Paper Information

Journal:   OLYMPIC   SPRING 2008 , Volume 16 , Number 1 (SERIAL 41); Page(s) 27 To 36.
 
Paper: 

COMPARISON BETWEEN ABDOMINAL AND HIP FLEXOR MUSCLES ACTIVATION DURING DIFFERENT POSITION OF SITUP AND CRUNCH EXERCISES

 
Author(s):  MOHEBI HAMID*, HOSSEINI SEYED ALI, AFSHARNEZHAD T., SHAD MEHRI S., AGHAEI N.
 
* GUILAN UNIVERSITY
 
Abstract: 

The purpose of the present study was to investigate the abdominal and hip flexor muscles activation during different position of sit-up and crunch exercises. Fifteen voluntary healthy males (age: 21.52±1.4 years, height: 175.3±5.86 cm, weight: 73.4±6.2 kg and body fat percent: 12.4±2.1 percent) without history of neural diseases, back pain, trunk and hip muscles and joints injuries participated in this study as subjects. Surface electromyography (Average EMG) from abdominal (Rectus Abdominous and Obliqus Externus) and hip flexor muscles (Rectus Femoris and Sartorius) which in each of sit-up and crunch exercise with various combination of knee flexion and extension and leg support or unsupported were measured. Time normalization of muscle AEMG measurement was done with metronome in five repetitions for each exercise. The result indicated that the hip flexors were highly activated in sit-up exercise (5417.8±468.13 mV) whereas in crunch relatively was lower (1659.7±310.53 mV). In contrast the abdominal muscle showed marked activation during both exercise (sit-up:8106.3±548.09 mV crunch: 39878±1303.4 mV). Also in sit-up exercise along with flexed and supported legs hip flexor activation increased (from 2226.5±335 mV to 2641±404.8 mV) whereas such modification did not generally alter the activation level of the abdominal muscles. It can be concluded that there is task specificity in the activation levels of trunk and hip flexor muscles in various forms of common training exercises used in sports. Certain modifications led to specific activation of hip and trunk flexor synergies as well as of individual muscles.

 
Keyword(s): ABDOMINAL MUSCLES, CRUNCH, ELECTROMYOGRAPHY, HIP FLEXOR MUSCLES, SIT-UP
 
References: 
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