Influence of activity-specific load alternations in repetitive externally paced work on risk surrogate parameters of musculoskeletal diseases - results of an exploratory laboratory study

Influence of activity-specific load alternations in repetitive externally paced work on risk surrogate parameters of musculoskeletal diseases - results of an exploratory laboratory study - TAKT

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

DRKS

Registry ID

DRKS00026951

Enrollment

Registered

2021-11-16

Start date

2021-11-22

Completion date

Unknown

Last updated

2025-04-07

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

The risk of work-related musculoskeletal disorders or discomfort at the upper body using surrogate parameters.

Interventions

Group 1: 2.5 hours of manual assembly work Group 2: 2.5 hours of redesigned manual assembly work

Eligibility

Sex/Gender

All

Age

18 Years to 67 Years

Inclusion criteria

Inclusion criteria: - signed statement of informed consent and Data protection - sufficient knowledge of German

Exclusion criteria

Exclusion criteria: - Functional limitations of the upper extremities (functional tests) - acute illness or pain - acute high blood pressure (systolic > 140 mmHg) - consumption of certain drugs especially antihypertensives, antipsychotics or psychotropic drugs

Design outcomes

Primary

Measure	Time frame
In this study, designed as a proof-of-concept, several parameters associated with musculoskeletal complaints and diseases will be investigated exploratively. These are: To be taken after exposures : - Perceived workload (NASA-TLX) To be taken before and after exposures and every 20 min during exposures: - Subjective discomfort rating of the upper extremity (Numerical Rating scale) - Received Perception of Exertion (Borg scale) Continuous measurements during the exposures: - Cycle-to-cycle variability of muscular activity (Root Means Square) in the shoulder-neck region and forearms using surface electromyography - Cycle-to-cycle variability of acceleration of the forearms using accelerometry - Within-cycle variability of muscular activity (Root Means Square) in the shoulder-neck region and forearms using surface electromyography - Within-cycle variability of acceleration of the forearms using accelerometry - Level and type of muscular activity/strain (10th, 50th, 90th percentile of Root Means Square) of muscles of the shoulder-neck region and forearms using surface electromyography - Signs of muscular fatigue (50th percentile of Root Means Square and median frequency) of muscles of the shoulder-neck region and forearms using surface electromyography - Muscular recovery times: EMG-gaps , SULMA-periods and -episodes, bursts using surface electromyography. - Stress on the cardiovascular system (mean heart rate) using electrocardiography	—

Measure

Time frame

In this study, designed as a proof-of-concept, several parameters associated with musculoskeletal complaints and diseases will be investigated exploratively. These are: To be taken after exposures : - Perceived workload (NASA-TLX) To be taken before and after exposures and every 20 min during exposures: - Subjective discomfort rating of the upper extremity (Numerical Rating scale) - Received Perception of Exertion (Borg scale) Continuous measurements during the exposures: - Cycle-to-cycle variability of muscular activity (Root Means Square) in the shoulder-neck region and forearms using surface electromyography - Cycle-to-cycle variability of acceleration of the forearms using accelerometry - Within-cycle variability of muscular activity (Root Means Square) in the shoulder-neck region and forearms using surface electromyography - Within-cycle variability of acceleration of the forearms using accelerometry - Level and type of muscular activity/strain (10th, 50th, 90th percentile of Root Means Square) of muscles of the shoulder-neck region and forearms using surface electromyography - Signs of muscular fatigue (50th percentile of Root Means Square and median frequency) of muscles of the shoulder-neck region and forearms using surface electromyography - Muscular recovery times: EMG-gaps , SULMA-periods and -episodes, bursts using surface electromyography. - Stress on the cardiovascular system (mean heart rate) using electrocardiography

—

Secondary

Measure	Time frame
see primary endpoints	—

Countries

Germany

Contacts

Public ContactBenjamin Steinhilber

Institut für Arbeitsmedizin, Sozialmedizin und Versorgungsforschung, Universitätsklinikum Tübingen

benjamin.steinhilber@med.uni-tuebingen.de0049 7071 2986805

Outcome results

None listed

Source: DRKS (via WHO ICTRP) · Data processed: Feb 4, 2026