Author(s): BARBIERI, R.A., LUCHES-PEREIRA, G., CARVALHO, C.D., SERRANO, V., Institution: UNIVERSITY OF BOLOGNA, Country: ITALY, Abstract-ID: 843

INTRODUCTION:
The relationship between volume, intensity, and periodicity is crucial for resistance training and the manipulation of these variables creates different stimuli, which can promote different magnitudes of decrease in performance. However, it isnt clear how the recovery is affected by the combination of these variables when repetitive stimuli are performed until concentric muscle failure. This study aimed to verify the effect of two different combinations of volume and intensity of the resistance training sessions on fatigue and the time course of recovery.
METHODS:
Twelve males participated in the study (23.3±2.6yrs, 179.3±5.2cm, and 87.3±13.4kg). Firstly, a period of 5 weeks of resistance training adaptation was performed. Then, it was done two experimental acute sessions (training model A -TMA- and B - TMB) with an interval of at least 72h. TMA had high volume and less intensity (4 sets of 16 to 18 maximum repetitions - 50 to 60% of one repetition maximum; 60sec of the interval; free cadence). TMB had less volume and high intensity (4 sets of 8 to 10 maximum repetitions - 80 to 90% of one repetition maximum; 180sec of the interval; the cadence of 4sec/repetition). All resistance exercise sessions were performed for the lower limbs following the same exercise sequence (free squat, 45º leg press, leg curl machine, leg extension, adductor, and abductor machine). The internal training load was calculated through the Rate of Perceived Exertion (RPE). The Twitch Interpolation technic, heart rate variability (HRV), countermovement jump (CMJ) and squat jump (SJ) were applied in five moments: pre and post training sessions, and 6 hours, 24 hours, and 48 hours after the training sessions.
RESULTS:
RPE was similar for TMA and TMB (9,0±0,5 and 8,7±0,71a.u.), however, the internal load of TMA was significantly higher in comparison to TMB (p <0.05). Reduction in peak force (PF) after the experimental sessions was significant only to the MTA (TMA: -20.1±11.3%; TMB: -7.7±10.9%), and the PF keep reduce until 6hrs after the session to TMA (11.1±8.6%; p<0.01). TS and Voluntary activation did not show any significant difference (p <0.05) in the moments analyzed for both TMA and TMB, however, twitch control showed a significant reduction (p <0.05) in the post TMA session indicating peripheral fatigue. The SJ and CMJ presented a significant reduction (p <0.05) after the training sessions for both TMA and TMB with a complete recovery after 6 hours for MTA and 24 hours for MTB. HRV presented a significant reduction post training (SDNN, RMSSD, HF), with a recovery after 6 hours only for MTA.
CONCLUSION:
The complete session with higher volume and lower intensity, with repetition stimuli performed until concentric muscle failure can generate peripheral fatigue, reduce jump performance increase the sympathetic activity after the training session, and demand longer neuromuscular recovery time (more than 6 hours) compared to a higher intensity and lower volume training session.