European Journal of Applied Physiology

, Volume 118, Issue 1, pp 93–99 | Cite as

Causal effect of intra-abdominal pressure on maximal voluntary isometric hip extension torque

  • Kota Tayashiki
  • Fumihiro Mizuno
  • Hiroaki Kanehisa
  • Naokazu MiyamotoEmail author
Original Article



Intra-abdominal pressure (IAP) has been recently shown to be associated specifically with maximal voluntary isometric contraction (MVC) torque of hip extension, although the causal relationship remains unclear. The present study aimed to elucidate whether IAP has a causal effect on hip extension MVC torque.


IAP during hip extension MVC was changed by controlling the lung volume (i.e., depth of inspiration). Twelve healthy males conducted MVCs of hip extension during breath-hold at full inspiration (inspiratory condition) or expiration (expiratory condition), or during normal breath-hold (normal condition). IAP during MVCs was measured a pressure transducer placed in the rectum.


The IAP during hip extension MVC was significantly higher in inspiratory condition (132.0 ± 46.1 mmHg) than in the other two conditions and also higher in normal condition (104.6 ± 35.9 mmHg) than in expiratory condition (77.0 ± 39.1 mmHg). The hip extension MVC torque was significantly higher in inspiratory condition (297.7 ± 82.7 N m) than in expiratory condition (266.4 ± 84.5 N m). In each condition, the hip extension MVC torque correlated with IAP during the MVC task.


The current results suggest that IAP has a positive causal effect on hip extension MVC torque and that a sufficient increase in IAP directly leads to an enhancement of hip extension MVC torque.


Lung volume Core stability Abdominal muscle Diaphragm Electromyogram 



Analysis of variance


Average amplitude of electromyogram


Biceps femoris


Coefficient of variation




Erector spinae


Gluteus maximus


Intra-abdominal pressure


Intra-class coefficient


Maximal voluntary isometric contraction


Oblique external


Oblique internal


Rectus abdominis



The authors do not have any financial and personal relationship with other people or organizations that could inappropriately bias this work. The authors would like to thank all the participants in this study.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.National Institute of Fitness and Sports in KanoyaKanoyaJapan

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