Table 3. P values of the Wilcoxon test of the comparison between the measures from morning (MO) and late afternoon (LA), R values of the Spearman correlation (morning with late afternoon), and the amount of the variances explained by the time of the day (morning, lunch or late afternoon), by differences between the individuals and by their interactions (median and 95% confidence intervals determined by bootstrap analysis) for the parameters of trapezius muscle activity (EMG), the parameters of arm acceleration (ACC), and the heart rate (HR).
| Percentage of variance explained by differences | |||||
|---|---|---|---|---|---|
| Parameter | P (MO-LA) |
R (MO-LA) |
between subjects [%] | in time [%] | Subject x time [%] |
| EMG, rest time | 0.81 | 0.72** | 78% (54%/91%) | 1% (0%/10%) | 20% (9%/42%) |
| EMG, 10th percentile | 0.16 | 0.67* | 73% (42%/88%) | 3% (0%/11%) | 24% (9%/53%) |
| EMG, 50th percentile | 0.94 | 0.86*** | 67% (41%/90%) | 2% (0%/16%) | 30% (9%/50%) |
| EMG, 90th percentile | 0.33 | 0.70* | 82% (50%/94%) | 2% (0%/12%) | 15% (6%/41%) |
| ACC, rest time | 0.72 | 0.25 | 61% (25%/79%) | 4% (0%/25%) | 33% (19%/60%) |
| ACC, 10th percentile | 0.33 | 0.43 | 74% (54%/78%) | 2% (0%/17%) | 25% (17%/36%) |
| ACC, 90th percentile | 0.75 | 0.50 | 25% (16%/37%) | 23% (5%/43%) | 51% (32%/71%) |
| HR, 50th percentile | 0.79 | 0.81** | 92% (82%/96%) | 1% (0%/6%) | 7% (4%/14%) |