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European Journal of Applied Physiology

, Volume 119, Issue 11–12, pp 2465–2476 | Cite as

Is the joint-angle specificity of isometric resistance training real? And if so, does it have a neural basis?

  • Marcel B. LanzaEmail author
  • Thomas G. Balshaw
  • Jonathan P. Folland
Original Article

Abstract

Purpose

There are suggestions that isometric resistance training (RT) produces highly angle-specific changes in strength with the greatest changes at the training angle, but these effects remain controversial with limited rigorous evidence, and the possible underpinning physiological mechanism(s) remain opaque. This study investigated the extent of angle-specific changes in strength and neuromuscular activation after RT in comparison to a control group.

Methods

A RT group (n = 13) performed 14 isometric RT sessions at a knee-joint angle of 65° (0° is anatomical position) over a 4-week period, whilst a control group (CON, n = 9) maintained their habitual activity. Pre- and post-test sessions involved voluntary and evoked isometric knee extension contractions at five knee-joint angles (35°, 50°, 65°, 80° and 95°), while electromyography was recorded.

Results

RT group increased maximum voluntary torque (MVT) at the training angle (65°; + 12%) as well as 80° (+ 7%), 50° (+ 11%) and 35° (+ 5%). Joint-angle specificity was demonstrated within the RT group (MVT increased more at some angles vs. others), and also by more rigorous between-group comparisons (i.e., larger improvements after RT vs. CON at some angles than others). For the RT group, normalized EMG increased at three of the same joint angles as strength, but not for CON. Importantly, however, neither within- or between-group analyses provided evidence of joint angle-specific changes in activation.

Conclusion

In conclusion, this study provides robust evidence for joint angle-specific strength gains after isometric RT, with weaker evidence that changes in neuromuscular activation may contribute to these adaptations.

Keywords

Neuromuscular activation Muscle contractile properties Torque production Angle specificity 

Abbreviations

CON

Control group

CVW

Within-participant coefficient of variation

ECT

Explosive contraction training

EMG

Electromyography

EVC

Explosive voluntary contraction

MMAX

Supramaximal muscle compound action potential

MMAX P–P

MMAX peak-to-peak amplitude

MVC

Maximum voluntary contraction

MVT

Maximum voluntary torque

Octet PT

Octet peak torque

Octet T50

Octet torque measure at 50 ms after torque onset

QEMG0–50

Quadriceps femoris EMG epoch between 0 and 50 ms after EMG onset

QEMG0–100

Quadriceps femoris EMG epoch between 0 and 100 ms after EMG onset

QEMG0–150

Quadriceps femoris EMG epoch between 0 and 150 ms after EMG onset

QEMGMVT

Quadriceps femoris EMG at maximum voluntary torque

RF

Rectus femoris

RT

Resistance training

SCT

Sustained contraction training

T50

Explosive torque at 50 ms after torque onset

T100

Explosive torque at 100 ms after torque onset

T150

Explosive torque at 150 ms after torque onset

Twitch PT

Twitch peak torque

Twitch T50

Twitch torque measure at 50 ms after torque onset

VL

Vastus lateralis

VM

Vastus medialis

Notes

Author contributions

MBL, TGB, and JPF contributed to the design and implementation of the research to the analysis of the results and to the writing of the manuscript. All authors read and approved the manuscript.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflicts of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Sport, Exercise, and Health SciencesLoughborough UniversityLeicestershireUK
  2. 2.CAPES Foundation, Ministry of Education of BrazilBrasiliaBrazil

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