Journal article
Adapting a fatigue model for shoulder flexion fatigue: Enhancing recovery rate during intermittent rest intervals
Journal of biomechanics, Vol.106, p.109762
06/09/2020
DOI: 10.1016/j.jbiomech.2020.109762
PMCID: PMC8848298
PMID: 32517992
Abstract
Although the rotator cuff muscles are susceptible to fatigue, shoulder fatigue studies reporting torque decline during intermittent tasks are relatively uncommon in the literature. A previous modification to the three-compartment controller (3CC) fatigue model incorporated a rest recovery multiplier (3CC-r model) to represent augmented blood flow to muscle during rest intervals (Looft et al., 2018). A rest recovery value of r = 15 was optimal for ankle, knee, and elbow joint regions, whereas r = 30 was better for hand/grip muscles. However, shoulder torque decline data was unavailable in the literature for comparison. Thus, the purpose of this study was to collect fatigue data for two different intermittent, isometric shoulder flexion fatiguing tasks and assess the 3CC-r model with r = 15 or 30 compared to the original 3CC model. Twenty healthy participants (9 M) completed two fatigue tasks: 50% maximum voluntary contraction (MVC) with 50% duty cycle (DC) and 70% MVC with 70% DC. MVCs were assessed at discrete time points (1, 3, 5, 10, and 15 min) until endurance time (MET). Mean observed percent torque decline (% TD) for the two tasks were compared to three model estimates: 3CC-r (using r = 15 and r = 30) and 3CC. Using these data, we confirmed that the addition of a rest multiplier (r = 15 somewhat better than r = 30) substantially improved predictions of shoulder fatigue using a previously validated analytical fatigue model (3CC). The relatively large reduction in model errors over the original model suggests the importance of representing augmented recovery during rest periods. Published by Elsevier Ltd.
Details
- Title: Subtitle
- Adapting a fatigue model for shoulder flexion fatigue: Enhancing recovery rate during intermittent rest intervals
- Creators
- John M. Looft - University of IowaLaura A. Frey-Law - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of biomechanics, Vol.106, p.109762
- DOI
- 10.1016/j.jbiomech.2020.109762
- PMID
- 32517992
- PMCID
- PMC8848298
- NLM abbreviation
- J Biomech
- ISSN
- 0021-9290
- eISSN
- 1873-2380
- Publisher
- Elsevier
- Number of pages
- 8
- Grant note
- University of Iowa Heartland Center K01AR056134 / National Institutes for Health; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA
- Language
- English
- Date published
- 06/09/2020
- Academic Unit
- Nursing; Physical Therapy and Rehabilitation Science
- Record Identifier
- 9984295057402771
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