Influence of time of day on tendon compliance and estimations of voluntary activation levels

Muscle & Nerve
Stephen J Pearson, Gladys N L Onambele

Abstract

We investigated the importance of tendon stiffness on estimations of central activation capacity (CAC). Patella tendon-force elongation relationship, quadriceps torque, and response to 50-micros, 100-HZ electrical twitch doublets were studied at approximately 8:00 A.M. and approximately 6:00 P.M. in 8 healthy young men. Results show that in the evening, as compared with the morning, tendon stiffness decreased by 20.2 +/- 9.5% (P = 0.03) and time to twitch peak (Ttp) increased by 55% (P = 0.04). Tendon stiffness and Ttp correlated significantly (r = 0.28, P < 0.05). Whereas the CAC, calculated as the ratio of force preceding the interpolated twitch (IT) to the total force at the peak of the IT, showed no change with time of day, calculations that used twitch ratios suggested CAC decrements (-10.3%, P = 0.03, unpotentiated; -10%, P = 0.02, potentiated ratio) in the evening. This study shows that CAC estimations are invalid when tendon properties are not taken into account, an error that would have important implications in a clinical setting.

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Citations

Aug 22, 2009·Journal of Applied Physiology·Xiping ZhangKaryn A Esser
Nov 18, 2009·Journal of Strength and Conditioning Research·Katherine E BurgessGladys L Onambélé
Sep 27, 2012·Sports Medicine·Stephen John Pearson, John McMahon
Jan 7, 2014·Medicine and Science in Sports and Exercise·Stephen J PearsonAzlan S A Mohamed
Mar 20, 2014·European Journal of Applied Physiology·Brandon Paul FosterAlun G Williams
May 20, 2014·Sports Medicine·Stephen John Pearson, Syed Robiul Hussain
Jul 6, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Vytautas StreckisGediminas Mamkus
Aug 30, 2014·European Journal of Applied Physiology·Brandon Paul FosterAlun G Williams
Oct 18, 2012·Medicine and Science in Sports and Exercise·Nicole L GriggJames E Smeathers
Jan 21, 2016·Chronobiology International·Thierry PaillardLola Debove
Nov 4, 2008·Journal of Biomechanics·Gladys L OnambéléMarco V Narici
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Jun 15, 2007·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Gladys N L OnambéléStephen J Pearson
Apr 10, 2007·Clinical Biomechanics·Stephen J PearsonGladys N L Onambele
May 23, 2018·PloS One·Gerard McMahonGladys L Onambélé
Aug 20, 2016·F1000Research·Somik Chatterjee, Ke Ma
Dec 21, 2018·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·Mahdi Al-QahtaniRavish Javed
Feb 2, 2012·Journal of the International Society of Sports Nutrition·David Houghton, Gladys L Onambele
Dec 25, 2016·Acta orthopaedica et traumatologica turcica·Serkan TaşFeza Korkusuz
Mar 30, 2019·European Journal of Applied Physiology·Ching-Yan Chloé YeungMichael Kjær

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