Energy Resource Of Four Styles Of 30s All-out Rope Skipping

Abstract

Rope jumping has been popular and a major tool for training and entertainment. When skipping rate per jump increments from single under to quad under, flight time prolonged and increased swinging frequency, the proportion of aerobic and anaerobic energy supply may be different. PURPOSE: To compare 30-s all-out rope skipping energy resource between four styles. METHOD: 10 elite rope-skipper from Shanghai University of Sport(height=169.3±4.7cm;body mass=65.5±9.2kg; age=23.2±2.1yrs, years of training=3.8±1.3yrs)volunteered for this study. Participants conducted 30-second rope skipping test at 1 skip per jump (single under, SU), 2 skip per jump (double under, DU), 3 skip per jump (triple under, TU) and 4 skip per jump (quad under, QU), and completed as many repetitions as possible with 24 hours between trials. VO2 were monitored at rest, during test and up to 1 hour after test. Blood lactate was measured immediately, minute by minute after test. Lactic (WBla) and alactic anaerobic (WPCr) energy outputs were calculated from net lactate production and the fast component of EPOC. Aerobic metabolism (Waer) was determined from VO2 during exercise. Net energy expenditure (Wtot) was calculated as summary of WPCr,WBla and Waer. RESULT: SU exhibited significantly lower Wtot value (49.9±12.70 kJ) than in DU (69.2±11.05), TU (72.0±13.59) and QU (81.0±16.25) (p<0.01). WPCr (kJ) was significantly different between SU (23.4±6.9), TU (33.7±12.8) and QU (40.0±10.5) (p<0.05), and DU (29.1±8.0) and QU (p<0.05). Wbla (kJ) in SU and QU were significantly different (16.5±6.8 v.s 27.2±12.4, p<0.05). SU (10.0±2.2) had significantly lower Waer (kJ) value than the other styles (DU 12.3±3.1, TU 14.8±2.4, QU 13.7±3.7, p<0.05). WPCr and Wbla accounted for 45.6%~50.2% and 32.2%~35.3% of total energy in four styles with no difference between styles (p>0.05). Aerobic provided 16.8~22.1% of total energy in all styles, with significant difference between SU and QU (20.6±4.8% v.s 16.8 ±2.5%, p<0.05), TU (22.1±8.6%) and QU (p<0.05). CONCLUSION: Four styles of 30s all-out rope skipping are all anaerobic-dominated with similar fractions, PCr and anaerobic lactic account for 45.6%~50.2% and 32.2%~35.3% of total energy. Keywords: rope skipping, metabolism, energy resource