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Indexed/Abstracted in: BIOSIS Previews, EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1812
José VILAÇA-ALVES 1, 2, Flávia GUIMARÃES 1, Claudio ROSA 1, Eduardo B. NEVES 1, 3, 4, Francisco SAAVEDRA 1, 2, André O. FERNANDES 5, Victor M. REIS 1, 2
1 Department of Sports Science, University of Trás os Montes and Alto Douro, Vila Real, Portugal; 2 Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal; 3 Brazilian Army, Brasília, Brazil; 4 Federal Technological University of Paraná, Paraná, Brazil; 5 Estacio de Sá University, Petropolis, Brazil
BACKGROUND: This study observed the influence of the surface (stable and unstable) on the electrical activity of the muscles rectus abdominal (RA), extern abdominal oblique (EAO), and rectus femoral (RF), in the abdominal crunch exercise (AC).
METHODS: Twenty individuals, apparently healthy, Caucasians and physically actives (22.40±2.46 years old, 71.38±9.71 Kg body mass, 176.55±6.29 cm height and 5.47±2.64% estimated body fat), were performed 1 set, of 10 repetitions, of the abdominal crunch exercise on the floor (ACF) and on the Swiss Ball (ACSB), in random way, with a 10 minutes interval between the two conditions. It was collected the electrical signal of the RA, EAO and RF by surface electromyography and were analysed the peak signal.
RESULTS: It was observed a significant, (F(2, 52)=11.213 p=0.002, ηp2=0.228), differences on the peak signal, in the RF muscle, between the executions of the AC in the two surfaces. In the ACSB the peak signal of the RF was significantly higher than in the ACF (26.56 ±12.47 Hz x 44.15±19.91 Hz), respectively). In the AC execution, in both surfaces, the peak signal of the RA and EAO were significantly, (p<0.0001), higher than the RF muscle.
CONCLUSIONS: In conclusion, the abdominal crunch on the floor and on the Swiss ball promote a higher activation of the rectus abdominis and extern abdominal oblique muscles than the rectus femoral muscle. Subjects with low back injuries can performing the abdominal crunch on the floor, in detriment of the same exercise performed in the Swiss Ball.