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This research will provide data on evaluation of the effectiveness and safety of using a passive exoskeleton designed to reduce the negative impact of static and dynamic loads associated with lifting and holding weights and having workspace over head on the musculoskeletal system of workers. To evaluate a passive industrial exoskeleton for upper limb support, a protocol was developed in which individual production operations will be modeled.
This research will recruit 12 volunteers. During a 4-hour laboratory visit, each subject will perform two identical experimental tests: one test without an exoskeleton and another one using the exoskeleton. To avoid sequence bias, the test order will be randomized (balanced). The labor operation will be simulated. This operation's cycle will consist of lifting the load, which is 5-10 kg off the table, holding it over head and touching 4 points in order on a horizontal plate for 2 min. After this volunteer is resting for 1 min. The work will be performed for 105 minutes, then a break of 15 minutes, then 105 minutes of work. Heart rate (Polar) will be monitored. An ergospirometric device (Metamax) will be used to collect muscle activity data (Trust-M, Myoton), inertial sensors (Trust-M) will be used to evaluate the biomechanics of movements. In addition, questionnaires will be filled out for a subjective assessment of the use of exoskeleton prototypes (local discomfort scale, exoskeleton properties assessment questionnaire).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| With exoskeleton | Experimental | The experimental trial will be performed with exoskeleton. |
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| Without exoskeleton | Experimental | The experimental protocol will be performed without exoskeleton. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Passive industrial exoskeleton for the upper limb | Device | The goal is to compare the human response to the simulated industrial tasks |
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| Measure | Description | Time Frame |
|---|---|---|
| Heart rate | A Polar H10 heart rate monitor (Polar Electro, Finland) will carry all items during the entire research | 4 hours |
| Blood pressure (Systolic and diastolic) | A Custo med blood pressure monitor will be used by all subjects throughout the study | 4 hours |
| Range of motion in large joints of the upper, lower limbs and spine | Inertial sensors will be mounted on the body of the volunteer. The amplitude of the moving in the shoulder, elbow, hip, knee joints and in the thoracolumbar spine is determined. Flexion and extension, abduction and adduction, rotation are performed. | 1 hour |
| Metabolic cost of ergospirometric testing | A Metamax 3B instrument (Cortex, Germany) will be used to measure a metabolic cost during all labor activities. | 4 hours |
| Surface electromyography | Trust-M sensors with electrodes will be used to collect electromyographic data in accordance with the SENIAM recommendations. The muscles that will be monitored, the muscles of the arms, legs and back, which account for the maximum load. The locations of the sensors will be prepared by shaving, abrasion with sandpaper, and alcohol cleaning. The average amplitude of the EMG spectrum will be collected. The recording will be carried out at rest, standing before and after work, as well as outside work in the voltage position without exoskeleton and with it. | 1.5 hours |
| Myotonometry | Myotonometry will be performed with a Myoton Pro device. Parameters of the certain muscles, which get the maximum load, will be measured at rest standing before and after work, as well as outside work in a stress position without an exoskeleton and with it. |
| Measure | Description | Time Frame |
|---|---|---|
| Exoskeleton parameter evaluation form | Questionnaire on partial and general parameters of the exoskeleton and user experience | 30 minutes |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Federal State Budgetary Scientific Institution Izmerov Research Institute of Occupational Health | Moscow | 105275 | Russia |
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Randomized counterbalanced cross-over design
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| The protocol will be performed without exoskeleton | Other | The protocol will be performed without exoskeleton |
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| 1.5 hours |
| Local Comfort Rating Scale | This questionnaire is for assessing the duration of maintaining a working posture without discomfort, fixing their appearance, as well as the nature of these sensations. Points can vary from 1 to 10, where 1 is the absence of pain, 10 is unbearable pain. | 1 hours |