Blar i Brage NIH på forfatter "Federolf, Peter"
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A holistic approach to study the temporal variability in gait
Federolf, Peter; Tecante, Karelia; Nigg, Benno (Journal article; Peer reviewed, 2012-04)Movement variability has become an important field of research and has been studied to gain a better understanding of the neuro-muscular control of human movements. In addition to studies investigating “amplitude variability” ... -
A novel approach to solve the “Missing marker problem” in marker-based motion analysis that exploits the segment coordination patterns in multi-limb motion data
Federolf, Peter (Journal article; Peer reviewed, 2013-10-30)Marker-based human motion analysis is an important tool in clinical research and in many practical applications. Missing marker information caused by occlusions or a marker falling off is a common problem impairing data ... -
A novel approach to study human posture control: “Principal movements” obtained from a principal component analysis of kinematic marker data
Federolf, Peter (Journal article; Peer reviewed, 2016-02-08)Human upright posture is maintained by postural movements, which can be quantified by “principal movements” (PMs) obtained through a principal component analysis (PCA) of kinematic marker data. The current study expands ... -
Analysis of the multi-segmental postural movement strategies utilized in bipedal, tandem and one-leg stance as quantified by a principal component decomposition of marker coordinates
Federolf, Peter; Roos, Lillian; Nigg, Benno (Journal article; Peer reviewed, 2013-10-18)Postural control research describes ankle-, hip-, or multi-joint strategies as mechanisms to control upright posture. The objectives of this study were, first, development of an analysis technique facilitating a direct ... -
Application of principal component analysis in clinical gait research: Identification of systematic differences between healthy and medial knee-osteoarthritic gait
Federolf, Peter; Boyer, K. A.; Andriacchi, T. P. (Journal article; Peer reviewed, 2013-09)For a successful completion of a movement task the motor control system has to observe a multitude of internal constraints that govern the coordination of its segments. The purpose of this study was to apply principal ... -
Heel-strike in walking: Assessment of potential sources of intra- and inter-subject variability in the activation patterns of muscles stabilizing the knee joint
Huber, Cora; Federolf, Peter; Nüesch, Corina; Cattin, Philippe C.; Friederich, Niklaus F.; von Tscharner, Vinzenz (Journal article; Peer reviewed, 2013-04-26)The electromyographic (EMG) signal is known to show large intra-subject and inter-subject variability. Adaptation to, and preparation for, the heel-strike event have been hypothesized to be major sources of EMG variability ... -
Kinematic adaptations to a variable stiffness shoe: mechanisms for reducing joint loading
Boyer, K.; Federolf, Peter; Lin, C.; Nigg, Benno; Andriacchi, T. P. (Journal article; Peer reviewed, 2012)A recently described variable-stiffness shoe has been shown to reduce the adduction moment and pain in patients with medial-compartment knee osteoarthritis. The mechanism associated with how this device modifies overall ... -
Marker-based classification of young–elderly gait pattern differences via direct PCA feature extraction and SVMs
Eskofier, Bjørn M.; Federolf, Peter; Kugler, Patrick F.; Benno, Nigg (Journal article; Peer reviewed, 2011-12-08)The classification of gait patterns has great potential as a diagnostic tool, for example, for the diagnosis of injury or to identify at-risk gait in the elderly. The purpose of the paper is to present a method for classifying ... -
Muscle activation characteristics in cross-country skiers with a history of anterior compartment pain
Federolf, Peter; Bakker, Emily (Journal article; Peer reviewed, 2012-08-01)A large proportion of elite cross-country skiers suffer from chronic anterior compartment syndrome (CACS). This study used surface electromyograms (EMGs) to investigate whether differences existed in the activation ... -
Predicting missing marker trajectories in human motion data using marker intercorrelations
Gløersen, Øyvind Nøstdahl; Federolf, Peter (Journal article; Peer reviewed, 2016-03-31)Missing information in motion capture data caused by occlusion or detachment of markers is a common problem that is difficult to avoid entirely. The aim of this study was to develop and test an algorithm for reconstruction ... -
Quantifying instantaneous performance in alpine ski racing
Federolf, Peter (Journal article; Peer reviewed, 2012-05-24)Alpine ski racing is a popular sport in many countries and a lot of research has gone into optimising athlete performance. Two factors influence athlete performance in a ski race: speed and the chosen path between the ... -
Shoe midsole hardness, sex and age effects on lower extremity kinematics during running
Nigg, Benno; Baltich, Jennifer; Maurer, Christian; Federolf, Peter (Journal article; Peer reviewed, 2012-06)Previous studies investigating the effects of shoe midsole hardness on running kinematics have often used male subjects from within a narrow age range. It is unknown whether shoe midsole hardness has the same kinematic ... -
The effect of footwear on postural control in bipedal quiet stance
Federolf, Peter; Roos, Lilian; Nigg, Benno (Journal article; Peer reviewed, 2012)Assessments of the occurrence of falls in elderly populations reported an increased risk when barefoot as compared to shod conditions, suggesting that footwear has an effect on the postural control system. However, the ... -
Unstable shoes: Functional concepts and scientific evidence
Nigg, Benno; Federolf, Peter; von Tscharner, Vinzenz; Nigg, Sandro (Journal article; Peer reviewed, 2012-05-17)The purpose of this study was to discuss (a) the conceptual idea behind unstable footwear and (b) the validity and scientific support of some selected claims made with respect to unstable shoes. The concept is that unstable ...