Internal and external oblique muscles are similar in their phasic activity during walking and running

Stephanie Valentin, Manuela Treppler, Theresia Licka

Research output: Contribution to conferencePosterpeer-review


Human gait has been extensively investigated, although
less is reported about trunk muscle activation during gait.
The study aim was to determine internal oblique (IO) and
external oblique (EO) muscle activity during walking and
running, using a quartile method of analysis. Kinematic
data were collected using 10 high speed cameras to
identify reflective markers positioned over the left and
right lateral malleoli in 12 healthy participants. Surface
electromyography (EMG) electrodes were attached to EO
and IO (left and right sides). EMG signals were transmitted via telemetry and synchronised with the kinematic data collected during treadmill walk and run (three trials each). Surface EMG data were full-wave rectified and re-sampled to match kinematic data. Data were cut into motion cycles based on the right malleolus. From each motion cycle, the stride parameters of height and length based on the left and right malleoli were calculated. EMG data were expressed as a percentage of the Maximal Observed EMG (%MOE) and the first (Q1), second (Q2), third (Q3) and interquartile range (IQR) were calculated. For Q2 during walk, OI left was significantly greater than OE left (p=0.038), but no statistical significance between any muscles for Q2 was found during running. There were no statistically significant IQR differences found between any of the muscles during
walking or running. In conclusion, OI and OE are similar
in their phasic activity during walking and running.
Original languageEnglish
Number of pages2
Publication statusPublished - 9 Aug 2013
Externally publishedYes
EventXXIV Congress of the International Society of Biomechanics: XV Brazilian Congress of Biomechanics - Natal, Brazil
Duration: 4 Aug 20139 Aug 2013 (Conference details)


ConferenceXXIV Congress of the International Society of Biomechanics
Abbreviated titleISB 2013 Brazil
Internet address


Dive into the research topics of 'Internal and external oblique muscles are similar in their phasic activity during walking and running'. Together they form a unique fingerprint.

Cite this