Positive Work Contribution Shifts from Distal to Proximal Joints during a Prolonged Run

Journal article

Sanno, M, Willwacher, S, Epro, G and Brüggemann, G-P (2018). Positive Work Contribution Shifts from Distal to Proximal Joints during a Prolonged Run. Medicine and Science in Sports and Exercise. 50 (12), pp. 2507-2517. https://doi.org/10.1249/MSS.0000000000001707
AuthorsSanno, M, Willwacher, S, Epro, G and Brüggemann, G-P
Abstract

PURPOSE: To investigate the joint-specific contributions to the total lower extremity joint work during a prolonged fatiguing run. METHODS: Recreational long-distance runners (RR; n = 13) and competitive long-distance runners (CR; n = 12) performed a 10-km treadmill run with near-maximal effort. A three-dimensional motion capture system synchronized with a force-instrumented treadmill was used to calculate joint kinetics and kinematics of the lower extremity in the sagittal plane during the stance phase at 13 distance points over the 10-km run. RESULTS: A significant (P < 0.05) decrease of positive ankle joint work as well as an increase of positive knee and hip joint work was found. These findings were associated with a redistribution of the individual contributions to total lower extremity work away from the ankle towards the knee and hip joint which was more distinctive in the RR group than in the CR group. This redistribution was accomplished by significant (P < 0.05) reductions of the external ground-reaction force (GRF) lever arm and joint torque at the ankle and by the significant (P < 0.05) increase of the external GRF lever arm and joint torque at the knee and hip. CONCLUSION: The redistribution of joint work from the ankle to more proximal joints might be a biomechanical mechanism that could partly explain the decreased running economy in a prolonged fatiguing run. This might be because muscle-tendon units crossing proximal joints are less equipped for energy storage and return compared to ankle plantar flexors and require greater muscle volume activation for a given force. In order to improve running performance, long-distance runners may benefit from an exercise-induced enhancement of ankle plantar flexor muscle-tendon unit capacities.

Keywords1106 Human Movement And Sports Science; Sport Sciences
Year2018
JournalMedicine and Science in Sports and Exercise
Journal citation50 (12), pp. 2507-2517
PublisherAmerican College of Sports Medicine
ISSN1530-0315
Digital Object Identifier (DOI)https://doi.org/10.1249/MSS.0000000000001707
Publication dates
Print01 Dec 2018
Publication process dates
Deposited22 Sep 2018
Accepted25 Jun 2018
Accepted author manuscript
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Open
Additional information

This is the accepted author manuscript of an article published by Lippincott, Williams & Wilkins in Medicine and Science in Sport and Exercise. The full version can be viewed at doi: 10.1249/MSS.0000000000001707

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