Research Article
The Effect of Bolus Volume on Hyoid Kinematics in Healthy Swallowing
| | Parameter | Direction/Axis | Bolus volume | Mean | 95% confidence interval | | Lower bound | Upper bound |
| | Maximum hyoid displacement versus C4 origin (in % C2–4 units) | Anterior () | 5 mL | 133% | 126% | 139% | | 10 mL | | 20 mL | | Superior () | 5 mL | 71% | 64% | 78% | | 10 mL | | 20 mL | | Hypotenuse () | 5 mL | 149% | 144% | 155% | | 10 mL | | 20 mL
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| 155% | 150% | 161% |
| Hyoid burst movement distance
(in % C2–4 units) | Anterior () | 5 mL | 36% | 33% | 39% | | 10 mL | | 20 mL | | Superior () | 5 mL | 43% | 39% | 48% | | 10 mL | | 20 mL | | Hypotenuse () | 5 mL | 49% | 46% | 52% | | 10 mL | | 20 mL |
| | Hyoid burst movement duration (ms) | Anterior () | 5 mL | 464 ms | 429 ms | 500 ms | | 10 mL | | 20 mL | | Superior () | 5 mL | 439 ms | 409 ms | 468 ms | | 10 mL | | 20 mL | | Hypotenuse () | 5 mL | 454 ms | 418 ms | 490 ms | | 10 mL | | 20 mL |
| | Hyoid burst movement velocity (mm/s) | Anterior () | 5 mL | 37 mm/s | 32 mm/s | 41 mm/s | | 10 mL | | 20 mL | | Superior () | 5 mL | 29 mm/s | 25 mm/s | 33 mm/s | | 10 mL | | 20 mL | | Hypotenuse () | 5 mL | 49 mm/s | 45 mm/s | 53 mm/s | | 10 mL | | 20 mL |
| | Hyoid burst peak velocity (mm/s) | Anterior () | 5 mL | 154 mm/s | 141 mm/s | 167 mm/s | | 10 mL | | 20 mL | | Superior () | 5 mL | 89 mm/s | 78 mm/s | 100 mm/s | | 10 mL | 99 mm/s | 88 mm/s | 110 mm/s | | 20 mL
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| 113 mm/s | 101 mm/s | 124 mm/s | | Hypotenuse () | 5 mL | 167 mm/s | 154 mm/s | 179 mm/s | | 10 mL | | 20 mL |
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Statistical significance at a -value of < 0.05.
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