The aim of the present study was to analyze the training and detraining effects of concurrent aerobic training and resistance training against three different external loads on strength and aerobic variables. Thirty-two men were randomly assigned to four groups: low-load (LLG, n=9), moderate-load (MLG, n=9), high-load (HLG, n=8), and control group (CG, n=6). Resistance training consisted of FS with a low-load (40-55% 1RM), a moderate-load (55-70% 1RM) or a high-load (70-85% 1RM) combined with jump and sprint exercises. Aerobic training was performed at 75% of the maximal aerobic speed for 15-20 min. The training period lasted for 8-weeks, followed by 4-weeks detraining. Pre, post-training and post-detraining evaluations included 20m running sprints (0-10m: T10; 0-20m: T20), shuttle run test, countermovement vertical jump test (CMJ), and loading test (1RM) in full-squat (FS). All the experimental groups showed improvements (p<0.05) in all the parameters assessed, except the LLG for T10 and the HLG for T20. The LLG, MLG and HLG showed great changes in 1RM and VO2max compared with the CG (p<0.05), whereas the HLG and MLG showed a greater percentage change than the CG in T10 (p<0.001) and CMJ (p<0.05). The 4-week detraining period resulted in detrimental effects in all variables analyzed for all three experimental groups. In conclusion, our results suggest that strength training programs with low, moderate, or high external loads combined with low-intensity aerobic training could be effective for producing significant gains in strength and aerobic capacities. Moreover, the higher loads used increased gains in explosive efforts.
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