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Biomechanical and Viscoelastic Properties of Achilles Tendon in Pregnant Women-Pilot Study

Investigation of Trimester-Specific Normative Values of Biomechanical and Viscoelastic Properties of Achilles Tendon in Pregnant Women-Pilot Study

Status
Completed
Phases
Unknown
Study type
Observational
Source
ClinicalTrials.gov
Registry ID
NCT05308121
Enrollment
172
Registered
2022-04-01
Start date
2022-04-01
Completion date
2024-08-01
Last updated
2025-03-24

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Pregnant Women

Keywords

pregnant women, achilles tendon, stiffness, creep

Brief summary

There is anatomical fascial continuity and functional connection between the plantar fascia, which has important roles in foot biomechanics, and the fibers of the Achilles tendon, and the change that will occur in any of these tissues is reflected in the other. However, it has not been objectively clarified how the tissue properties of the Achilles tendon, which plays an important role in foot biomechanics, such as the plantar fascia, change with pregnancy. Therefore, the aim of this pilot study is to investigate the trimester-specific biomechanical (stiffness, decrement and tone) and viscoelastic (creep and relaxation time) properties of the Achilles tendon, which adapts to changes in the foot structure during pregnancy.

Interventions

OTHEREvaluation of biomechanics and viscoelastic properties of Achilles tendon

The biomechanical and viscoelastic properties of the Achilles tendon will be measured in the side lying position. Measurements will be taken from two different points with the ankle in the neutral position.

OTHEREvaluation of foot characteristics

The mobility of foot, morphological changes of foot and foot posture will be evaluated

Sponsors

Sultan Abdulhamid Han Training and Research Hospital, Istanbul, Turkey
Lead SponsorOTHER

Study design

Observational model
OTHER
Time perspective
CROSS_SECTIONAL

Eligibility

Sex/Gender
FEMALE
Age
18 Years to 40 Years
Healthy volunteers
Yes

Inclusion criteria

* First pregnancy * They are between the ages of 18-40 * Pre-pregnancy Body-Mass-Index (BMI) \< 30 kg/m2

Exclusion criteria

* Presence of any connective tissue disease that would affect the biomechanical or viscoelastic properties of the fascia * Deterioration of skin integrity in measurement areas * Presence of orthopedic, neurological, rheumatic problems that may cause musculoskeletal disorders and deviations from normal in biomechanical alignment * History of surgery or fracture in the lower extremity and foot-ankle region in the last 6 months * Defining metabolic disorders such as type I, II diabetes, gestational diabetes mellitus (GDM), preeclampsia

Design outcomes

Primary

MeasureTime frameDescription
Evaluation of biomechanical properties of achilles tendonMeasurement the baseline stiffness values of Achilles tendon between 10-14 weeks, between 20-24 weeks and between 32-36 weeks.Measuring of the stiffness (N/m) of the achilles tendon (with MyotonPro, Myoton AS, Tallin, Estonia) in the side lying position.
Evaluation of viscoelastic properties of achilles tendonMeasurement the baseline creep values of Achilles tendon between 10-14 weeks, between 20-24 weeks and between 32-36 weeks.Measuring of the creep of the achilles tendon (with MyotonPro, Myoton AS, Tallin, Estonia) in the side lying position.

Secondary

MeasureTime frameDescription
Evaluation of foot mobilityThe measurement of the baseline navicular drop values between 10-14 weeks, between 20-24 weeks and between 32-36 weeks.Navicular drop values will be measured
Evaluation of Body WeightMeasurement the baseline body weight (kg) between 10-14 weeks, between 20-24 weeks and between 32-36 weeks.Measuring of the Body Weight
Evaluation of foot postureThe measurement of the baseline foot posturebetween 10-14 weeks, between 20-24 weeks and between 32-36 weeks.Foot posture will be evaluated according to foot posture index
Evaluation of foot morphological propertiesThe measurement of the baseline foot length between 10-14 weeks, between 20-24 weeks and between 32-36 weeks.Foot length will be measured
Evaluation of Body Mass Index (BMI)Measurement the baseline BMI values at between 10-14 weeks, between 20-24 weeks and between 32-36 weeks.BMI (kg/m2) will be calculated as person's weight in kilograms divided by the square of height in meters.

Countries

Turkey (Türkiye)

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026