Localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises

S. Maeo, A. Saito, S. Otsuka, X. Shan, H. Kanehisa, Yasuo Kawakami

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This study examined localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises by using transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI). Thirty-three young males performed either of the following three exercises: single-joint eccentric contraction of the knee extensors (KE), eccentric squat (S), or downhill walking (DW) (n=11/exercise). KE and S consisted of 5-set×10-lowering of 90% one-repetition maximum load. DW was performed for 60 minutes with -10% slope, 6 km/h velocity, and 20% body mass load carried. At pre- and 24-, 48-, and 72-hours post-exercise, T2-MRI was scanned and T2 values for the rectus femoris (RF), vastus intermedius (VI), vastus lateralis (VL), and vastus medialis (VM) at proximal, middle, and distal sites were calculated. Additionally, soreness felt when static pressure was applied to these sites and maximal isometric knee extension torque were measured. Maximal torque significantly (P<.05) decreased (7%-15%) at 24-48 hours after all exercises. T2 significantly increased (3%-9%) at 24-72 hours after all exercises, with heterogeneities within the muscles found in each exercise. Effect size and peak change of T2, as well as soreness, overall indicated that the proximal RF after KE and middle VM after S and DW were most affected by these exercises. The VL did not show any significant T2 increase after all exercises. These results suggest that muscle damage specifically localizes at the proximal RF by KE and at the middle VM by S and DW, while the VL is least damaged regardless of the exercises.

Original languageEnglish
JournalScandinavian Journal of Medicine and Science in Sports
DOIs
Publication statusAccepted/In press - 2017

Fingerprint

Quadriceps Muscle
Muscles
Knee
Walking
Torque
Magnetic Resonance Imaging
Joints
Pressure

Keywords

  • Downhill walking
  • Knee extension
  • Maximal strength
  • Muscle soreness
  • Squat
  • T-MRI

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises. / Maeo, S.; Saito, A.; Otsuka, S.; Shan, X.; Kanehisa, H.; Kawakami, Yasuo.

In: Scandinavian Journal of Medicine and Science in Sports, 2017.

Research output: Contribution to journalArticle

@article{d95e9b3aa76d4432ba7dab0c31270066,
title = "Localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises",
abstract = "This study examined localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises by using transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI). Thirty-three young males performed either of the following three exercises: single-joint eccentric contraction of the knee extensors (KE), eccentric squat (S), or downhill walking (DW) (n=11/exercise). KE and S consisted of 5-set×10-lowering of 90{\%} one-repetition maximum load. DW was performed for 60 minutes with -10{\%} slope, 6 km/h velocity, and 20{\%} body mass load carried. At pre- and 24-, 48-, and 72-hours post-exercise, T2-MRI was scanned and T2 values for the rectus femoris (RF), vastus intermedius (VI), vastus lateralis (VL), and vastus medialis (VM) at proximal, middle, and distal sites were calculated. Additionally, soreness felt when static pressure was applied to these sites and maximal isometric knee extension torque were measured. Maximal torque significantly (P<.05) decreased (7{\%}-15{\%}) at 24-48 hours after all exercises. T2 significantly increased (3{\%}-9{\%}) at 24-72 hours after all exercises, with heterogeneities within the muscles found in each exercise. Effect size and peak change of T2, as well as soreness, overall indicated that the proximal RF after KE and middle VM after S and DW were most affected by these exercises. The VL did not show any significant T2 increase after all exercises. These results suggest that muscle damage specifically localizes at the proximal RF by KE and at the middle VM by S and DW, while the VL is least damaged regardless of the exercises.",
keywords = "Downhill walking, Knee extension, Maximal strength, Muscle soreness, Squat, T-MRI",
author = "S. Maeo and A. Saito and S. Otsuka and X. Shan and H. Kanehisa and Yasuo Kawakami",
year = "2017",
doi = "10.1111/sms.12880",
language = "English",
journal = "Scandinavian Journal of Medicine and Science in Sports",
issn = "0905-7188",
publisher = "Blackwell Munksgaard",

}

TY - JOUR

T1 - Localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises

AU - Maeo, S.

AU - Saito, A.

AU - Otsuka, S.

AU - Shan, X.

AU - Kanehisa, H.

AU - Kawakami, Yasuo

PY - 2017

Y1 - 2017

N2 - This study examined localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises by using transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI). Thirty-three young males performed either of the following three exercises: single-joint eccentric contraction of the knee extensors (KE), eccentric squat (S), or downhill walking (DW) (n=11/exercise). KE and S consisted of 5-set×10-lowering of 90% one-repetition maximum load. DW was performed for 60 minutes with -10% slope, 6 km/h velocity, and 20% body mass load carried. At pre- and 24-, 48-, and 72-hours post-exercise, T2-MRI was scanned and T2 values for the rectus femoris (RF), vastus intermedius (VI), vastus lateralis (VL), and vastus medialis (VM) at proximal, middle, and distal sites were calculated. Additionally, soreness felt when static pressure was applied to these sites and maximal isometric knee extension torque were measured. Maximal torque significantly (P<.05) decreased (7%-15%) at 24-48 hours after all exercises. T2 significantly increased (3%-9%) at 24-72 hours after all exercises, with heterogeneities within the muscles found in each exercise. Effect size and peak change of T2, as well as soreness, overall indicated that the proximal RF after KE and middle VM after S and DW were most affected by these exercises. The VL did not show any significant T2 increase after all exercises. These results suggest that muscle damage specifically localizes at the proximal RF by KE and at the middle VM by S and DW, while the VL is least damaged regardless of the exercises.

AB - This study examined localization of muscle damage within the quadriceps femoris induced by different types of eccentric exercises by using transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI). Thirty-three young males performed either of the following three exercises: single-joint eccentric contraction of the knee extensors (KE), eccentric squat (S), or downhill walking (DW) (n=11/exercise). KE and S consisted of 5-set×10-lowering of 90% one-repetition maximum load. DW was performed for 60 minutes with -10% slope, 6 km/h velocity, and 20% body mass load carried. At pre- and 24-, 48-, and 72-hours post-exercise, T2-MRI was scanned and T2 values for the rectus femoris (RF), vastus intermedius (VI), vastus lateralis (VL), and vastus medialis (VM) at proximal, middle, and distal sites were calculated. Additionally, soreness felt when static pressure was applied to these sites and maximal isometric knee extension torque were measured. Maximal torque significantly (P<.05) decreased (7%-15%) at 24-48 hours after all exercises. T2 significantly increased (3%-9%) at 24-72 hours after all exercises, with heterogeneities within the muscles found in each exercise. Effect size and peak change of T2, as well as soreness, overall indicated that the proximal RF after KE and middle VM after S and DW were most affected by these exercises. The VL did not show any significant T2 increase after all exercises. These results suggest that muscle damage specifically localizes at the proximal RF by KE and at the middle VM by S and DW, while the VL is least damaged regardless of the exercises.

KW - Downhill walking

KW - Knee extension

KW - Maximal strength

KW - Muscle soreness

KW - Squat

KW - T-MRI

UR - http://www.scopus.com/inward/record.url?scp=85017519264&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85017519264&partnerID=8YFLogxK

U2 - 10.1111/sms.12880

DO - 10.1111/sms.12880

M3 - Article

JO - Scandinavian Journal of Medicine and Science in Sports

JF - Scandinavian Journal of Medicine and Science in Sports

SN - 0905-7188

ER -