Richard E. A. Van Emmerik

Learn More
It has been suggested that stronger coupling between locomotory and breathing rhythms may occur as a result of training in the particular movement pattern and also may reduce the perceived workload or metabolic cost of the movement. Research findings on human locomotor–respiratory coordination are equivocal, due in part to the fact that assessment(More)
Recent research using measures to assess the time-dependent structure of postural fluctuations has provided new insights into the stability and adaptability of human postural control in adults. To date, little research has examined how postural dynamics reflecting the stability and adaptability of postural control may change as a function of development,(More)
The present paper puts forward the concept of coordinative structures as a way to move from the dynamics of the behavioral outcome towards a characterization of what the subject is actually doing to achieve that outcome. In a discovery learning experiment, five subjects learned to perform slalom-like movements on a ski apparatus over a 7-day period.(More)
Adolescent Idiopathic Scoliosis (AIS) is characterized by three-dimensional deformation of the spine resulting in alterations of body posture and segment alignment [1]. Changes in body posture have been found to relate to stability deficits in AIS patients, which may be exacerbated by AIS severity [2]. Previous work has related AIS patients have reduced(More)
Locomotor respiratory coupling patterns in humans have been assessed on the basis of the interaction between different physiological and motor subsystems; these interactions have implications for movement economy. A complex and dynamical systems framework may provide more insight than entrainment into the variability and adaptability of these rhythms and(More)
Recent research from a dynamical and complex systems perspective has shown that loss of complexity and variability may characterize changes in biological function due to aging and disease. We provide an overview of the empirical evidence for the functional role of variability in the stability and adaptability of human gait. This evidence is derived from(More)
In this study, we describe and compare the compensatory responses of healthy young and older adults to sequentially increasing upper-body perturbations. The scaling of plantarflexor muscular activity and minimum time-to-contact (TtCMIN) was examined, and we determined whether TtCMIN predictions of instability (stepping transitions) for the older subjects(More)
Nonlinear dynamics and dynamical systems approaches and methodologies are increasingly being implemented into biomechanics and human movement research. Based on the early insights of Nicolai Bernstein (1967), a significantly different outlook on the movement control “problem” over the last few decades has emerged. From a focus on relatively simple movements(More)
Human motor coordination is associated with “synergies” in the neuromuscular system that cause our bodies to behave as coordinated units rather than collections of decoupled degrees of freedom. The focus of this paper is the role that synergies play for robot motor coordination, and in particular, we use a weightlifting task to demonstrate how(More)
Nonlinear dynamics and dynamical systems approaches and methodologies are increasingly being implemented in biomechanics and human movement research. Based on the early insights of Nicolai Bernstein (1967), a significantly different outlook on the movement control “problem” over the last few decades has emerged. From a focus on relatively simple movements(More)