The effect of two types of maximal voluntary contraction and two electrode positions in field recordings of forearm extensor muscle activity during hotel room cleaning
| Autor: | Lotta Löfqvist, Henrik Enquist, Camilla Dahlqvist, Catarina Nordander |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Adult
medicine.medical_specialty Wrist Physical medicine and rehabilitation Voluntary contraction Forearm 99th percentile Humans Medicine Muscle Skeletal Safety Risk Reliability and Quality Electrodes Hand Strength Right forearm Electromyography business.industry Public Health Environmental and Occupational Health Middle Aged body regions Household Work medicine.anatomical_structure Female Extensor muscle Electromyography amplitude business Safety Research Hotel room Muscle Contraction |
| Zdroj: | International Journal of Occupational Safety and Ergonomics. 26:595-602 |
| ISSN: | 2376-9130 1080-3548 |
| DOI: | 10.1080/10803548.2019.1599572 |
| Popis: | Purpose. This study aimed to investigate the effects of using hand grip or resisted wrist extension as the reference contraction, and two electrode positions, on field recordings of forearm extensor muscle activity. Materials and methods. Right forearm extensor muscle activity was recorded using two electrode pairs (over the most prominent part (position 2) and proximal to that (position 1)) during one working day in 13 female hotel housekeepers. Each subject performed the two maximal voluntary contractions (MVCs), and the electrical activity obtained during these (maximal voluntary electrical activity (MVE)) was used for normalization. Each set of recordings was analysed twice, once using hand grip as the MVC and once using resisted wrist extension. Results. Resisted wrist extension showed a higher group mean MVE than hand grip. Position 2 had higher correlation between MVE and force during the MVCs. The workload during cleaning was lower when using resisted wrist extension as reference than when using hand grip (24%MVE vs 46%MVE; p = 0.002 at position 2) for the 90th percentile. The workload (99th percentile) was overestimated in two subjects when using hand grip as reference. Conclusions. Problems associated with poorly activated forearm extensors can be overcome by using resisted wrist extension as reference. |
| Databáze: | OpenAIRE |
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