Do the Testing Posture and the Grip Modality Influence the Shoulder Maximal Voluntary Isometric Contraction?

Assessing and monitoring shoulder strength is extremely important during rehabilitation. A fixed dynamometer represents a valid and inexpensive assessment method. However, it has not been studied whether posture and grip modality influence shoulder muscle strength. The aim of this study was to compa...

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Bibliographic Details
Published in:Journal of functional morphology and kinesiology 2023-04, Vol.8 (2), p.45
Main Authors: Bravi, Marco, Fossati, Chiara, Giombini, Arrigo, Mannacio, Elena, Borzuola, Riccardo, Papalia, Rocco, Pigozzi, Fabio, Macaluso, Andrea
Format: Article
Language:English
Subjects:
assessment
dynamometer
Muscle contraction
Muscle strength
MVIC
Posture
Range of motion
Rehabilitation
shoulder
strength
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Summary:Assessing and monitoring shoulder strength is extremely important during rehabilitation. A fixed dynamometer represents a valid and inexpensive assessment method. However, it has not been studied whether posture and grip modality influence shoulder muscle strength. The aim of this study was to compare shoulder strength values between sitting and standing positions and between the handle and cuff grip modalities. A total of 40 volunteers were divided into a posture (PG) and a handle-cuff group (HCG). Participants in the PG were asked to perform a maximum voluntary isometric contraction (MVIC) for shoulder flexion, extension, ab-adduction, and intra-extra rotation in standing and sitting positions. The HCG participants were tested in a standing position while holding a handle or with a cuff around their wrist. PG showed higher forces in the standing position for shoulder flexion ( = 0.009); internal rotation showed higher values in the sitting position ( = 0.003). ER/IR ratio was significantly higher in the standing position ( < 0.001). HCG showed higher significant forces during cuff modality in all positions and grip modalities, including the ER/IR ratio ( < 0.05). Different body positions and grip modalities influenced the assessment of shoulder strength as recorded by a fixed dynamometer; therefore, these factors should be carefully considered when carrying out a shoulder strength assessment, and we encourage the development of assessment guidelines to make future clinical trial results comparable.
ISSN:2411-5142
2411-5142
DOI:10.3390/jfmk8020045