Isometric Hand Grip Strength Measured by the Nintendo Wii Balance Board

A Reliable New Method

A. W. Blomkvist; S. Andersen; E. D. de Bruin; M. G. Jorgensen


BMC Musculoskelet Disord. 2016;17(56) 

In This Article


The study-population consisted of 18 women and 12 men with a mean age of 69 ± 4.2 years. Characteristics included height 168.5 ± 6.9 cm, weight 72.5 ± 13.7 kg, BMI 25.5 ± 4.2 kg/m2, number of medications 1.5 ± 1.7, while physical activity was 8.1 ± 3.5 hours per week. Two participants did not show up for session two. Their results were excluded for the reproducibility analysis, while their measurements from the first session were retained for the validity analysis.

In Fig. 3, the mean value for three measurements is shown for the WBB on both sessions and the JD. The between-subjects variation is greater than the within-subject variation. Also, the JD reads on average higher values than the WBB. Post hoc analysis using the mean score of three measurements from the first session demonstrates an average difference of 15.4 ± 5.5 kg for the dominant hand and 11.9 ± 5.5 kg for the non-dominant hand with the JD giving higher values.

Figure 3.

Mean of three measurements for the WBB on both sessions and for the JD. Vertical axis shows the results in kilogram. Horizontal axis represents each participant. Results from two participants, who did not show up for second session, are omitted (no 16 and 18)

Reproducibility results for dominant and non-dominant hands are shown in Table 1 and Table 2, respectively. ICC values were 0.948–0.976, SEM between 0.2 and 0.5 kg and LOA were between 2.7 and 4.2 kg across all measurements. There were no statistically significant differences between sessions one and two, and there were no visual signs of heteroscedasticity.

Validity results are shown in Table 3 and Table 4. The Pearson correlations between WBB and JD for all measurements were between 0.80 and 0.88 with the differences being statistically significant, and ICC values were between 0.793 and 0.803.