Browsing Brage NIH by Author "Raffalt, Peter Christian"
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Comparative analysis of power, work and muscle activation during weight-stack and iso-inertial flywheel resistance exercise in young adults with cerebral palsy
von Walden, Ferdinand; Hjalmarsson, Emma; Reimeringer, Mikael; Kvist, Ola; Raffalt, Peter Christian; Pontén, Eva; Fernandez-Gonzalo, Rodrigo (Peer reviewed; Journal article, 2020)Introduction: The development of efficient resistance exercise protocols to counteract muscle dysfunction in cerebral palsy is warranted. Whether individuals with cerebral palsy are able to perform iso-inertial resistance ... -
Dynamics of Postural Control in Elite Sport Rifle Shooters
Raffalt, Peter Christian; Marker, Ida Fillingsnes; Adler, Andreas; Alkjaer, Tine (Peer reviewed; Journal article, 2020)Thirteen shooters and eleven non-shooters completed two-legged and single-legged stance on a force platform. The dynamics of the center of pressure trajectory was assessed using sample entropy, correlation dimension and ... -
Entropy Analysis in Gait Research: Methodological Considerations and Recommendations
Yentes, Jennifer M.; Raffalt, Peter Christian (Peer reviewed; Journal article, 2021)The usage of entropy analysis in gait research has grown considerably the last two decades. The present paper reviews the application of different entropy analyses in gait research and provides recommendations for future ... -
Filtering affects the calculation of the largest Lyapunov exponent
Raffalt, Peter Christian; Senderling, Benjamin; Stergiou, Nicholas (Peer reviewed; Journal article, 2020)The calculation of the largest Lyapunov exponent (LyE) requires the reconstruction of the time series in an N-dimensional state space. For this, the time delay (Tau) and embedding dimension (EmD) are estimated using the ... -
Inter-limb coupling in individuals with transtibial amputation during bilateral stance is direction dependent
Raffalt, Peter Christian; Kent, Jenny A.; Stergiou, Nicholas (Peer reviewed; Journal article, 2021)We investigated the control of upright standing in individuals with unilateral transtibial amputation (TTA) by assessing the inter-limb coupling and the coupling between the center of pressure beneath both limbs combined ... -
On the application of entropic half-life and statistical persistence decay for quantification of time dependency in human gait
Raffalt, Peter Christian; Yentes, Jennifer M. (Peer reviewed; Journal article, 2020)Entropic half-life (ENT½) and statistical persistence decay (SPD) was recently introduced as measures of time dependency in stride time intervals during walking. The present study investigated the effect of data length on ... -
The temporal pattern and the probability distribution of visual cueing can alter the structure of stride-to-stride variability
Raffalt, Peter Christian; Stergiou, Nicholas; Sommerfeld, Joel H.; Likens, Aaron D. (Peer reviewed; Journal article, 2021)The structure of the stride-to-stride time intervals during paced walking can be altered by the temporal pattern of the pacing cues, however, it is unknown if an altered probability distribution of these cues could also ... -
To walk or to run - a question of movement attractor stability
Raffalt, Peter Christian; Kent, Jenny A.; Wurdeman, Shane R.; Stergiou, Nicholas (Peer reviewed; Journal article, 2020)During locomotion, humans change gait mode between walking and running as locomotion speed is either increased or decreased. Dynamical systems theory predicts that the self-organization of coordinated motor behaviors ...