2002 Volume 2 Pages 73-81
The purpose of this study was to examine the reliability of exertion patterns in vertical ground reaction force (GRF), electromyogram (EMG) and stand parameters during a stand movement from a chair. The subjects stood from different height chairs, which corresponded to their lower leg length. Ten healthy young males (age 23.0 ± 2.10 yr, height 174.9 ± 4.23 cm, weight 73.0 ± 13.79 kg, lower leg length 45.9 ± 1.71 cm) were selected. Twenty-eight parameters (GRF: 18, EMG: 10) were selected to evaluate the stand movement.
Each cross correlation between two trials of exertion pattern in GRF and EMG was very high (No work load: GRF; r =0.938-0.999, EMG; r = 0.731-0.999; Work load: GRF; r = 0.959-0.998, EMG; r = 0.726-0.999).
The interclass correlation coefficient (ICC) of stand parameters of GRF and EMG were 0.913 ± 0.119 and 0.949 ± 0.109 with no work load, and 0.776 ± 0.221 and 0.886 ± 0.221 with work load, respectively (ICC = Mean ± SD).
From the above, the reliability of exertion patterns in GRF and EMG at each condition was very high. Because almost ICCs in stand parameters were high (ICC 0.75) and little significant difference between two trials was observed, we judged that the reliability of stand parameters was acceptable. However, some parameters with lower reliability were observed in the beginning and completion phases of stand movement with a work load condition.
The reliability of exertion patterns of GRF, EMG and stand parameters during a stand movement was mostly high. Therefore, the possibility of further examination was suggested.
