NDLI: Can measures of muscle–tendon interaction improve our understanding of the superiority of Kenyan endurance runners?

Content Provider	Springer Nature Link
Author	Sa, Kanae Nicol, Caroline Akiyama, Masabu Kunimasa, Yoko Oda, Toshiaki Ito, Akira Locatelli, Elio Komi, Paavo V. Ishikawa, Masaki
Copyright Year	2014
Abstract	Leg muscle activation profiles and muscle–tendon interaction were studied with eleven internationally high-level Kenyan and eleven national level Japanese distance runners.Ultrasonography and kinematics were applied together with surface electromyography (EMG) recordings of leg muscles when subjects ran on treadmill at 9.0 (SLOW) and 13.9 km h−1 (MEDIUM).At each speed, both groups presented similar contact and flight times. The kinematic and ultrasound analyses revealed that, in contrast to the Japanese runners, the Kenyans demonstrated during contact smaller stretching and shortening amplitudes (p < 0.01) of the tendinous tissue of medial gastrocnemius (MG), but greater tendon contribution to the muscle–tendon unit shortening (p < 0.05). The MG fascicles of the Kenyans were shorter not only at the resting standing position, but also during the contact phase at both running speeds (p < 0.01). The EMG profiles of the Kenyans showed lower braking/preactivation ratio in both MG and tibialis anterior (p < 0.05) muscles. They were also characterized by negative relationships between the Achilles tendon moment arm and the MG fascicle shortening during contact (r = −0.54, p < 0.01). In contrast, the Japanese presented the classical stretch–shortening cycle muscle activation profile of relatively high MG EMG activity during the braking phase.These findings provide new suggestions that the Kenyans have unique structural characteristics which can result in the reduction of muscle and tendinous stretch–shortening loading together with smaller muscle activation during contact at submaximal running speed.
Starting Page	849
Ending Page	859
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	115
Issue Number	4
e-ISSN	14396327
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-12-05
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ultrasonography Muscle–tendon interaction Endurance running Kenya Human Physiology Occupational Medicine/Industrial Medicine Sports Medicine
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Muscle–tendon interaction and EMG profiles of world class endurance runners during hopping

Relationship between elastic properties of tendon structures and performance in long distance runners

Skeletal muscle telomere length in healthy, experienced, endurance runners

Exercise-induced changes in triceps surae tendon stiffness and muscle strength affect running economy in humans

Acute changes in muscle activation and leg extension performance after different running exercises in elite long distance runners

Effects of mechanical properties of muscle and tendon on performance in long distance runners

Muscle mechanical characteristics in fatigue and recovery from a marathon race in highly trained runners

Runners maintain locomotor–respiratory coupling following isocapnic voluntary hyperpnea to task failure

Expiratory muscle fatigue impairs exercise performance

Can measures of muscle–tendon interaction improve our understanding of the superiority of Kenyan endurance runners?

Similar Documents

Muscle–tendon interaction and EMG profiles of world class endurance runners during hopping

Relationship between elastic properties of tendon structures and performance in long distance runners

Skeletal muscle telomere length in healthy, experienced, endurance runners

Exercise-induced changes in triceps surae tendon stiffness and muscle strength affect running economy in humans

Acute changes in muscle activation and leg extension performance after different running exercises in elite long distance runners

Effects of mechanical properties of muscle and tendon on performance in long distance runners

Muscle mechanical characteristics in fatigue and recovery from a marathon race in highly trained runners

Runners maintain locomotor–respiratory coupling following isocapnic voluntary hyperpnea to task failure

Expiratory muscle fatigue impairs exercise performance

Can measures of muscle–tendon interaction improve our understanding of the superiority of Kenyan endurance runners?