Simultaneous knee extensor muscle action induces an increase in voluntary force generation of plantar flexor muscles

Takahito Suzuki, Kohei Shioda, Ryuta Kinugasa, Senshi Fukashiro

Research output: Contribution to journalArticle

Abstract

Maximum activation of the plantar flexor muscles is required for various sporting activities that involve simultaneous plantar flexion and knee extension. During a multi-joint movement, activation of the plantar flexor muscles is affected by the activity of the knee extensor muscles. We hypothesized that coactivation of the plantar flexor muscles and knee extensor muscles would result in a higher plantar flexion torque. To test this hypothesis, 8 male volunteers performed maximum voluntary isometric action of the plantar flexor muscles with and without isometric action of the knee extensor muscles. Surface electromyographic data were collected from 8 muscles of the right lower limb. Voluntary activation of the triceps surae muscles, evaluated using the interpolated twitch technique, significantly increased by 6.4 percentage points with intentional knee extensor action (p = 0.0491). This finding is in line with a significant increase in the average rectified value of the electromyographic activity of the vastus lateralis, fibularis longus, and soleus muscles (p = 0.013, 0.010, and 0.045, respectively). The resultant plantar flexion torque also significantly increased by 11.5% of the predetermined maximum (p = 0.031). These results suggest that higher plantar flexor activation coupled with knee extensor activation facilitates force generation during a multi-joint task.

Original languageEnglish
Pages (from-to)365-371
Number of pages7
JournalJournal of strength and conditioning research
Volume31
Issue number2
DOIs
Publication statusPublished - 2017 Feb 1
Externally publishedYes

Fingerprint

Knee
Muscles
Torque
Joints
Quadriceps Muscle
Volunteers
Lower Extremity
Skeletal Muscle

Keywords

  • coordination
  • electrical stimulation
  • maximum voluntary contraction
  • motor behavior
  • multi-joint exercise
  • quadriceps

ASJC Scopus subject areas

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

Cite this

Simultaneous knee extensor muscle action induces an increase in voluntary force generation of plantar flexor muscles. / Suzuki, Takahito; Shioda, Kohei; Kinugasa, Ryuta; Fukashiro, Senshi.

In: Journal of strength and conditioning research, Vol. 31, No. 2, 01.02.2017, p. 365-371.

Research output: Contribution to journalArticle

@article{1adcb0b06a664cee97bacf086a89c738,
title = "Simultaneous knee extensor muscle action induces an increase in voluntary force generation of plantar flexor muscles",
abstract = "Maximum activation of the plantar flexor muscles is required for various sporting activities that involve simultaneous plantar flexion and knee extension. During a multi-joint movement, activation of the plantar flexor muscles is affected by the activity of the knee extensor muscles. We hypothesized that coactivation of the plantar flexor muscles and knee extensor muscles would result in a higher plantar flexion torque. To test this hypothesis, 8 male volunteers performed maximum voluntary isometric action of the plantar flexor muscles with and without isometric action of the knee extensor muscles. Surface electromyographic data were collected from 8 muscles of the right lower limb. Voluntary activation of the triceps surae muscles, evaluated using the interpolated twitch technique, significantly increased by 6.4 percentage points with intentional knee extensor action (p = 0.0491). This finding is in line with a significant increase in the average rectified value of the electromyographic activity of the vastus lateralis, fibularis longus, and soleus muscles (p = 0.013, 0.010, and 0.045, respectively). The resultant plantar flexion torque also significantly increased by 11.5{\%} of the predetermined maximum (p = 0.031). These results suggest that higher plantar flexor activation coupled with knee extensor activation facilitates force generation during a multi-joint task.",
keywords = "coordination, electrical stimulation, maximum voluntary contraction, motor behavior, multi-joint exercise, quadriceps",
author = "Takahito Suzuki and Kohei Shioda and Ryuta Kinugasa and Senshi Fukashiro",
year = "2017",
month = "2",
day = "1",
doi = "10.1519/JSC.0000000000001513",
language = "English",
volume = "31",
pages = "365--371",
journal = "Journal of Strength and Conditioning Research",
issn = "1064-8011",
publisher = "NSCA National Strength and Conditioning Association",
number = "2",

}

TY - JOUR

T1 - Simultaneous knee extensor muscle action induces an increase in voluntary force generation of plantar flexor muscles

AU - Suzuki, Takahito

AU - Shioda, Kohei

AU - Kinugasa, Ryuta

AU - Fukashiro, Senshi

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Maximum activation of the plantar flexor muscles is required for various sporting activities that involve simultaneous plantar flexion and knee extension. During a multi-joint movement, activation of the plantar flexor muscles is affected by the activity of the knee extensor muscles. We hypothesized that coactivation of the plantar flexor muscles and knee extensor muscles would result in a higher plantar flexion torque. To test this hypothesis, 8 male volunteers performed maximum voluntary isometric action of the plantar flexor muscles with and without isometric action of the knee extensor muscles. Surface electromyographic data were collected from 8 muscles of the right lower limb. Voluntary activation of the triceps surae muscles, evaluated using the interpolated twitch technique, significantly increased by 6.4 percentage points with intentional knee extensor action (p = 0.0491). This finding is in line with a significant increase in the average rectified value of the electromyographic activity of the vastus lateralis, fibularis longus, and soleus muscles (p = 0.013, 0.010, and 0.045, respectively). The resultant plantar flexion torque also significantly increased by 11.5% of the predetermined maximum (p = 0.031). These results suggest that higher plantar flexor activation coupled with knee extensor activation facilitates force generation during a multi-joint task.

AB - Maximum activation of the plantar flexor muscles is required for various sporting activities that involve simultaneous plantar flexion and knee extension. During a multi-joint movement, activation of the plantar flexor muscles is affected by the activity of the knee extensor muscles. We hypothesized that coactivation of the plantar flexor muscles and knee extensor muscles would result in a higher plantar flexion torque. To test this hypothesis, 8 male volunteers performed maximum voluntary isometric action of the plantar flexor muscles with and without isometric action of the knee extensor muscles. Surface electromyographic data were collected from 8 muscles of the right lower limb. Voluntary activation of the triceps surae muscles, evaluated using the interpolated twitch technique, significantly increased by 6.4 percentage points with intentional knee extensor action (p = 0.0491). This finding is in line with a significant increase in the average rectified value of the electromyographic activity of the vastus lateralis, fibularis longus, and soleus muscles (p = 0.013, 0.010, and 0.045, respectively). The resultant plantar flexion torque also significantly increased by 11.5% of the predetermined maximum (p = 0.031). These results suggest that higher plantar flexor activation coupled with knee extensor activation facilitates force generation during a multi-joint task.

KW - coordination

KW - electrical stimulation

KW - maximum voluntary contraction

KW - motor behavior

KW - multi-joint exercise

KW - quadriceps

UR - http://www.scopus.com/inward/record.url?scp=85011632859&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85011632859&partnerID=8YFLogxK

U2 - 10.1519/JSC.0000000000001513

DO - 10.1519/JSC.0000000000001513

M3 - Article

VL - 31

SP - 365

EP - 371

JO - Journal of Strength and Conditioning Research

JF - Journal of Strength and Conditioning Research

SN - 1064-8011

IS - 2

ER -