Reliability of two devices for shoulder strength assessment: Wii Fit Balance Board and hand-held dynamometer

Leonardo Intelangelo, Gonzalo Elias, Ignacio Lassaga, Cristian Bustos, Daniel Jerez-Mayorga

Research output: Contribution to journalArticlepeer-review


Background: The aim of this study was to compare the reliability and agreement between two devices – Wii Fit Balance Board (WBB) versus Hand-Held Dynamometer (HHD) to measure isometric strength during the athletic shoulder (ASH) test in healthy amateur rugby players. Methods: Fifteen males (23.73 ± 2.8 years) completed two testing sessions. Maximal isometric contractions using the dominant arm (D) and non-dominant arm (ND) against a WBB and HHD were assessed at three angles of abduction (180°, ‘I’; 135°, ‘Y’ and 90°, ‘T’), in a prone lying position. Results: The results indicate a very large correlation between the HHD and the WBB. WBB provides acceptable reliability at I-Test D (CV = 9.97%, ICC = 0.88) and HHD in the I-Test D (CV = 8.90%, ICC = 0.94), I-Test ND (CV = 8.60%, ICC = 0.95) in peak strength values. The HHD is most reliable in D ASH I-Y-T (CV = 10.94%) and WBB (CV = 11.05%). In the ND ASH I-Y-T test, the HHD is the most reliable (CV = 12.5%) compared to the WBB (CV = 14.43%). Conclusions: These results suggest that WBB is a reliable device to assess strength in the ASH test with a very large correlation with the HHD. WBB and HHD are two affordable devices to assess isometric shoulder strength.

Original languageEnglish
JournalShoulder and Elbow
Publication statusAccepted/In press - 2022


  • isometric
  • Reliability
  • shoulder
  • strength
  • upper extremity

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation


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