Increase in muscle strength with foot orthotic use

NewsBot · Jun 22, 2007

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Effects of short-term treatment strategies over 4 weeks in Achilles tendinopathy
Frank Mayer, Anja Hirschmüller, Steffen Müller, Martin Schuberth and Heiner Baur
British Journal of Sports Medicine 2007;41:e6

Background: The therapeutic efficacy of non-surgical treatment strategies in Achilles tendinopathy (AT) has not been well clarified. Time-consuming and costly combinations of treatment for pain, physiotherapy and biomechanical procedures are often applied.

Objective: To analyse the efficacy of single therapeutic regimens commonly used over a short period of 4 weeks.

Methods: 31 male runners (mileage >32 km/week) with unilateral, untreated AT completed 4 weeks of either physiotherapy (10 treatments: deep-friction, pulsed ultrasound, ice, sensory motor training; (P)), wearing custom fit semirigid insoles (I) or remained without treatment (control group C). Before and after treatment, all patients underwent a treadmill test and a plantar flexion strength exercise. Subjective pain (Pain Disability Index, Pain Experience Scale), as well as strength performance capacity (peak torque), was analysed (mean, 95% CI, repeated measures analysis of variance, = 0.05).

Results: Pain was reduced to <50% of the baseline value after physiotherapy or after wearing insoles (p<0.05). Individual pain reduction was >50% (25%) in 89% (100%) of subjects in I and 55% (73%) in P. Higher eccentric plantar flexion peak torques after treatment were observed in I and P.

Conclusions: Most patients with AT experience a reduction in pain after only 4 weeks of differentiated, non-surgical treatment consisting of physiotherapy or semirigid insoles.
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Admin2 · Jun 22, 2007

Related thread:
Do foot orthoses weaken "arch" muscles?
Fatigue of the plantar intrinsic foot muscles increases navicular drop

Achilles tendon related threads:
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Genetic component to achilles tendon pathology
Aprotinin for Achilles tendinopathy?
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Achilles Tendonopathy orthotic
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NewsBot · Feb 8, 2008

Not exactly the foot, but splinting the back does not reduce muscle strength:

Effect of wearing a lumbar orthosis on trunk muscles: study of the muscle strength after 21days of use on healthy subjects.
Fayolle-Minon I, Calmels P.
Joint Bone Spine. 2008 Jan;75(1):58-63.

INTRODUCTION: Randomized and controlled study of clinical evaluation of medical device in healthy subjects.

OBJECTIVE: To evaluate the effect of wearing an elastic lumbar support, frequently used in low-back pain prevention or treatment, on the trunk flexors and extensors muscle strength on healthy subjects.

SUMMARY OF BACKGROUND DATA: The long-term use of a lumbar orthosis is still suspected of weakening on the trunk muscles. The results in the existing literature are contradictory but don't seem to confirm this.

METHODS: Trunk muscle isokinetic and isometric strength measured before and after the wearing of an elastic orthosis over a period of 21days by healthy subjects with a control group without orthosis.

RESULTS: There were 20 healthy subjects using orthosis and 9 controls. No changes in isokinetic and isometric strength were observed except for the endurance parameter on extensors: it was significantly more important before than after the lumbar support use (p=0.033).

CONCLUSION: These results disprove any negative effects on muscle strength and add to the existing literature which argues for a more customized prescription of lumbar orthosis depending on the potential muscle strength of the subject.
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NewsBot · Oct 2, 2019

Influence of Longitudinal Arch of Foot on the Strength and Muscle Activity of the Abductor Hallucis in Subjects with and without Navicular Drop Sign
대한물리치료학회지 2019년 31권 4호 p.222 ~ 227

Purpose: This study examined the influence of longitudinal arch on the strength and muscle activity of the abductor hallucis in the standing position in subjects with and without navicular drop signs.

Methods: A sample of 34 subjects with and without navicular drop signs between 22 and 28 years of age were enrolled in this study. The strength and muscle activity of the abductor hallucis was measured using a tensiometer. The Smart KEMA System and electromyography device was used on the subjects with and without navicular drop signs. Two groups were classified using the navicular drop test to identify the longitudinal arch of the foot. The strength of the abductor hallucis was evaluated in standing, both with and without an external arch support condition. The two-way mixed ANOVA was used. The level of statistical significance was set to α=0.05.

Results: The strength and muscle activity of the abductor hallucis in standing was significantly higher with external arch support than that without the external arch support in the group with navicular drop signs. There was no significant difference in the abductor hallucis strength and muscle activity with and without external arch support in the subjects without navicular drop signs.

Conclusions: The strength and muscle activity of the abductor hallucis in standing can be influenced by the external arch support in the group with navicular drop signs. The strength measurement of the abductor hallucis in standing should be separately performed in conditions with and without longitudinal arch of foot.
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