Strongman- and hypertrophy-based resistance training evoke a high, but similar energy expenditure per minute of exercise and level of stress on the autonomic nervous system in young, resistance-trained men. The purpose of the study was to compare heart rate (HR), heart rate variability (HRV) and energy expenditure (EE) across three resistance training (RT) protocols - strongman training (ST), traditional hypertrophy training (HT), and a mixed strongman and hypertrophy training (MST), in trained young men. Seven resistance trained men (24.9 ± 3.6 y; 87.1 ± 10.5 kg; 175.7 ± 3.9 cm) volunteered to participate in a ST, HT, and MST RT session. For each training session, participants completed three sets of 4-5 specific exercises to muscle failure. Exercise HR, HRV indices and EE (total, EET; per minute of exercise EEmin) were measured using a Polar heart rate monitor (Polar Electro Inc., Lake Success, NY) during each RT session. HRV indices included R-R Interval (RRI), RRI standard deviation (RRI SD), low frequency (LF), high frequency (HF), LF to HF ratio, and root-mean RMSSD. The HT session generated significantly lower EET than both ST and MST (p = 0.04), but there was no significant difference in EEmin, HR or HRV indices between training sessions. The acute RT sessions performed in the current study evoked a high level of autonomic stress and EE. The lack of significant difference between each acute training session suggests no significant difference in physiological stress (as measured by HR and HRV indices) between HT or ST training protocols in resistance-trained young men. This study also highlights the high-level of autonomic nervous system stress experienced during high intensity RT, suggesting sufficient rest and recovery is necessary following acute RT sessions similar to those in this study prior to the next training session.
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