Three-Dimensional Kinematic Characterization of an Object Pick-Up Task Using Motion Capture
May 15th, 2026
This protocol presents a standardized full-body motion capture approach for assessing the object pick-up task, illustrating how distinct movement strategies and compensatory patterns can be quantitatively characterized during this common functional activity.
In this study, we aim to decode the object pickup task using motion capture, and provide a detailed description of its kinematic elements. Existing methods lack a clear understanding of fast performance under normal conditions, and this protocol establishes baseline performance, improving interpretation and clinical applicability. To begin, ask the participant to wear a singlet and lightweight shorts.
Ensure that the participant is barefoot. Instruct the participant to walk a short distance away from the examiner at a comfortable, self-selected pace. Then, ask the participant to turn and walk back toward the examiner at the same pace.
Guide the participant to extend the neck by looking upward. flex the neck by looking downward, rotate the head to the left and right, and tilt the head to both sides. Instruct the participant to bend the body forward and backward, rotate the body to the left and right, and perform side bending to both sides.
Once all movements are completed comfortably and safely, instruct the participant to remain standing for subsequent marker placement. Ensure the participant is standing in a relaxed, upright posture with arms resting naturally by the sides. Palpate the posterior anatomical landmarks and place magnetic bases sequentially over the T4, T8, T10 spinous process, and left and right posterior superior iliac spine.
Next, place a magnetic base over the posterior surface of the iliac crest, approximately two to three inches superolateral to the posterior superior iliac spine. Once the posterior magnetic bases are positioned, secure them with tape. Then, ask the participant to turn and face the examiner while standing upright.
Palpate the left and right anterior superior iliac spines and secure a magnetic base over this landmark. Locate the xiphoid process and place a magnetic base over it. Then, secure the anterior magnetic bases with tape.
Ask the participant to put the top back on and return to an upright standing posture. Palpate the previously placed magnetic bases through the clothing and attach reflective markers onto the magnetic bases sequentially. Instruct the participant to turn away from the examiner and flex the neck forward.
Then, locate the seventh cervical vertebra and place a reflective marker over this landmark. Ask the participant to return to a neutral head position and turn to face the examiner. Identify the sternum and attach a reflective marker over it.
Then, palpate the left and right acromion processes and position a reflective marker over the identified landmark. Instruct the participant to sit comfortably and place the right palm over the left knee. Locate the medial and lateral epicondyles of the right humerus and place a reflective marker over them.
Then, repeat the procedure for the left elbow. Next, ask the participant to place both hands comfortably on the thighs. Identify the radial and ulnar styloid processes and place a reflective marker over this landmark.
Similarly, repeat the procedure for the opposite wrist. Then, palpate the capitate bone in one hand, attach a reflective marker over it, and repeat on the opposite hand. Position one reflective marker on the thumbnail and one reflective marker on the middle finger of each hand.
With the participant seated comfortably, palpate the medial and lateral femoral condyles of the right knee and secure a reflective marker over this landmark. Repeat the procedure for the left knee. Then, locate the medial and lateral malleoli of the right ankle and position a reflective marker.
Next, identify the middle cuneiform, and the first, second and fifth metatarsal heads of the right foot and place a reflective marker over each landmark. Then, palpate the calcaneal tuberosity of the right foot. Secure a reflective marker over this landmark, and repeat the marker placement for the left foot.
Attach marker clusters to the forearm, hand, upper arm, thigh, and shank segments bilaterally. Secure each cluster firmly using straps or tape. Then, position reflective markers bilaterally on the frontal bone just above the eyebrows, followed by placement on the temporal bones.
Using a washable skin marker, outline all markers and clusters placed on the skin for consistent repositioning if necessary. Check for loose markers, cluster movement, and occlusion during standing posture. Correct any placement errors as needed and secure any insecure attachments.
If no issues are identified, proceed to the object pickup task. Arrange the motion capture cameras around the capture volume to ensure full body visibility during forward bending, object interaction, and return to standing. Define a capture volume large enough to accommodate the full pickup movement without occlusion.
Calibrate the motion capture system according to the manufacturer's guidelines to establish the global coordinate system. Verify that all cameras detect reflective markers clearly, and ensure that no unintended reflective objects are present in the capture area. Start motion capture recording before instructing the participant to initiate movement.
Stop recording only after the participant has completed the task. Review the recording to ensure all markers are present before proceeding to the next recording. Ensure the participant stands upright within the capture volume.
Instruct the participant to abduct both arms to approximately 45 degrees from the body, with the elbows fully extended and palms facing forward. Ask the participant to remain still for two seconds while counting aloud, 1000, 2000. Instruct the participant to further abduct both arms to approximately 90 degrees from the body, elbows extended and palms facing downward.
Ask the participant to stay still for two seconds and count aloud, 1000, 2000. Instruct the participant to lower both arms to the sides and stand in a relaxed, neutral posture. Place a standardized object on the floor at a predefined location within the capture volume.
Ask the participant to stand upright in a comfortable, self-selected stance facing the object. Direct the participant to pick up the object from the floor at a comfortable pace, return to a standing position and hand it over. Maintain a comfortable seated or kneeling position on the floor while retrieving and repositioning the object between trials to ensure consistent placement.
Instruct the participant to perform three trials using one hand. Then, repeat the task for three trials using the other hand. Participants were divided into three movement strategy groups;squat dominant, hinge dominant, and hybrid.
There were no significant differences in age, sex distribution, height, or weight among the groups. Knee flexion angles differed significantly across groups for both dominant and non-dominant hand conditions with large effect sizes. Ankle joint kinematics demonstrated significant group differences across dominant and non-dominant hand conditions with large effect sizes.
Torso flexion differed significantly between groups for both dominant and non-dominant hand conditions with moderate effect sizes. Hip joint kinematics did not differ significantly between groups for either dominant or non-dominant hand conditions. Greater flexion was observed at the left ankle and left knee during non-dominant hand object pickup, compared with dominant hand object pickup with large effect sizes.
Significant differences were also observed at the right ankle and left hip between dominant and non-dominant hand conditions with large effect sizes. No significant differences were observed at the right knee, right hip, or torso between dominant and non-dominant hand conditions. This protocol allows researchers to quantify and characterize distinct movement strategies used during an object pickup task, including squad dominant, hinge dominant, and hybrid patterns.
Additional analysis that can be performed following this procedure include joint velocities, center of mass dynamics, and ground reaction forces, providing a more comprehensive understanding of task performance. Future research can expand on our motion capture protocol to examine compensatory mechanisms, particularly in conditions related to musculoskeletal diseases.
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Overview
This article presents a standardized protocol for quantitatively assessing object pick-up strategies using full-body three-dimensional motion capture. The method integrates trunk, lower- and upper-limb coordination, balance, and visuomotor control, providing an ecologically valid approach to studying this fundamental activity of daily living. The protocol enables the identification and classification of distinct movement strategies during object pick-up tasks.
Key Study Components
Area of Science
- Human movement science
- Biomechanics
- Motor control
Background
- The object pick-up task is a common daily activity requiring coordinated whole-body movement.
- Standardized quantitative protocols for analyzing this task are limited.
- Full-body motion capture allows detailed assessment of movement strategies.
- Understanding these strategies can inform rehabilitation and ergonomic interventions.
Purpose of Study
- To demonstrate a reproducible method for capturing and analyzing object pick-up movements.
- To classify and compare different movement strategies using kinematic data.
- To provide a framework for assessing whole-body coordination during functional tasks.
Methods Used
- Participant preparation and comprehensive marker placement for motion capture.
- Execution of the object pick-up task by thirty participants.
- Collection of fourteen kinematic variables during task performance.
- Classification of movement strategies into squat-dominant, hinge-dominant, and hybrid patterns.
Main Results
- Distinct differences in joint kinematics, especially at the knee and ankle, were observed between strategy groups.
- Torso motion contributed to differentiating movement patterns.
- Dominant versus non-dominant hand conditions revealed compensatory adaptations.
- The protocol demonstrated sensitivity in detecting variations in movement strategies.
Conclusions
- The protocol offers a practical and reproducible approach for assessing object pick-up strategies.
- It enables detailed analysis of whole-body coordination during functional movement.
- This framework can support research and clinical assessment of movement strategies.
Frequently Asked Questions
Executive Industry Relevance
Quantitative three-dimensional motion capture of object pick-up tasks enables standardized assessment of whole-body coordination, supporting early discovery of movement phenotypes and functional biomarker development. This protocol provides reproducible kinematic outputs that can inform translational research and mechanistic de-risking in neuromuscular and motor function studies. Its integration of trunk, limb, and balance metrics positions it as a valuable tool for portfolio teams seeking predictive confidence in preclinical and translational models.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables objective quantification of movement strategies for functional target validation.
- Supports mechanistic de-risking by distinguishing squat-dominant, hinge-dominant, and hybrid movement patterns.
- Facilitates identification of compensatory adaptations relevant to disease or injury models.
Screening & Assay Development
- Provides standardized, reproducible kinematic variables for assay development in motor function studies.
- Enables robust comparison of intervention effects across validated movement strategies.
- Supports scalability and platform reuse for compound or genetic screening workflows.
Translational & Preclinical Research
- Aligns kinematic outputs with translational biomarkers of functional movement.
- Enables continuity from discovery through preclinical validation by quantifying whole-body coordination.
- Supports risk-adjusted advancement decisions based on sensitive detection of movement adaptations.
Pipeline & Workflow Integration
This protocol fits within the discovery-to-preclinical continuum, providing quantitative movement data for hypothesis testing, screening, and translational research.
- Discovery Biology: Supports hypothesis testing and pathway clarification through detailed kinematic analysis.
- Screening: Delivers reproducible, quantitative outputs for comparing intervention groups.
- Analytics: Generates joint angle and coordination metrics for robust statistical analysis.
- Translational Research: Bridges discovery and preclinical work by aligning movement phenotypes with functional biomarkers.
- Enterprise Reuse: Offers a standardized framework adaptable across disease models and intervention studies.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in movement studies.
- Operational Value: Enhances standardization, reproducibility, and scalability of kinematic assessments.
- Strategic Value: Improves go/no-go decisions and capital efficiency by providing sensitive, quantitative endpoints.
- Portfolio Impact: Enables risk-adjusted prioritization and advancement of motor function programs.
Implementation Considerations
- Requires expertise in motion capture technology and kinematic data analysis.
- Needs access to full-body motion capture instrumentation and analytical software.
- Demands cross-team standardization of marker placement and data processing protocols.
- Adaptable to various model systems with consideration for task-specific modifications.
- Dependent on participant compliance and ecological validity of the pick-up task.
