Torso Kinematics in Human Rolling Do Not Change When Upper Extremity Motion Is Constrained.

Area of Science:

• Biomechanics
• Human Movement Analysis
• Neuromusculoskeletal Research

Background:

• Human rolling is a fundamental activity of daily living.
• Quantitative analysis of rolling can aid in identifying neuromusculoskeletal disorders and developing interventions.
• Understanding rolling mechanics is crucial for rehabilitation and assistive technology.

Purpose of the Study:

• To investigate the effect of crossing arms over the chest on fundamental coordination patterns during human rolling.
• To determine if arm position influences the kinematic parameters of rolling.
• To assess the role of the upper extremities in the basic act of turning in bed.

Main Methods:

• Kinematic data were collected from 24 healthy subjects.
• Subjects performed rolling movements with and without their arms crossed over their chest.
• Analysis focused on peak angular velocities and coordination of the shoulders and pelvis.

Main Results:

• Crossing the arms significantly decreased mean peak angular velocities of the shoulders (p = .001) and pelvis (p = .013).
• Arm position influenced the mean duration of the rolling movement (p = .057).
• No fundamental differences in shoulder and pelvis coordination patterns were observed when arms were crossed.

Conclusions:

• While arm position affects the speed and duration of rolling, it does not alter the core coordination strategies of the trunk and pelvis.
• The findings imply that the arms may not play a major role in the fundamental neuromuscular control of rolling.
• This research provides insights into the biomechanics of bed mobility and can inform strategies for individuals with impaired rolling ability.