Related Experiment Video
Updated: Dec 29, 2025
08:45
Kinematic Analysis Using 3D Motion Capture of Drinking Task in People With and Without Upper-extremity Impairments
Published on: March 28, 2018
11.2K
Whole-body kinematics and coordination in a complex dance sequence: Differences across skill levels.
Michael Chang1, Nicholas O'Dwyer1, Roger Adams2
1University of Sydney, Australia; Charles Sturt University, Australia.
Human Movement Science
|January 29, 2020
Summary
As dancers improve at Cha-Cha-Cha, their movements become less rigid and more coordinated, aligning with Bernstein
Area of Science:
- Motor Learning
- Biomechanics
- Dance Science
Background:
- Bernstein's (1967) model suggests beginners freeze degrees of freedom (DOF) for motor control.
- Skill acquisition involves unfreezing DOF for more dynamic and organized movement.
Purpose of the Study:
- To investigate kinematic differences in Cha-Cha-Cha 'Alternate Basic' across skill levels.
- To determine if these kinematic changes align with Bernstein's coordination development model.
Main Methods:
- Collected 3D kinematic data (36 joint angles) from 29 dancers (beginners, intermediates, experts).
- Utilized a 14-camera infrared motion capture system during a ~60-second dance sequence.
- Applied Principal Component Analysis (PCA) to analyze movement organization and coordinative structures.
Main Results:
- Increased movement amplitude and speed, particularly from beginner to intermediate stages.
- Degrees of freedom (DOF) unfroze progressively, especially in upper limbs, with skill acquisition.
- Movement organization improved, with fewer initial coordinative structures consolidating into one primary structure.
Conclusions:
- Findings support Bernstein's model, showing DOF unfreezing and increased coordination with practice.
- Skill progression in complex dance involves dynamic unfreezing and integration of movement patterns.
- A whole-body perspective is crucial for studying motor skill development; future research should include kinetics.
Related Concept Videos
01:24Muscle Coordination and Action
2.9K
Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement....
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement....
2.9K
01:15Kinematic Equations: Problem Solving
27.1K
When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
27.1K
01:17Kinematic Equations - II
12.7K
The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
12.7K
01:18Kinematic Equations - III
10.1K
The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
Using the kinematic equations,...
10.1K
01:26Kinematic Equations - I
14.0K
When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
14.0K
01:30Kinematic Equations for Rotation
677
In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
677