Beach and indoor volleyball athletes present similar muscular activation of lower limbs during the countermovement jump

The purpose of this study was to compare and correlate the power, height, eccentric and concentric force development rate of three sequential attempts of countermovement jump (CMJ) and their respective muscle response in beach and indoor volleyball athletes. The sample was composed by High-Level Hard Court Indoor Volleyball (HCIV, n=7) and High Level Sand Court Beach Volleyball athletes (SCBV, n=6). The subjects performed 3 CMJ jumps (1stCMJ vs. 2ndCMJ vs. 3rd CMJ) to determine the height, eccentric force development rate (EFDR), concentric force development rate (CFDR), power and lower limbs muscle electrical activity, p≤.05. Results demonstrated difference between HCIV vs. SCBV in EFDR of the 3 rd CMJ (-270.2±31.6N/s vs. -214.3±38.7 N/s). In HCIV, the 1stCMJ was different from 2 ndCMJ and 3rd CMJ in EFDR (-239.0±27.3 N/s vs. - 285.6±40.2 N/s and -270.2±31.6 N/s), CFDR (87.8±24.4 N/s vs. 89.6±25.7 N/s and 75.0±23.6 N/s) and power (2341.8±342.3W vs. 2433.9±327.2W and 2411.0±358.5W) and in SCBV, the 2ndCMJ was different from the 3 rd CMJ in EFDR (-267.1±45.2 N/s vs. -214.3±38.7 N/s). In the 2 nd CMJ, the left gluteus presented lower electrical activity than the left medial gastrocnemius and HCIV presented a difference between the response of the right and left gluteus in the 3 rd CMJ. Our analysis demonstrated ~70% of good or excellent intraclass correlation by the beach and indoor groups