Analysis of damped tissue vibrations in time-frequency space: A wavelet-based approach

Enders, Hendrik; Tscharner, Vinzenz von; Nigg, Benno M.

doi:10.1016/j.jbiomech.2012.08.027

Cited by 31 publications

(32 citation statements)

References 19 publications

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“…Furthermore, variable knee stiffness due to gradually increasing muscle activation would lead to the soft tissue compartments around the knee 276 vibrating with an increasing rather than a constant frequency. In fact, variable soft-tissue vibration frequencies were recently reported for running by Enders et al (2012).…”

Section: Discussionmentioning

confidence: 99%

Heel-strike in walking: Assessment of potential sources of intra- and inter-subject variability in the activation patterns of muscles stabilizing the knee joint

Huber¹,

Federolf²,

Nüesch³

et al. 2013

Journal of Biomechanics

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Section: Discussionmentioning

confidence: 99%

Heel-strike in walking: Assessment of potential sources of intra- and inter-subject variability in the activation patterns of muscles stabilizing the knee joint

Huber¹,

Federolf²,

Nüesch³

et al. 2013

Journal of Biomechanics

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“…EMG signals were decomposed into timefrequency space using a filter bank of non-linearly scaled wavelets (Von Tscharner, 2000). The result of the wavelet transform is a time-dependent intensity pattern for each frequency band (wavelet) where the sum of the power of all frequency bands conserves the entire power of the signal (Enders, Von Tscharner, & Nigg, 2012;Von Tscharner, 2000). In this study, EMG signals were separated into ten frequency bands (19-395 Hz) and analysed for a time window of 100 ms prior to heel strike to 200 ms post heel strike.…”

Section: Discussionmentioning

confidence: 99%

Ankle muscle strength influence on muscle activation during dynamic and static ankle training modalities

Lucas-Cuevas

Baltich

Enders

et al. 2015

Journal of Sports Sciences

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Muscle weakness is considered a risk factor for ankle injury. Balance training and barefoot running have been used in an attempt to strengthen the muscles crossing the ankle. It is expected that training tasks that successfully strengthen the ankle would elicit increased muscular activity. However, it is unknown how an individual's ankle strength will influence the muscle activity used during a given task. Twenty-six participants performed dynamic (shod, barefoot running) and static tasks (squat on ground, squat on ®Bosu Ball) believed to strengthen the muscles surrounding the ankle. Electromyographic signals of the tibialis anterior, peroneus longus, gastrocnemius lateralis (GL) and gastrocnemius medialis (GM) were recorded and analysed using a non-linearly scaled wavelet analysis. Participants were divided into a strong group and a weak group according to their isometric plantar-flexion torque. The weak group required more relative GL and GM muscle activity during each training task compared to the strong group. No difference was observed between shod and barefoot running. There was a significant effect of training task on muscle activation level for the weak group. Differences in ankle strength had a significant impact on muscle activation.

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“…One aspect to investigate local energy aspects during locomotion is the study of soft tissue vibrations (Nigg 1997, Wakeling and Nigg 2001a, Wakeling et al 2003, Enders et al 2012b. Soft tissue vibrations during locomotion are initiated through the collision of the foot with the ground.…”

Section: Barefoot Running and Performancementioning

confidence: 99%

“…As a result a shock wave travels up the body from the feet to the head (Ratcliffe and Halt 1997). The vibrations of soft tissue compartments due to impact are typically heavily damped (Nigg 1997, Wakeling et al 2003, Enders et al 2012b. A variety of studies investigating soft tissue vibrations as well as muscular activity suggest that muscle activity contributes to the damping of these impact related soft tissue vibrations (Wakeling et al 2001, Wakeling et al 2002, Wakeling et al 2003.…”

Section: Barefoot Running and Performancementioning

confidence: 99%

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Barefoot running – some critical considerations

Nigg

Enders

2013

Footwear Science

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The purpose of this paper is to discuss critically selected aspects of the current discussion on barefoot running, specifically differences between barefoot and shod running in kinematics and kinetics, training effects, performance and economy and injury frequency.The kinematics and kinetics depend on many different factors, including surface, shoe, running speed and subject. In general, hard surfaces are associated with a flatter foot landing. However, the inter-individual differences are substantial and it is not appropriate to associate barefoot running with toe landing and shod running with heel landing.The training effects for the small muscles crossing the ankle joint are small during running and substantially higher for movements such as side shuffling, independent of footwear.The additional mass added to the foot by the shoe seems not to have a negative effect on performance until at a 'threshold mass' of about 200 to 250 g. The additional work due to the damping of vibrations of soft tissue compartments seems not to depend primarily on the footwear but rather on the individual comfort of the runner.To the knowledge of the authors, there is no conclusive evidence that barefoot running has more, equal or less injuries than shod running. From a biomechanical point of view, injuries are a result of overloading of a given structure. The internal active forces in the lower extremities are about 500% higher than the internal impact forces. Consequently, these impact forces may not be the major reason for potential running injuries.

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Analysis of damped tissue vibrations in time-frequency space: A wavelet-based approach

Cited by 31 publications

References 19 publications

Heel-strike in walking: Assessment of potential sources of intra- and inter-subject variability in the activation patterns of muscles stabilizing the knee joint

Heel-strike in walking: Assessment of potential sources of intra- and inter-subject variability in the activation patterns of muscles stabilizing the knee joint

Ankle muscle strength influence on muscle activation during dynamic and static ankle training modalities

Barefoot running – some critical considerations

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