Oqus 3

Manufactured by Qualisys

Sourced in Sweden

The Oqus 3 is a motion capture camera system designed for precise three-dimensional (3D) data acquisition. It features high-resolution video sensors and advanced tracking capabilities to capture the movement of objects or subjects with a high degree of accuracy and detail.

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Lab products found in correlation

Visual3d, by C-Motion (3 mentions) Bagnoli system, by Delsys (2 mentions) Track manager, by Qualisys (1 mentions) Track manager qtm, by Qualisys (1 mentions)

10 protocols using oqus 3

Kinematic and EMG Analysis of Dominant Limb

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The dominant (preferred kicking) limb was selected for data collection. Prior to electrode placement, the skin was shaved abraded and cleaned with isopropyl alcohol. Parallel-bar EMG Sensors (DE-2.1, DELSYS, USA) were then placed over the BF and ST in accordance to SENIAM guidelines (Hermens et al. 2000). EMG signals were amplified (1 k gain) via a Delsys Bagnoli system (Delsys Inc. Boston, MA, USA) with a bandwidth of 20–450 Hz. The common mode rejection rate and input impedance were -92 dB and >10¹⁵Ω, respectively. Data was collected at 1000 Hz synchronously with the kinematic data.
Lower extremity planar kinematics was monitored using a 10-camera retroreflective system at 200 Hz (Oqus 3, Qualisys Gothenburg, Sweden). Four retroreflective soft markers (19 mm) were placed over the lateral malleolus, lateral knee joint, greater trochanter and acromion process of the dominant limb. Following tracking, kinematic and sEMG data were exported for analysis to Visual 3D (C-Motion Inc. USA).

Monajati A., Larumbe-Zabala E., Goss-Sampson M, & Naclerio F. (2017). Analysis of the Hamstring Muscle Activation During two Injury Prevention Exercises. Journal of Human Kinetics, 60, 29-37.

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Macaque Hurdling Kinematics and Forces

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The macaques run across a flat wooden track (length: 5 m) with two embedded force plates (0.4 m×0.6 m). During hurdling, two hurdles (height: 0.1 m) were placed at the beginning and the end of the two force plates (0.81 m apart; Fig. 1A). While the macaques crossed the track kinematics (10 s), ground reaction forces for two consecutive steps were captured with an eight-camera infrared motion capture system (Oqus 3+, Qualisys, Göteborg, Sweden) and the force plates (EPF-S-1.5KNSA13; Kyowa Dengyo, Tokyo), respectively, at a rate of 200 Hz.

Blickhan R., Andrada E., Hirasaki E, & Ogihara N. (2024). Skipping without and with hurdles in bipedal macaque: global mechanics. The Journal of Experimental Biology, 227(7), jeb246675.

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Motion Capture of Violin Performance

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Motion-capture data were recorded using a Qualisys Oqus 3+ passive optical motion-capture system consisting of seven cameras in a circular configuration around the participant. The cameras were positioned at a height of about 2.8 m, and the radius was about 2.5–3 m. The motion-capture sample rate was 240 Hz. Audio (48 kHz, 16 bit) and video (30 Hz) were synchronously recorded with the motion capture data, and were mainly used for control purposes.
A custom marker configuration, especially suitable for the analysis of upper-body and arm movements, was used for measuring full-body motion. (An analysis of the body-motion data falls outside the scope of the current paper and will be presented elsewhere.) The violin and the bow were equipped with 5 markers each, using a similar marker configuration as described in [2] (link), allowing for accurate 6DOF tracking. In addition, the bow was equipped with a custom-made sensor for measurement of bow force [72] and a miniature 3D accelerometer (ST, type LIS344ALH, linear range ±6 g). The sample rate of sensor data was 1.2 kHz (5 times the motion-capture sample rate). The total mass added to the bow was about 14 g, mainly concentrated in the lower part of the bow (closest to the hand of the player). All participants reported that they were able to perform normally. One participant (STUD2) made a critical remark about the added mass.

Schoonderwaldt E, & Altenmüller E. (2014). Coordination in Fast Repetitive Violin-Bowing Patterns. PLoS ONE, 9(9), e106615.

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Ground Reaction Forces and Kinematics Measurement

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All side-cutting was performed over a 0.9 x 0.6 m Kistler force platform (9287C, Kistler Instruments Ltd., Winterthur, Switzerland) sampling at 1500 Hz for the measurement of ground reaction forces. Simultaneous kinematic data was recorded in Qualisys Track Manager (Qualisys AB, Gothenburg, Sweden) using 10 optoelectronic cameras (Oqus 3, Qualisys AB, Gothenburg, Sweden) sampling at 250 Hz.

Sankey S.P., Raja Azidin R.M., Robinson M.A., Malfait B., Deschamps K., Verschueren S., Staes F, & Vanrenterghem J. (2015). How reliable are knee kinematics and kinetics during side-cutting manoeuvres?. Gait & posture, 41(4).

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3D Kinematic Analysis of Crawl Swim

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While performing the 50-m front crawl test, swimmers used 10 anatomical reflective landmarks in each body side (iliac crest, acromion, lateral humerus epicondyle, and radius- and ulnar-styloid processes), enabling a 3D dual media working volume creation, where the orthogonal axes were defined as x, y, and z for horizontal, medio-lateral, and vertical (z = 0 defines the water surface) movements, respectively. A 13 camera setup (MoCap) was used, with seven land plus six underwater cameras (Oqus 3+ and Oqus Underwater, Qualisys AB, Gothenburg, Sweden) operating at 100 Hz. The calibrated volume was defined using underwater, above water, and twin system to merge the first and the latter calibrations (according to the manufacturer’s guidelines).

Silva A.F., Figueiredo P., Vilas-Boas J.P., Fernandes R.J, & Seifert L. (2022). The Effect of a Coordinative Training in Young Swimmers’ Performance. International Journal of Environmental Research and Public Health, 19(12), 7020.

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Basketball Shooting Kinematics: Motion Capture

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We applied the same procedure as in Experiment 1, however, we used different recording equipment: the Qualisys Track Manager (QTM, Qualisys AB, Sweden) software and eight cameras (OQUS 3+, Qualisys AB, Sweden, resolution: 1280 × 1224 pixels, 200 Hz) located in a circular manner. Unlike in Experiment 1, tests and practice sessions took place in a laboratory where cameras and professional basketball board were mounted to the wall.
All shots were recorded with a digital high-speed camera (Exilim, Casio EX-ZR10, 40 fps) in order to score shots appropriately. The first five shots taken from the free-throw line (i.e., 4.57 m) during pretest and posttest were recorded for kinematic analysis.
We defined starting and ending points similarly to the Lam et al. (2009) (link) procedure, i.e., a starting point of the movement as the point at which the shooting arm’s elbow marker was at its lowest position during preparation, whereas the ending point as the point 20 frames after the hand’s marker was at its highest position following release of the ball.
Unlike Experiment 1, all participants practiced and were tested barefoot.

Czyż S.H., Zvonař M, & Pretorius E. (2019). The Development of Generalized Motor Program in Constant and Variable Practice Conditions. Frontiers in Psychology, 10, 2760.

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Torso Motion Capture Protocol

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The OEP system consisted of 11 cameras (Oqus 3, Qualisys AB, Goteborg, Sweden) sampling at 100 Hz and were positioned around a cycle ergometer (Lode-Corival, Netherlands). Ninety reflective markers were placed on the participants' torso in a grid-like pattern [17 (link), 18 (link)]. This marker set allows for the division of the torso into the pulmonary ribcage (RCp), the abdominal ribcage (RCa), and the abdomen (AB).

Smyth C.M., Winter S.L, & Dickinson J.W. (2022). Breathing Pattern Disorders Distinguished from Healthy Breathing Patterns Using Optoelectronic Plethysmography. Translational Sports Medicine, 2022, 2816781.

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Limb Kinematics and Muscle Activity

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The dominant (preferred kicking) limb was selected for data collection. Prior to electrode placement, the skin was shaved, abraded and cleaned with isopropyl alcohol. Parallel-bar EMG Sensors (DE-2.1, DELSYS, USA) were then placed over the BF, ST, VL and VM in accordance with SENIAM guidelines (Hermens et al., 2000 (link)). EMG signals were amplified (1 k gain) via a Delsys Bagnoli system (Delsys Inc. Boston, MA, USA) with a band-width of 20–450 Hz. A common mode rejection rate and input impedance were -92 dB and >10¹⁵Ω, respectively. Data was collected at 1000 Hz synchronously with the kinematic data.
Lower extremity planar kinematics was monitored using a 10-camera retroreflective system at 200 Hz (Oqus 3, Qualisys Gothenburg, Sweden). Four retroreflective soft markers (19 mm) were placed over the lateral malleolus, lateral knee joint, greater trochanter and acromion process of the dominant limb. Following tracking, kinematic and sEMG data were exported for analysis in Visual 3D (C-Motion Inc. USA).

Monajati A., Larumbe-Zabala E., Goss-Sampson M, & Naclerio F. (2019). Surface Electromyography Analysis of Three Squat Exercises. Journal of Human Kinetics, 67, 73-83.

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Kinematic and Force Data Collection

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Kinematic data were collected in a laboratory setting using an eight-camera optoelectronic system (250 Hz; OQUS 3; Qualisys). Ground reaction forces were registered by means of a force plate (250 Hz; Advanced Mechanical Technology, Inc., Watertown, MA) built into the landing zone.

De Ridder R., Willems T., Vanrenterghem J., Robinson M.A, & Roosen P. (2015). Lower limb landing biomechanics in subjects with chronic ankle instability. Medicine and science in sports and exercise, 47(6).

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Barbell Kinematics and Kinetics

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Retroreflective (12 mm) markers were placed on both ends of the bar. Motion was captured and tracked at 200 Hz using 10 infrared cameras (Oqus 3, Qualisys Track Manager, Qualysis AB, Sweden). Prior to capture, the working volume was calibrated with a mean residual error of 0.6 mm. Synchronous to motion capture, ground reaction forces were recorded at 200 Hz from a Kistler multicomponent force platform (Kistler Group, Switzerland). All data were subsequently exported to Visual3D (C-Motion, Inc. Germantown, USA) for processing. Kinematic data were filtered using a bidirectional low pass filter with a cut-off frequency of 10 Hz. To obtain a marker coinciding with the vertical axis of the barbell, a virtual marker was created midway between the two aforementioned tracking markers. This virtual marker was then used to measure the vertical displacement and vertical velocity of the bar as well as to estimate the applied force and produced mechanical power.

Laza-Cagigas R., Goss-Sampson M., Larumbe-Zabala E., Termkolli L, & Naclerio F. (2019). Validity and reliability of a novel optoelectronic device to measure movement velocity, force and power during the back squat exercise. Journal of sports sciences, 37(7).

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