Name: kinematic analysis using 3d motion capture of drinking task in people with and without upper-extremity impairments
Uploaded: 2018-03-28T13:30:00
Description: Watch this Scientific Journal Video about Kinematic Analysis Using 3D Motion Capture of Drinking Task in People With and Without Upper-extremity Impairments at JoVE.com

Special thanks to Bo Johnels, Nasser Hosseini, Roy Tranberg and Patrik Almstr&#246;m for help with the initiation of this project. The research data presented in this protocol was gathered at the Sahlgrenska University Hospital.

All methods described here have been part of the studies approved by the Regional Ethical Review Board in Gothenburg, Sweden (318-04, 225-08).
1. Setting up the Motion Capture System
<ol>
	<li>Mount 4 cameras on the wall approximately 1.5 - 3 m away from the measurement area at the height of 1.5 - 2.5 m facing the measurement area. Mount one camera on ceiling just above the measurement area (Figure 1). Start the camera system.</li>
	<li>Place the L-shape calibra...

<ol>
	<li>Alt Murphy, M., H&#228;ger, C. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Kinematic+analysis+of+the+upper+extremity+after+stroke+-+how+far+have+we+reached+and+what+have+we+grasped?.">Kinematic analysis of the upper extremity after stroke - how far have we reached and what have we grasped?.</a> Physical Therapy Reviews. 20 (3), 137-155 (2015).</li><li>Bustren, E. L., Sunnerhagen, K. S., Alt Murphy, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Movement+Kinematics+of+the+Ipsilesional+Upper+Extremity+in+Persons+With+Moderate+or+Mild+Stroke.">Movement Kinematics of the Ipsilesional Upper Extremity in Persons With Moderate or Mild Stroke.</a> Neurorehab Neural Re. 31 (4), 376-386 (2017).</li><li>Sivan, M., O'Connor, R. J., Makower, S., Levesley, M., Bhakta, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Systematic+review+of+outcome+measures+used+in+the+evaluation+of+robot-assisted+upper+limb+exercise+in+stroke.">Systematic review of outcome measures used in the evaluation of robot-assisted upper limb exercise in stroke.</a> J Rehabil Med. 43 (3), 181-189 (2011).</li><li>Demers, M., Levin, M. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Do+Activity+Level+Outcome+Measures+Commonly+Used+in+Neurological+Practice+Assess+Upper-Limb+Movement+Quality?.">Do Activity Level Outcome Measures Commonly Used in Neurological Practice Assess Upper-Limb Movement Quality?.</a> Neurorehab Neural Re. 31 (7), 623-637 (2017).</li><li>Levin, M. F., Kleim, J. A., Wolf, S. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=What+do+motor+"recovery"+and+"compensation"+mean+in+patients+following+stroke?.">What do motor "recovery" and "compensation" mean in patients following stroke?.</a> Neurorehab Neural Re. 23 (4), 313-319 (2009).</li><li>Alt Murphy, M., Willen, C., Sunnerhagen, K. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Responsiveness+of+Upper+Extremity+Kinematic+Measures+and+Clinical+Improvement+During+the+First+Three+Months+After+Stroke.">Responsiveness of Upper Extremity Kinematic Measures and Clinical Improvement During the First Three Months After Stroke.</a> Neurorehab Neural Re. 27 (9), 844-853 (2013).</li><li>van Dokkum, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+contribution+of+kinematics+in+the+assessment+of+upper+limb+motor+recovery+early+after+stroke.">The contribution of kinematics in the assessment of upper limb motor recovery early after stroke.</a> Neurorehab Neural Re. 28 (1), 4-12 (2014).</li><li>Alt Murphy, M., Willen, C., Sunnerhagen, K. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Kinematic+variables+quantifying+upper-extremity+performance+after+stroke+during+reaching+and+drinking+from+a+glass.">Kinematic variables quantifying upper-extremity performance after stroke during reaching and drinking from a glass.</a> Neurorehab Neural Re. 25 (1), 71-80 (2011).</li><li>Subramanian, S. K., Yamanaka, J., Chilingaryan, G., Levin, M. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Validity+of+movement+pattern+kinematics+as+measures+of+arm+motor+impairment+poststroke.">Validity of movement pattern kinematics as measures of arm motor impairment poststroke.</a> Stroke. 41 (10), 2303-2308 (2010).</li><li>Michaelsen, S. M., Dannenbaum, R., Levin, M. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Task-specific+training+with+trunk+restraint+on+arm+recovery+in+stroke:+randomized+control+trial.">Task-specific training with trunk restraint on arm recovery in stroke: randomized control trial.</a> Stroke. 37 (1), 186-192 (2006).</li><li>Kwakkel, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Standardized+measurement+of+sensorimotor+recovery+in+stroke+trials:+Consensus-based+core+recommendations+from+the+Stroke+Recovery+and+Rehabilitation+Roundtable.">Standardized measurement of sensorimotor recovery in stroke trials: Consensus-based core recommendations from the Stroke Recovery and Rehabilitation Roundtable.</a> Int J Stroke. 12 (5), 451-461 (2017).</li><li>Wagner, J. M., Lang, C. E., Sahrmann, S. A., Edwards, D. F., Dromerick, A. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sensorimotor+impairments+and+reaching+performance+in+subjects+with+poststroke+hemiparesis+during+the+first+few+months+of+recovery.">Sensorimotor impairments and reaching performance in subjects with poststroke hemiparesis during the first few months of recovery.</a> Phys Ther. 87 (6), 751-765 (2007).</li><li>van Kordelaar, J., van Wegen, E., Kwakkel, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impact+of+time+on+quality+of+motor+control+of+the+paretic+upper+limb+after+stroke.">Impact of time on quality of motor control of the paretic upper limb after stroke.</a> Arch Phys Med Rehab. 95 (2), 338-344 (2014).</li><li>Thielman, G., Kaminski, T., Gentile, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rehabilitation+of+reaching+after+stroke:+comparing+2+training+protocols+utilizing+trunk+restraint.">Rehabilitation of reaching after stroke: comparing 2 training protocols utilizing trunk restraint.</a> Neurorehab Neural Re. 22 (6), 697-705 (2008).</li><li>Armbruster, C., Spijkers, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Movement+planning+in+prehension:+do+intended+actions+influence+the+initial+reach+and+grasp+movement?.">Movement planning in prehension: do intended actions influence the initial reach and grasp movement?.</a> Motor Control. 10 (4), 311-329 (2006).</li><li>Qualisys. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Qualisys Track Manager user manual. , (2008).</li><li>Alt Murphy, M., Banina, M. C., Levin, M. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Perceptuo-motor+planning+during+functional+reaching+after+stroke.">Perceptuo-motor planning during functional reaching after stroke.</a> Exp Brain Res. , (2017).</li><li>Sint Jan, S. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Color atlas of skeletal landmark definitions : guidelines for reproducible manual and virtual palpations. , (2007).</li><li>Alt Murphy, M., Sunnerhagen, K. S., Johnels, B., Willen, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Three-dimensional+kinematic+motion+analysis+of+a+daily+activity+drinking+from+a+glass:+a+pilot+study.">Three-dimensional kinematic motion analysis of a daily activity drinking from a glass: a pilot study.</a> J Neuroeng Rehabil. 3, 18 (2006).</li><li>Alt Murphy, M., Willen, C., Sunnerhagen, K. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Movement+kinematics+during+a+drinking+task+are+associated+with+the+activity+capacity+level+after+stroke.">Movement kinematics during a drinking task are associated with the activity capacity level after stroke.</a> Neurorehab Neural Re. 26 (9), 1106-1115 (2012).</li><li>Alt Murphy, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Development and validation of upper extremity kinematic movement analysis for people with stroke. Reaching and drinking from a glass. , (2013).</li><li>Persson, H. C., Alt Murphy, M., Danielsson, A., Lundgren-Nilsson, A., Sunnerhagen, K. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+cohort+study+investigating+a+simple,+early+assessment+to+predict+upper+extremity+function+after+stroke+-+a+part+of+the+SALGOT+study.">A cohort study investigating a simple, early assessment to predict upper extremity function after stroke - a part of the SALGOT study.</a> BMC Neurol. 15, 92 (2015).</li><li>Hoonhorst, M. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=How+Do+Fugl-Meyer+Arm+Motor+Scores+Relate+to+Dexterity+According+to+the+Action+Research+Arm+Test+at+6+Months+Poststroke?.">How Do Fugl-Meyer Arm Motor Scores Relate to Dexterity According to the Action Research Arm Test at 6 Months Poststroke?.</a> Arch Phys Med Rehab. 96 (10), 1845-1849 (2015).</li><li>Pang, M. Y., Harris, J. E., Eng, J. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+community-based+upper-extremity+group+exercise+program+improves+motor+function+and+performance+of+functional+activities+in+chronic+stroke:+a+randomized+controlled+trial.">A community-based upper-extremity group exercise program improves motor function and performance of functional activities in chronic stroke: a randomized controlled trial.</a> Arch Phys Med Rehab. 87 (1), 1-9 (2006).</li><li>Alt Murphy, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=SALGOT+-+Stroke+Arm+Longitudinal+study+at+the+University+of+Gothenburg,+prospective+cohort+study+protocol.">SALGOT - Stroke Arm Longitudinal study at the University of Gothenburg, prospective cohort study protocol.</a> BMC Neurol. 11, 56 (2011).</li></ol>

The protocol can successfully be used to quantify the movement performance and quality in individuals with moderate and mild upper extremity sensorimotor impairments at all stages after stroke. The feasibility of this protocol has been proved in a clinical setting as early as 3 days post stroke, and showed that the system can be used by trained health professional without specific technical qualifications. Technical expertise is, however, needed to create and develop a program for data analysis. From this aspect, the upp...

Kinematic analysis describes the movements of the body through space and time, including linear and angular displacements, velocities, and accelerations. The optoelectronic motion capture systems use multiple high-speed cameras that either send out infra-red light signals to capture the reflections from passive markers placed on the body or transmit the movement data from active markers containing infrared emitting diodes. These systems are considered as &#39;gold standard&#39; for the acquisition of kinematic data1. These systems are valued for their high accuracy and flexibility in measurements of diverse tasks. Kinematic measures have shown to be effective in capturing smaller changes in movement performance and quality that may be undetected with traditional clinical scales2,3. It has been suggested that kinematics should be used for distinction between true recovery (restoration of premorbid movement characteristics) and the use of compensatory (alternative) movement patterns during the accomplishment of a task4,5.
Upper extremity movements can be quantified using end-point kinematics, generally obtained from a hand marker, and angular kinematics from joints and segments (i.e., trunk). End-point kinematics provide information about trajectories, speed, temporal movement strategies, precision, straightness, and smoothness, while angular kinematics characterize movement patterns in terms of temporal and spatial joint and segment angles, angular velocities, and interjoint coordination. End-point kinematics, such as, movement time, speed, and smoothness are effective to capture the deficits and improvements in movement performance after stroke6,7,8 and angular kinematics show whether the movements of joints and body segments are optimal for a specific task. Kinematics from people with impairments are often compared with movement performance in individuals without impairments8,9. End-point and angular kinematics are correlated in a way that a movement performed with effective speed, smoothness, and precision will require good movement control, coordination, and use of effective and optimal movement patterns. For example, a patient with stroke who moves slowly usually also shows decreased smoothness (increased number of movement units), lower maximum velocity, and increased trunk displacement8. On the other hand, improvements in endpoint kinematics, such as movement speed and smoothness might occur independently from the changes of compensatory movement strategies of trunk and arm10. It has been established that kinematic analysis may provide additional and more precise information about how the task is accomplished after an injury or disease, which in turn is essential for individualized effective treatment to reach optimal motor recovery11. Kinematic analysis is increasingly used in clinical studies to describe the movements in people with upper extremity impairments after stroke8,9, to evaluate motor recovery7,12,13 or to determine the effectiveness of therapeutic interventions10,14.
Movement tasks often studied in stroke are pointing and reaching, although the use of functional tasks that incorporate manipulation of real everyday objects is increasing1. Since kinematics of reaching depend on the experimental constraints such as the selection of objects and the goal of the task15, it is essential to assess movements during purposeful and functional tasks in which the real difficulties in individual&#39;s daily life will be reflected more closely.
Thus, the aim of this paper is to provide a detailed description of a simple standardized protocol used for kinematic analysis of a purposeful and functional task, drinking task, applied to individuals with upper extremity impairments in acute and chronic stages after stroke. Results from the validation of this protocol for individuals with moderate and mild stroke impairment will be summarized.

<table border="0" cellpadding="0" cellspacing="0" width="665">
	<tbody>
		<tr height="63">
			<td height="63" style="height:63px;width:195px;">5 camera optoelectronic ProReflex Motion capture system (MCU 240 Hz)</td>
			<td style="width:153px;">Qualisys AB, Gthenburg, Sweden</td>
			<td style="width:68px;">N/A</td>
			<td style="width:251px;">Movement analysis system with passive retroreflective markers</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:195px;">Markers&#160;</td>
			<td style="width:153px;">Qualisys AB, Gthenburg, Sweden</td>
			<td style="width:68px;">N/A</td>
			<td style="width:251px;">Retroleflective passive circular markers, diameter of 12 mm</td>
		</tr>
		<tr height="84">
			<td height="84" style="height:84px;width:195px;">Calibration frame and wand</td>
			<td style="width:153px;">Qualisys AB, Gthenburg, Sweden</td>
			<td style="width:68px;">N/A</td>
			<td style="width:251px;">L-shape calibration frame (defines the origin and orientation of the coordinate system); T-shape wand (300 mm)</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:195px;">Qualisys Track Manager</td>
			<td style="width:153px;">Qualisys AB, Gthenburg, Sweden</td>
			<td style="width:68px;">N/A</td>
			<td style="width:251px;">3D Tracking software</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:195px;">Matlab</td>
			<td style="width:153px;">Mathworks, Inc, Natick, Ca</td>
			<td style="width:68px;">N/A</td>
			<td style="width:251px;">Data analysis software</td>
		</tr>
	</tbody>
</table>

kinematic analysis using 3d motion capture of drinking task in people with and without upper-extremity impairments

Kinematic analysis is a powerful method for objective assessment of upper extremity movements in a three-dimensional (3D) space. Three-dimensional motion capture with an optoelectronic camera system is considered as golden standard for kinematic movement analysis and is increasingly used as outcome measure to evaluate the movement performance and quality after an injury or disease involving upper extremity movements. This article describes a standardized protocol for kinematic analysis of drinking task applied in individuals with upper extremity impairments after stroke. The drinking task incorporates reaching, grasping and lifting a cup from a table to take a drink, placing the cup back, and moving the hand back to the edge of the table. The sitting position is standardized to the individual&#39;s body size and the task is performed in a comfortable self-paced speed and compensatory movements are not constrained. The intention is to keep the task natural and close to a real-life situation to improve the ecological validity of the protocol. A 5-camera motion capture system is used to gather 3D coordinate positions from 9 retroreflective markers positioned on anatomical landmarks of the arm, trunk, and face. A simple single marker placement is used to ensure the feasibility of the protocol in clinical settings. Custom-made Matlab software provides automated and fast analyses of movement data. Temporal kinematics of movement time, velocity, peak velocity, time of peak velocity, and smoothness (number of movement units) along with spatial angular kinematics of shoulder and elbow joint as well as trunk movements are calculated. The drinking task is a valid assessment for individuals with moderate and mild upper extremity impairment. The construct, discriminative and concurrent validity along with responsiveness (sensitivity to change) of the kinematic variables obtained from the drinking task have been established.

The protocol described in this article has been applied to individuals with stroke and healthy controls2,6,8,19,20,21. In total, kinematic data from 111 individuals with stroke and 55 healthy controls have been analyzed in different studies. The upper extremity impairment after stroke was defi...

Watch this Scientific Journal Video about Kinematic Analysis Using 3D Motion Capture of Drinking Task in People With and Without Upper-extremity Impairments at JoVE.com

Kinematic Analysis Using 3D Motion Capture of Drinking Task in People With and Without Upper-extremity Impairments

This protocol describes an objective method to evaluate the movement performance and sensorimotor function of the upper extremity applied to individuals with stroke and healthy controls. A standardized test procedure, kinematic analysis and outcome variables for three-dimensional motion capture of drinking task are provided.

Kinematic analysis is a powerful method for objective assessment of upper extremity movements in a three-dimensional (3D) space. Three-dimensional motion ...

The overall goal of this motion capture methodology is to provide an objective method to evaluate the movement performance quality and sensorimotor function of the upper extremity in individuals with stroke and in healthy controls. This method can help answer key questions in the field of neural rehabilitation, such as how does a stroke influence upper extremity movements and recovery and how this information can be used for selecting effective treatments. The main advantage of this technique is that specific movement deficits and recovery that might be undetected when using traditional clinical scales can be quantified in detail.Assisting us for the demonstration of the procedure today will be Ulla-Britt Bergstrom, who is a occupation therapist working at Neural Rehabilitation Clinic at Sahlgrenska University Hospital. To set the motion capture system, mount four cameras on the wall approximately one to three meters away from the measurement area at the height of 1.5 to 2.5 meters facing the measurement area. Mount one camera on the ceiling just above the measurement area.Placing one of the cameras on the ceiling with viewing angle over the entire measurement area was crucial for the data collection. This resulted in almost 100%successful data collection. Start the camera system.Next, place the L-shaped calibration frame on the table with the short axis in line with the edge of the table and the long axis pointing forward. Then, open the 3-D tracking in data acquisition software. Start calibration by selecting capture, then calibrate.Enter the calibration time of 30 seconds and click, okay. Move the wand in all directions throughout the entire measurement area above the chair and table to ensure that all five cameras capture the wand in as many orientations as possible. Accept calibration residuals below 0.5 millimeters.Now, direct the subject, wearing a sleeveless top, to sit on a height-adjustable chair with her back against the chair's back. The upper arm should be in neutral adducted position. Rest the arm on the table and align the wrist with the edge of the table.The knee, hip, and elbow angles should be approximately 90 degrees. Next, place the retro-reflective passive markers with double adhesive tape on the skeletal landmarks of the tested hand, wrist, elbow, right and left shoulder, thorax, and forehead. After that, place two markers on the cup.In this procedure, place a hard plastic cup with 100 milliliters of water 30 centimeters from the table edge in the midline of the subject. Ask the subject to perform the drinking task in a comfortable, self-paced speed by one, reaching and grasping the cup. Two, lifting the cup from the table towards her mouth.Three, taking as sip. Four, placing the cup back on the table behind a marked line. And five, returning to the initial position with the hand on the edge of the table.It is important to encourage the patient to do the task as naturally as possible and therefore, only the three middle trials will be used for calculation of the kinematics to ensure that the patient is familiar with the testing. Make sure the subject understands the instructions and can reach the cup comfortably with the less affected arm without leaning forward. Prior to each recording, ensure the start position is correct and ask the subject to be ready.Start the capture by selecting, start capture and give verbal instructions to tell her to start. When the subject finishes the task, stop the recording by selecting, stop. Record five trials with a short pause between each trial, starting with the less affected arm.Check if the data acquisition reaches 95 to 100%for each identified marker. When incomplete data are detected, perform extra trials after identifying the problem and adjusting the sitting or marker positions to ensure full visibility of the markers in order to obtain at least three successful trials. This figure shows the representative velocity profile of a healthy control performing the drinking task.A smooth bell-shaped velocity profile with one dominant peak can be seen for each movement phase, which is typical for normal movement. In contrary, this figure shows that a velocity profile of an individual with moderate stroke reveals a less smooth profile with increased number of velocity peaks. Also, the peak velocity in each movement phase is lower and the total movement time is longer.This is the animation of the drinking task performed by a healthy control recorded in real time. The markers on the head, trunk, left arm, and two markers on the drinking cup, along with the movement trajectories are displayed. This is the same animation of an individual with stroke.Notice the less smooth movement trajectories and increased forward movement of the trunk during the drinking task. This is an example of the same task performed by an individual with more severe motor impairment. This person also had spasticity.The visible sub-movements indicate repetitive accelerations and decelerations signifying deficits in movement smoothness. Once mastered, this technique can be done in 10 to 15 minutes by any trained professional without specific technical qualifications. Technical expertise is however, needed to create and develop a program for the data analysis.This procedure is particularly relevant for clinical studies due to a simple set-up with straight-forward data acquisition and analysis of an ecologically valid task. Using this method, we obtain valid, reliable, and responsive kinematics that quantify the key elements of the movement analysis in people with stroke. After it's development, this method paved the way for the researchers in the field of neural rehabilitation to explore upper extremity kinematics in general but also, specifically, during purposeful tasks such as drinking from a glass.The key variables identified in the drinking task for people with stroke, such as movement time, smoothness, elbow angle, velocity, and compensatory trunk displacement are also recognized as central for stroke in other tasks. After watching this video, you should have a good understanding how to set up and carry out a simple and clinically feasible kinematic analysis of an upper extremity task using an optical motion capture system.

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