María Hjálmdís Þorsteinsdóttir - Academia.edu (original) (raw)
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Papers by María Hjálmdís Þorsteinsdóttir
Journal of Neurophysiology, 1999
The purpose of this study was to test the hypothesis whether weight transfer during sit-to-stand ... more The purpose of this study was to test the hypothesis whether weight transfer during sit-to-stand (STS) is the result of coordinated ground forces exerted by buttocks and feet before seat-off. Whole-body kinematics and three-dimensional ground forces from left and right buttock as well as from left and right foot were recorded for seven adults during STS. We defined a preparatory phase from onset of the first detectable anterior/posterior (A/P) force to seat-off (buttock forces fell to 0) and a rising phase from seat-off to the decrease of center of mass (CoM) vertical velocity to zero. STS was induced by an increase of vertical and backward directed ground forces exerted by the buttocks that significantly preceded the onset of any trunk movement. All ground forces peaked before or around the moment of seat-off, whereas all kinematic variables, except trunk forward rotation and hip flexion, peaked after seat-off, during or after the rising phase. The present study suggests that the w...
Journal of Manual & Manipulative Therapy, 2007
The purpose of this pilot study was to examine the immediate effects of a manual therapy techniqu... more The purpose of this pilot study was to examine the immediate effects of a manual therapy technique called Inhibitive Distraction (ID) on active range of motion (AROM) for cervical fl exion in patients with neck pain with or without concomitant headache. A secondary objective of this study was to see whether patient subgroups could be identifi ed who might benefi t more from ID by studying variables such as age, pain intensity, presence of headache, or pre-intervention AROM. We also looked at patients' ability to identify pre-to post-intervention changes in their ability to actively move through a range of motion. Forty subjects (mean age 34.7 years; range 16-48 years) referred to a physical therapy clinic due to discomfort in the neck region were randomly assigned to an experimental and a control group. We used the CROM goniometer to measure pre-and post-intervention cervical fl exion AROM in the sagittal plane within a single treatment session. The between-group difference in AROM increase was not statistically signifi cant at P<0.05 with a mean post-intervention increase in ROM of 2.4° (SD 6.2°) for the experimental group and 1.2° (SD 5.8°) for the placebo group. We were also unable to identify potential subgroups more likely to respond to ID, although a trend emerged for greater improvement in chronic patients with headaches, lower pain levels, and less pre-intervention AROM. In the experimental group and in both groups combined, subjects noting increased AROM indeed had a signifi cantly greater increase in AROM than those subjects not noting improvement. In conclusion, this study did not confi rm immediate effects of ID on cervical fl exion AROM but did provide indications for potential subgroups likely to benefi t from this technique. Recommendations are provided with regard to future research and clinical use of the technique studied.
Journal of Neurophysiology, 1999
The purpose of this study was to test the hypothesis whether weight transfer during sit-to-stand ... more The purpose of this study was to test the hypothesis whether weight transfer during sit-to-stand (STS) is the result of coordinated ground forces exerted by buttocks and feet before seat-off. Whole-body kinematics and three-dimensional ground forces from left and right buttock as well as from left and right foot were recorded for seven adults during STS. We defined a preparatory phase from onset of the first detectable anterior/posterior (A/P) force to seat-off (buttock forces fell to 0) and a rising phase from seat-off to the decrease of center of mass (CoM) vertical velocity to zero. STS was induced by an increase of vertical and backward directed ground forces exerted by the buttocks that significantly preceded the onset of any trunk movement. All ground forces peaked before or around the moment of seat-off, whereas all kinematic variables, except trunk forward rotation and hip flexion, peaked after seat-off, during or after the rising phase. The present study suggests that the w...
Journal of Manual & Manipulative Therapy, 2007
The purpose of this pilot study was to examine the immediate effects of a manual therapy techniqu... more The purpose of this pilot study was to examine the immediate effects of a manual therapy technique called Inhibitive Distraction (ID) on active range of motion (AROM) for cervical fl exion in patients with neck pain with or without concomitant headache. A secondary objective of this study was to see whether patient subgroups could be identifi ed who might benefi t more from ID by studying variables such as age, pain intensity, presence of headache, or pre-intervention AROM. We also looked at patients' ability to identify pre-to post-intervention changes in their ability to actively move through a range of motion. Forty subjects (mean age 34.7 years; range 16-48 years) referred to a physical therapy clinic due to discomfort in the neck region were randomly assigned to an experimental and a control group. We used the CROM goniometer to measure pre-and post-intervention cervical fl exion AROM in the sagittal plane within a single treatment session. The between-group difference in AROM increase was not statistically signifi cant at P<0.05 with a mean post-intervention increase in ROM of 2.4° (SD 6.2°) for the experimental group and 1.2° (SD 5.8°) for the placebo group. We were also unable to identify potential subgroups more likely to respond to ID, although a trend emerged for greater improvement in chronic patients with headaches, lower pain levels, and less pre-intervention AROM. In the experimental group and in both groups combined, subjects noting increased AROM indeed had a signifi cantly greater increase in AROM than those subjects not noting improvement. In conclusion, this study did not confi rm immediate effects of ID on cervical fl exion AROM but did provide indications for potential subgroups likely to benefi t from this technique. Recommendations are provided with regard to future research and clinical use of the technique studied.