Influence of leg stiffness and its effect on myodynamic jumping performance

Arampatzis, Adamantios; Schade, Falk; Walsh, Mark; Brüggemann, Gert–Peter

doi:10.1016/s1050-6411(01)00009-8

Cited by 243 publications

(264 citation statements)

References 41 publications

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“…This presumption regarding the existence of an appropriate (desirable) leg stiffness that will allow for the maximum performance has previously been made by other authors [3,12,17]. However, this thesis has not been unequivocally supported by the scientific evidence.…”

Section: Discussionmentioning

confidence: 87%

“…Also, Rabita et al [13] reported a statistically significant (negative) relationship between the leg stiffness and the height of maximal hopping in elite long and triple jumpers. Arampatzis et al [3] showed the maximum DJ height that can be achieved for various leg stiffness values, which was affected by a reduction in the take-off time. Furthermore, the value for leg stiffness decreased with the increase in the initial drop height that was used (20, 40 or 60 cm).…”

Section: Discussionmentioning

confidence: 99%

“…However, this thesis has not been unequivocally supported by the scientific evidence. Arampatzis et al [3] claimed that an "optimal" level of leg stiffness is needed for the maximisation of the values of mechanical power during a DJ. If the assumption is made that there is a most appropriate level of leg stiffness, the statistically significant negative relationship between leg stiffness and the changes in gravitational potential energy in the countermovement phase found in our study would suggest that there is a rapid decline in the capability for the accumulation of potential elastic energy after it exceeds the most appropriate value for leg stiffness in the countermovement phase.…”

Section: Discussionmentioning

confidence: 99%

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Leg stiffness and potential energy in the countermovement phase and the CMJ jump height

Struzik

Zawadzki

Rokita

2016

Biomedical Human Kinetics

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SummaryStudy aim: The elastic potential energy accumulated in the musculotendinous units during the countermovement phase of a jump adds up to the energy supplied by the contracting muscles used in the take-off phase. Consequently, the total mechanical energy used during the jump may reach higher values. Stiffness represents a quantitative measure of a body's elastic properties. Therefore, the aim of this study was to establish the relationship between leg stiffness and the countermovement jump height. Material and methods: 24 basketball players from the II Division participated in the study. The measurements employed a Kistler force plate and a BTS SMART system for the motion analysis. Each study participant performed three countermovement jumps with arm swings. Leg stiffness in the countermovement phase was determined from the slope of the ground reaction forces curve, with respect to the coexisting height of the greater trochanter of the femur. The decline in the gravitational potential energy of the centre of mass during the countermovement phase is partially accumulated in the form of potential elastic energy through the stretched musculotendinous units, and consequently contributes to the jump height. Results: We found a statistically significant relationship between leg stiffness and a decline in the potential energy during the countermovement phase. The relationship between leg stiffness and the jump height was not statistically significant. Conclusions:The distribution of measurements may suggest the presence of local maximums, with their locations representing a value of leg stiffness that allows for high values of changes in the potential energy and the jump height to be obtained. Therefore, the presence of a specific value for leg stiffness that would be the most favourable for the accumulation of potential elastic energy is likely. However, this study cannot unequivocally confirm this fact, and the confirmation of the above statement will require further experimentation.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Leg stiffness and potential energy in the countermovement phase and the CMJ jump height

Struzik

Zawadzki

Rokita

2016

Biomedical Human Kinetics

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“…The SSC can be defined as an active stretch of a muscle (eccentric contraction), which is immediately followed by a shortening contraction of that same muscle (concentric contraction) thereby causing an enhancement of force development (6). The SSC is crucially important in the performance of many strength, locomotor, and sports activities, and the control of leg-spring and joint stiffness is related to the performance of SSC activities (2,3,22).…”

Section: Introductionmentioning

confidence: 99%

“…Previous research on the effects of fatigue on SSC function has focussed primarily on longer term effects of fatigue and recovery during several days after exhaustive exercise (3)(4)(5)33). These and other research studies examining SSC fatigue in long distance running (29), have indicated that longer duration of fatiguing exercise often results in a reversible muscle damage process, which has considerable influence on muscle mechanisms, stretch reflex sensitivity (29), and joint and muscle stiffness (21).…”

Section: Introductionmentioning

confidence: 99%

An Investigation Into the Recovery Process of a Maximum Stretch-Shortening Cycle Fatigue Protocol on Drop and Rebound Jumps

Comyns

Harrison

Hennessy

2011

Journal of Strength and Conditioning Research

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Comyns, TM, Harrison, AJ, and Hennessy, LK. An investigation into the recovery process of a maximum stretch-shortening cycle fatigue protocol on drop and rebound jumps. J Strength Cond Res 25(X): 000-000, 2011-The aim of this study was to investigate the recovery process of a maximal stretch-shortening cycle (SSC) fatigue workout on the biomechanical performance of drop jump (DJ) and rebound jump (RBJ) on a force sledge apparatus. Thirteen elite level rugby players performed sledge DJs and RBJs before and 15, 45, 120, and 300 seconds after a maximum SSC fatigue workout. Flight time, ground contact time (CT), peak force, reactive strength index (RSI), and leg-spring stiffness were the dependent variables. The DJ results showed that after 15 seconds recovery, there was a significant reduction in flight time (FT) (p , 0.01), RSI (p , 0.001), peak force (p , 0.01), and leg stiffness (p , 0.001). Similarly, the results for the RBJ indicated that the fatigue workout significantly reduced FT (p , 0.001), peak force (p , 0.01), RSI (p , 0.01), and significantly increased CT (p , 0.05) at the 15-second interval. The results also indicated a potentiation effect at the 300-second interval because of significant increases in RSI, peak force, and leg stiffness (p , 0.05) for the RBJ and significant increases in RSI (p , 0.05), peak force, and leg stiffness (p , 0.01) and a significant decrease in ground CT (p , 0.05) for the DJ. A maximal SSC fatigue workout had both an inhibiting and potentiating effect on DJ and RBJ performance depending on the recovery interval. The efficiency of the SSC function was reduced immediately after the cessation of the fatigue workout. A potentiation effect was evident for both jumps 300 seconds postfatigue.

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