The effects of orthotic heel lifts on Achilles tendon force and strain during running

Farris, Dominic James, Buckeridge, Erica, Trewartha, Grant and McGuigan, Miranda Polly (2012) The effects of orthotic heel lifts on Achilles tendon force and strain during running. Journal of Applied Biomechanics, 28 5: 511-519.

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Name Description MIMEType Size Downloads
Author Farris, Dominic James
Buckeridge, Erica
Trewartha, Grant
McGuigan, Miranda Polly
Title The effects of orthotic heel lifts on Achilles tendon force and strain during running
Journal name Journal of Applied Biomechanics   Check publisher's open access policy
ISSN 1065-8483
1543-2688
Publication date 2012-11
Sub-type Article (original research)
Volume 28
Issue 5
Start page 511
End page 519
Total pages 9
Place of publication Champaign, IL, United States
Publisher Human Kinetics
Collection year 2013
Language eng
Formatted abstract
This study assessed the effects of orthotic heel lifts on Achilles tendon (AT) force and strain during running. Ten females ran barefoot over a force plate in three conditions: no heel lifts (NHL), with 12 mm heel lifts (12HL) and with 18 mm heel lifts (18HL). Kinematics for the right lower limb were collected (200 Hz). AT force was calculated from inverse dynamics. AT strain was determined from kinematics and ultrasound images of medial gastrocnemius (50 Hz). Peak AT strain was less for 18HL (5.5 ± 4.4%) than for NHL (7.4 ± 4.2%) (p = .029, effect size [ES] = 0.44) but not for 12HL (5.8 ± 4.8%) versus NHL (ES = 0.35). Peak AT force was significantly (p = .024, ES = 0.42) less for 18HL (2382 ± 717 N) than for NHL (2710 ± 830 N) but not for 12HL (2538 ± 823 N, ES = 0.21). The 18HL reduced ankle dorsiflexion but not flexion-extension ankle moments and increased the AT moment arm compared with NHL. Thus, 18HL reduced force and strain on the AT during running via a reduction in dorsiflexion, which lengthened the AT moment arm. Therefore, heel lifts could be used to reduce AT loading and strain during the rehabilitation of AT injuries.
Keyword Injury
Muscle mechanics
Ultrasound
Rehabilitation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Human Movement and Nutrition Sciences Publications
 
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