Activity of deep and superficial back muscles during open kinetic chain exercises

The purpose of this research: To evaluate electric activity of deep and superficial back muscles during open kinetic chain exercises. Goals of this research: 1. To evaluate electric activity of deep and superficial back muscles during open kinetic chain exercises performed on stable support. 2. To evaluate electric activity of deep and superficial back muscles during open kinetic chain exercises performed on labile support. 3. To compare electric activity of deep and superficial back muscles during each exercise. 4. To compare electric activity of back muscles between the same exercise pairs performed on different support type. 5. To compare electric activity of back muscles during exercise performed with one lower limb with exercise performed with both lower limbs. During this research 20 men, who had no recent complaints about low back pain (>3 months), were tested. The testing consisted of two parts: 15 min. for warm up exercises (5 min. – cardio respiratory warm up and 10 min. – stretching exercises) and the main testing. The main testing consisted of 11 exercises and 2 exercise to determine maximum voluntary contraction. Conclusion: 1. Electric activity of multifidus muscle was statistically significant higher than electric activity of thoracic part of erector spinae muscle during 5 from 7 exercises performed on stable support (p<0,05). 2. Electric activity of multifidus muscle was statistically significant higher than electric activity of thoracic part of erector spinae muscle during 2 from 4 exercises performed on labile support (p<0,05). 3. Electric activity of deep back muscle was statistically significant higher than superficial back muscle (Thoracic part of erector spinae muscle) during 7 from 11 exercises and during quadruped exercise on stable support electric activity deep back muscle was statistically significant higher than electric activity of lumbar part of erector spinae muscle (p<0,05). 4. Only one pair („Trunk extension on a ball” vs. „Angled trunk extension“) of exercises had statistically significant higher electric activity between superficial back muscles (p<0,05). 5. Statistically significant higher superficial back muscle activity was observed during exercise with the object to lift both lower limbs (p