Muscle Fatigue Clinical Trial
Official title:
Trapezius Muscle Fatigue of Long Duration: a Likely Neuromuscular Control Issue
Verified date | February 2019 |
Source | Swiss Federal Institute of Technology |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
This study is expected to demonstrate that during experimental days of seated computer work sustained and focalized low-level muscle activity contributes to the development of long-lasting fatigue effects (and thus possible disorder). On days with and without frequent interruptions, signs of fatigue and the activity pattern of the trapeze muscle are registered and compared using electromyographic registrations of the trapezius muscle.
Status | Completed |
Enrollment | 30 |
Est. completion date | September 5, 2016 |
Est. primary completion date | September 5, 2016 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 40 Years |
Eligibility |
Inclusion Criteria: - healthy experienced computer workers Exclusion Criteria: - chronic pain (more than 30 days within the last 12 months according to the Nordic Questionnaire (Kuorinka et al 1987); - pathologies of the neck, - prior and actual shoulder or neck pain caused by an accident, - skin disease in the neck or shoulder area, - BMI > 30, - sleep disorders (e.g. apnea, restless legs syndrome), - use of medications such as psychotropic drugs, muscle relaxants or analgesics within the last 3 days prior to the experiment, - pregnancy. - any shoulder/neck pain on the day before the experiment. |
Country | Name | City | State |
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n/a |
Lead Sponsor | Collaborator |
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Swiss Federal Institute of Technology | University of Lausanne, University of Michigan, University of Turin, Italy |
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Other | Localized musculoskeletal discomfort | head-neck-shoulders-lower back-elbows-wrists-hip-upper legs-knees-ankles-feet-discomfort rated on 10 cm visual analog scales (adapted from Nordic questionnaire (Kuorinka et al 1987) | At the start, and 70min, 130min, 190min, 310min, 370 min after the beginning of the simulated working activity of both the control and intervention day | |
Other | Visual and general fatigue | 10 cm visual analog scales | At the start, and 70min, 130min, 190min, 310min, 370 min after the beginning of the simulated working activity of both the control and intervention day | |
Other | Effort | 6-20 Borg scale (6= no effort, 20=maximal possible effort) | At the start, and 70min, 130min, 190min, 310min, 370 min after the beginning of the simulated working activity of both the control and intervention day | |
Other | EMG profile recorded by a single bipolar electrode: Dynamic activity | p90 (level of the 90th percentile of the trapezius muscle activity) as an indicator of dynamic activity which may promote variability in the recruitment of motor units | Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day | |
Other | Spatio-temporal distribution of EMG activity: Centroid of active regions | The spatio-temporal distribution of EMG activity is detected by a 2D array of electrodes (64 channels) and the following outcomes are determined: Centroid of active regions | Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day | |
Primary | EMG profile recorded by a single bipolar electrode: Rest-time | Rest-time (percentage of time below 5% of the standard activity level). The percentage of registration time without any rest time is called sustained low level muscle activity. | Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day | |
Primary | Spatio-temporal distribution of EMG activity: Area of muscle activity | The spatio-temporal distribution of EMG activity is detected by a 2D array of electrodes (64 channels) and the following outcomes are determined: Area of muscle active region (n. of channels) |
Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day | |
Primary | Muscle fatigue: Change of muscle twitch | 3-D muscle twitch acceleration pattern measured at the acromion | Change between 30 min before the beginning of the simulated working activity and 30 min after the end of the simulated working activity of both the control and intervention day | |
Primary | Muscle fatigue: Change of dynamic force control accuracy | Force control accuracy (mean squared error between the produced force (N) and the target force (N)) in an isometric dynamic tracking task | Change between 30 min before the beginning of the simulated working activity and 30 min after the end of the simulated working activity of both the control and intervention day | |
Secondary | EMG profile recorded by a single bipolar electrode: Static activity | p10 (level of the 10th percentile of the trapezius muscle activity) as an indicator of static activity primarily associated with continuous activity of the same pool of motor units. | Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day | |
Secondary | Spatio-temporal distribution of EMG activity: Magnitude of activity | The spatio-temporal distribution of EMG activity is detected by a 2D array of electrodes (64 channels) and the following outcomes are determined: Magnitude of activity of muscle active regions (RMS sEMG). |
Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day | |
Secondary | Spatio-temporal distribution of EMG activity: Number of active epochs | The spatio-temporal distribution of EMG activity is detected by a 2D array of electrodes (64 channels) and the following outcomes are determined: Number of active epochs | Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day | |
Secondary | Muscle fatigue: Change of static force control | Force control accuracy (mean squared error between the produced force (N) and the target force (N)) in isometric isotonic low level contraction | Change between 30 min before the beginning of the simulated working activity and 30 min after the end of the simulated working activity of both the control and intervention day | |
Secondary | Muscle fatigue: Change of force control in ramp contraction | Force control accuracy (mean squared error between the produced force (N) and the target force (N)) in isometric ramp contraction. | Change between 30 min before the beginning of the simulated working activity and 30 min after the end of the simulated working activity of both the control and intervention day |
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