Time to peak torque and acceleration time are altered in male patients following traumatic shoulder instability

Jin Hyuck Lee, Ji Soon Park, Hyun Jung Hwang, Woong-Kyo Jeong

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Background: Numerous authors have evaluated the strength of the rotator cuff muscles in patients with shoulder instability. However, only limited data are available with regard to neuromuscular control in patients with traumatic anterior shoulder instability, in particular at 90° of abduction. This study was designed to assess muscle strength and neuromuscular control ability using time to peak torque and acceleration time in nonathletic patients with traumatic anterior shoulder instability. Methods: Isokinetic muscle performance testing was performed in 20 male nonathletic anterior shoulder instability patients compared with 20 side-matched asymptomatic volunteers. Isokinetic muscle performance testing was performed at an angular velocity of 180°/s with 90° of shoulder abduction. Muscle strength and neuromuscular control (time to peak torque and acceleration time) of the internal rotators (IRs) and external rotators (ERs) were measured. Results: There were no significant differences in muscle strength of the IRs and ERs between the 2 groups. The injured shoulder showed delayed neuromuscular control in both the IRs and ERs in the instability patients compared with the normal control subjects (time to peak torque, P =.023 for IRs and P =.020 for ERs; acceleration time, P =.035 for IRs and P =.021 for ERs). Conclusion: The neuromuscular control of both the IRs and ERs was decreased in male nonathletic patients with traumatic anterior shoulder instability even though muscle strength was not altered. Therefore, clinicians and therapists should implement exercises that aim to restore neuromuscular control in the rehabilitation of nonathletic patients with anterior shoulder instability.

Original languageEnglish
Pages (from-to)1505-1511
Number of pages7
JournalJournal of Shoulder and Elbow Surgery
Volume27
Issue number8
DOIs
Publication statusPublished - 2018 Aug 1

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Torque
Muscle Strength
Muscles
Rotator Cuff
Volunteers
Rehabilitation
Exercise

Keywords

  • Anterior instability
  • Basic Science Study
  • isokinetic
  • Kinetics
  • muscle strength
  • neuromuscular control
  • rehabilitation
  • rotator cuff

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

Time to peak torque and acceleration time are altered in male patients following traumatic shoulder instability. / Lee, Jin Hyuck; Park, Ji Soon; Hwang, Hyun Jung; Jeong, Woong-Kyo.

In: Journal of Shoulder and Elbow Surgery, Vol. 27, No. 8, 01.08.2018, p. 1505-1511.

Research output: Contribution to journalArticle

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N2 - Background: Numerous authors have evaluated the strength of the rotator cuff muscles in patients with shoulder instability. However, only limited data are available with regard to neuromuscular control in patients with traumatic anterior shoulder instability, in particular at 90° of abduction. This study was designed to assess muscle strength and neuromuscular control ability using time to peak torque and acceleration time in nonathletic patients with traumatic anterior shoulder instability. Methods: Isokinetic muscle performance testing was performed in 20 male nonathletic anterior shoulder instability patients compared with 20 side-matched asymptomatic volunteers. Isokinetic muscle performance testing was performed at an angular velocity of 180°/s with 90° of shoulder abduction. Muscle strength and neuromuscular control (time to peak torque and acceleration time) of the internal rotators (IRs) and external rotators (ERs) were measured. Results: There were no significant differences in muscle strength of the IRs and ERs between the 2 groups. The injured shoulder showed delayed neuromuscular control in both the IRs and ERs in the instability patients compared with the normal control subjects (time to peak torque, P =.023 for IRs and P =.020 for ERs; acceleration time, P =.035 for IRs and P =.021 for ERs). Conclusion: The neuromuscular control of both the IRs and ERs was decreased in male nonathletic patients with traumatic anterior shoulder instability even though muscle strength was not altered. Therefore, clinicians and therapists should implement exercises that aim to restore neuromuscular control in the rehabilitation of nonathletic patients with anterior shoulder instability.

AB - Background: Numerous authors have evaluated the strength of the rotator cuff muscles in patients with shoulder instability. However, only limited data are available with regard to neuromuscular control in patients with traumatic anterior shoulder instability, in particular at 90° of abduction. This study was designed to assess muscle strength and neuromuscular control ability using time to peak torque and acceleration time in nonathletic patients with traumatic anterior shoulder instability. Methods: Isokinetic muscle performance testing was performed in 20 male nonathletic anterior shoulder instability patients compared with 20 side-matched asymptomatic volunteers. Isokinetic muscle performance testing was performed at an angular velocity of 180°/s with 90° of shoulder abduction. Muscle strength and neuromuscular control (time to peak torque and acceleration time) of the internal rotators (IRs) and external rotators (ERs) were measured. Results: There were no significant differences in muscle strength of the IRs and ERs between the 2 groups. The injured shoulder showed delayed neuromuscular control in both the IRs and ERs in the instability patients compared with the normal control subjects (time to peak torque, P =.023 for IRs and P =.020 for ERs; acceleration time, P =.035 for IRs and P =.021 for ERs). Conclusion: The neuromuscular control of both the IRs and ERs was decreased in male nonathletic patients with traumatic anterior shoulder instability even though muscle strength was not altered. Therefore, clinicians and therapists should implement exercises that aim to restore neuromuscular control in the rehabilitation of nonathletic patients with anterior shoulder instability.

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