◽  
Jacques Duchateau
Keyword(s):  
Motor Unit ◽  
Discharge Frequency ◽  
Maximal Rate ◽  
Unit Discharge ◽  
Rate Of Torque Development ◽  
Age Related ◽  
Motor Unit Discharge ◽  
Integrated Emg ◽  
Voluntary Contractions ◽  
Torque Development

The aim of this study was to investigate the association between the rate of torque development and maximal motor unit discharge frequency in young and elderly adults as they performed rapid submaximal contractions with the ankle dorsiflexors. Recordings were obtained of the torque exerted by the dorsiflexors during the isometric contractions and the surface and intramuscular electromyograms (EMGs) from the tibialis anterior. The maximal rate of torque development and integrated EMG (percentage of total EMG burst) at peak rate of torque development during fast contractions were lower in elderly than young adults by 48% ( P < 0.05) and 16.5% ( P < 0.05), respectively. The young adults, but not the elderly adults, exhibited a positive association ( r2 = 0.33; P < 0.01) between the integrated EMG computed up to the peak rate of torque development and the maximal rate of torque development achieved during the fast contractions. These age-related changes during fast voluntary contractions were accompanied by a decline ( P < 0.001) in motor unit discharge frequency (19, 28, and 34% for first 3 interspike intervals, respectively) and in the percentage of units (45%; P < 0.05) that exhibited double discharges (doublets) at brief intervals (<5 ms). Because aging decreased the maximal rate of torque development of fast voluntary contractions to a greater extent (∼10%) than that of an electrically evoked twitch, collectively the results indicate that the age-related decline in maximal motor unit discharge frequency likely limit, in addition to the slowing of muscle contractile properties, the performance of fast voluntary contractions.

Acute effects of local vibration stretching on ankle range of motion, vertical jump performance and dynamic balance after landing

2020 ◽  
pp. 1-7
Author(s):  
Noriaki Maeda ◽  
Yukio Urabe ◽  
Somu Kotoshiba ◽  
Makoto Komiya ◽  
Masanori Morikawa ◽  
...  
Keyword(s):  
Dynamic Balance ◽  
Vertical Jump ◽  
Stability Index ◽  
Body Part ◽  
Ankle Dorsiflexion ◽  
Static Stretching ◽  
Local Vibration ◽  
Jump Performance ◽  
Warm Up ◽  
And Performance

BACKGROUND: Local vibration (LV) used as part of the warm-up can stimulate a specific body part and muscle group, potentially increasing muscle flexibility and performance. However, the effect of its combination with static stretching (SS) has not been thoroughly examined. OBJECTIVE: To elucidate the acute effectiveness of combining LV and SS (V+S) on the ROM of ankle dorsiflexion, squat jump, counter-movement jump (CMJ) and the dynamic postural stability index (DPSI). METHODS: Fifteen healthy men who were regularly involved in recreational sports participated in this study. Static Stretching, V+S, and non-stretching condition (control) were assigned randomly and the intervention period for each condition was five minutes. RESULTS: The dorsiflexion improved significantly in SS and V+S compared to the control. The CMJ height decreased significantly following SS compared to V+S and control. CONCLUSIONS: This study suggests that V+S improves ankle dorsiflexion ROM without compromising jump performance. Local vibration device could be an effective element in warming up but further research is warranted.

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