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Papers by roxy chiu

Research paper thumbnail of A longitudinal shear wave elastogram (upper) and the corresponding grey scale sonogram (lower) show an Achilles tendon on the non-dominant leg of a subject before stretching exercise

<p>Four Q-boxes with a diameter of 3 mm were placed along the long axis of tendon for the m... more <p>Four Q-boxes with a diameter of 3 mm were placed along the long axis of tendon for the measurement of tendon stiffness. Different stiffness parameters are shown on the right side of the image.</p

Research paper thumbnail of A longitudinal shear wave elastogram (upper) and the corresponding grey scale sonogram (lower) show the same Achilles tendon as in Fig 2 of the subject after stretching exercise

Research paper thumbnail of A transverse grey scale sonogram of Achilles tendon shows the measurement of the thickness (caliber +) and cross-sectional area (caliber ×) of the tendon

<p>A transverse grey scale sonogram of Achilles tendon shows the measurement of the thickne... more <p>A transverse grey scale sonogram of Achilles tendon shows the measurement of the thickness (caliber +) and cross-sectional area (caliber ×) of the tendon.</p

Research paper thumbnail of Effect of static stretching on Achilles tendon morphology and stiffness

<p>Effect of static stretching on Achilles tendon morphology and stiffness.</p

Research paper thumbnail of An Investigation of the Immediate Effect of Static Stretching on the Morphology and Stiffness of Achilles Tendon in Dominant and Non-Dominant Legs

PLOS ONE, 2016

This study was undertaken to investigate the immediate effect of static stretching on normal Achi... more This study was undertaken to investigate the immediate effect of static stretching on normal Achilles tendon morphology and stiffness, and the different effect on dominant and nondominant legs; and to evaluate inter-operator and intra-operator reliability of using shearwave elastography in measuring Achilles tendon stiffness. Methods 20 healthy subjects (13 males, 7 females) were included in the study. Thickness, cross-sectional area and stiffness of Achilles tendons in both legs were measured before and after 5min static stretching using grey-scale ultrasound and shear-wave elastography. Inter-operator and intra-operator reliability of tendon stiffness measurements of six operators were evaluated. Results Result showed that there was no significant change in the thickness and cross-sectional area of Achilles tendon after static stretching in both dominant and non-dominant legs (p > 0.05). Tendon stiffness showed a significant increase in non-dominant leg (p < 0.05) but not in dominant leg (p > 0.05). The inter-operator reliability of shear-wave elastography measurements was 0.749 and the intra-operator reliability ranged from 0.751 to 0.941. Conclusion Shear-wave elastography is a useful and non-invasive imaging tool to assess the immediate stiffness change of Achilles tendon in response to static stretching with high intra-operator and inter-operator reliability.

Research paper thumbnail of An Investigation of the Immediate Effect of Static Stretching on the Morphology and Stiffness of Achilles Tendon in Dominant and Non-Dominant Legs

PloS one, 2016

This study was undertaken to investigate the immediate effect of static stretching on normal Achi... more This study was undertaken to investigate the immediate effect of static stretching on normal Achilles tendon morphology and stiffness, and the different effect on dominant and non-dominant legs; and to evaluate inter-operator and intra-operator reliability of using shear-wave elastography in measuring Achilles tendon stiffness. 20 healthy subjects (13 males, 7 females) were included in the study. Thickness, cross-sectional area and stiffness of Achilles tendons in both legs were measured before and after 5-min static stretching using grey-scale ultrasound and shear-wave elastography. Inter-operator and intra-operator reliability of tendon stiffness measurements of six operators were evaluated. Result showed that there was no significant change in the thickness and cross-sectional area of Achilles tendon after static stretching in both dominant and non-dominant legs (p > 0.05). Tendon stiffness showed a significant increase in non-dominant leg (p < 0.05) but not in dominant leg...

Research paper thumbnail of A longitudinal shear wave elastogram (upper) and the corresponding grey scale sonogram (lower) show an Achilles tendon on the non-dominant leg of a subject before stretching exercise

<p>Four Q-boxes with a diameter of 3 mm were placed along the long axis of tendon for the m... more <p>Four Q-boxes with a diameter of 3 mm were placed along the long axis of tendon for the measurement of tendon stiffness. Different stiffness parameters are shown on the right side of the image.</p

Research paper thumbnail of A longitudinal shear wave elastogram (upper) and the corresponding grey scale sonogram (lower) show the same Achilles tendon as in Fig 2 of the subject after stretching exercise

Research paper thumbnail of A transverse grey scale sonogram of Achilles tendon shows the measurement of the thickness (caliber +) and cross-sectional area (caliber ×) of the tendon

<p>A transverse grey scale sonogram of Achilles tendon shows the measurement of the thickne... more <p>A transverse grey scale sonogram of Achilles tendon shows the measurement of the thickness (caliber +) and cross-sectional area (caliber ×) of the tendon.</p

Research paper thumbnail of Effect of static stretching on Achilles tendon morphology and stiffness

<p>Effect of static stretching on Achilles tendon morphology and stiffness.</p

Research paper thumbnail of An Investigation of the Immediate Effect of Static Stretching on the Morphology and Stiffness of Achilles Tendon in Dominant and Non-Dominant Legs

PLOS ONE, 2016

This study was undertaken to investigate the immediate effect of static stretching on normal Achi... more This study was undertaken to investigate the immediate effect of static stretching on normal Achilles tendon morphology and stiffness, and the different effect on dominant and nondominant legs; and to evaluate inter-operator and intra-operator reliability of using shearwave elastography in measuring Achilles tendon stiffness. Methods 20 healthy subjects (13 males, 7 females) were included in the study. Thickness, cross-sectional area and stiffness of Achilles tendons in both legs were measured before and after 5min static stretching using grey-scale ultrasound and shear-wave elastography. Inter-operator and intra-operator reliability of tendon stiffness measurements of six operators were evaluated. Results Result showed that there was no significant change in the thickness and cross-sectional area of Achilles tendon after static stretching in both dominant and non-dominant legs (p > 0.05). Tendon stiffness showed a significant increase in non-dominant leg (p < 0.05) but not in dominant leg (p > 0.05). The inter-operator reliability of shear-wave elastography measurements was 0.749 and the intra-operator reliability ranged from 0.751 to 0.941. Conclusion Shear-wave elastography is a useful and non-invasive imaging tool to assess the immediate stiffness change of Achilles tendon in response to static stretching with high intra-operator and inter-operator reliability.

Research paper thumbnail of An Investigation of the Immediate Effect of Static Stretching on the Morphology and Stiffness of Achilles Tendon in Dominant and Non-Dominant Legs

PloS one, 2016

This study was undertaken to investigate the immediate effect of static stretching on normal Achi... more This study was undertaken to investigate the immediate effect of static stretching on normal Achilles tendon morphology and stiffness, and the different effect on dominant and non-dominant legs; and to evaluate inter-operator and intra-operator reliability of using shear-wave elastography in measuring Achilles tendon stiffness. 20 healthy subjects (13 males, 7 females) were included in the study. Thickness, cross-sectional area and stiffness of Achilles tendons in both legs were measured before and after 5-min static stretching using grey-scale ultrasound and shear-wave elastography. Inter-operator and intra-operator reliability of tendon stiffness measurements of six operators were evaluated. Result showed that there was no significant change in the thickness and cross-sectional area of Achilles tendon after static stretching in both dominant and non-dominant legs (p > 0.05). Tendon stiffness showed a significant increase in non-dominant leg (p < 0.05) but not in dominant leg...

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