Search Results

You are looking at 1 - 10 of 43 items for :

  • "coordination variability" x
  • All content x
Clear All
Restricted access

Eric Foch and Clare E. Milner

have a cumulative damaging effect on the iliotibial band. 12 In addition to atypical coordination patterns, coordination variability may also differ in injured runners compared with controls. For example, lowering coordination variability may be a compensatory mechanism used by runners with previous

Restricted access

Adam E. Jagodinsky, Christopher Wilburn, Nick Moore, John W. Fox, and Wendi H. Weimar

would help improve our understanding of how bracing works to be effective in individuals with and without CAI. Coordination variability may be considered fluctuations in the coordination pattern between 2 segments and can be measured to assess motor adaptations in the presence of constraints (eg

Restricted access

Ben Serrien, Maggy Goossens, and Jean-Pierre Baeyens

athletes. Not only does the average motion pattern across participants deserve attention, but so does the within-subject coordination variability, from a motor control and sport science perspective. Coordination variability (CV) should not be solely interpreted as neuromuscular noise, but for its profound

Restricted access

Hannah E. Wyatt, Gillian Weir, Carl Jewell, Richard E.A. van Emmerik, and Joseph Hamill

stride will always differ to some extent from the previous strides. 1 Calculating the degree of coordination variability (CV) during human movement permits insight into the ability of the system to adapt to perturbations and the extent to which CV is influenced by injury or pathology. 2 Efforts to

Restricted access

Behrouz Abdoli, James Hardy, Javad F. Riyahi, and Alireza Farsi

, McGuigan, & Thatcher, 2009 ), comparing the movement coordination variability associated with instructional and motivational self-talk was another objective for the present study. Targeting movement coordination afforded us the opportunity to examine more closely how self-talk might influence skilled

Restricted access

Joseph F. Seay, Jeffery M. Haddad, Richard E.A. van Emmerik, and Joseph Hamill

Increases in movement variability have previously been observed to be a hallmark property of cooraination changes between coupled oscillators that occur as movement frequency is scaled. Prior research on the walk-run transition in human locomotion has also demonstrated increases in variability around the transition region, supporting predictions of nonequilibrium phase transitions (Diedrich & Warren, 1995). The current study examined the coordinative patterns of both intra- and inter-limb couplings around the walk-run transition using two different temporal manipulations of locomotor velocity as a control parameter in healthy young participants (N = 11). Coordination variability did not increase before the transition. The nature of the change in continuous relative phase variability between gait modes was coupling-specific, and varying the time spent at each velocity did not have an overall effect on gait transition dynamics. Lower extremity inter-limb coordination dynamics were more sensitive to changes in treadmill velocity than intra-limb coordination. The results demonstrate the complexity of segmental coordination change in human locomotion, and question the applicability of dynamical bimanual coordination models to human gait transitions.

Restricted access

Christopher J. Palmer and Richard E.A. van Emmerik

). Generation of increased inertial forces with increases in load during rapid postural transitions was predicted to “push” head, gun, and trunk relations from optimal baseline unloaded coupling angles, increasing between-trial coordination variability (Hypothesis 2). Time between movement cessation and trigger

Restricted access

Christopher L. MacLean, Richard van Emmerik, and Joseph Hamill

The purpose of this study was to analyze the influence of a custom foot orthotic (CFO) intervention on lower extremity intralimb coupling during a 30-min run in a group of injured runners and to compare the results to a control group of healthy runners. Three-dimensional kinematic data were collected during a 30-min run on healthy female runners (Shoe-only) and a group of female runners who had a recent history of overuse injury (Shoe-only and Shoe with custom foot orthoses). Results from the study revealed that the coordination variability and pattern for the some couplings were influenced by history of injury, foot orthotic intervention and the duration of the run. These data suggest that custom foot orthoses worn by injured runners may play a role in the maintenance of coordination variability of the tibia (transverse plane) and calcaneus (frontal plane) coupling during the Early Stance phase. In addition, it appears that the coupling angle between the knee (transverse plane) and rearfoot (frontal plane) joints becomes more symmetrical in the late stance phase as a run progresses.

Restricted access

Hai-Jung Steffi Shih, Danielle N. Jarvis, Pamela Mikkelsen, and Kornelia Kulig

central nervous system often controls movement variability based on task relevance. For example, expert dancers exhibit greater trunk coordination variability right before landing of bipedal jumps, possibly a combined effect of feedback control from each unique flight characteristic and feedforward

Restricted access

Scott W. Ducharme and Richard E.A. van Emmerik

locomotion ( Hamill, Van Emmerik, Heiderscheit, & Li, 1999 ; Wagenaar & Van Emmerik, 1994 ). Much of this research emerged from a dynamical systems perspective on human movement with a special emphasis on coordination and coordination variability. Next, we will briefly review what clinical gait and sports