In the last years, mainly 2 high-intensity-training (HIT) protocols became common: first, a Wingate-based "all-out" protocol and second, a 4×4 min protocol. However, no direct comparison between these protocols exists, and also a comparison with high-volume-training (HVT) is missing. Therefore, the aim of the present study was to compare these 3 endurance training protocols on metabolic, hormonal, and psychological responses. Twelve subjects performed: 1) HVT [130 min at 55% peak power output (PPO)]; 2) 4×4 min at 95% PPO; 3) 4×30 s all-out. Human growth hormone (hGH), testosterone, and cortisol were determined before (pre) and 0', 30', 60', 180' after each intervention. Metabolic stimuli and perturbations were characterized by lactate, blood gas (pH, BE, HCO₃⁻, pO₂, PCO₂), and spirometric analysis. Furthermore, changes of the person's perceived physical state were determined. The 4×30 s training caused the highest increases in cortisol and hGH, followed by 4 × 4 min and HVT. Testosterone levels were significantly increased by all 3 exercise protocols. Metabolic stress was highest during and after 4×30 s, followed by 4×4 min and HVT. The 4×30 s training was also the most demanding intervention from an athlete's point of view. In conclusion, the results suggest that 4×30 s and 4×4 min promote anabolic processes more than HVT, due to higher increases of hGH, testosterone, and the T/C ratio. It can be speculated that the acute hormonal increase and the metabolic perturbations might play a positive role in optimizing training adaptation and in eliciting health benefits as it has been shown by previous long term training studies using similar exercise protocols.
I totally understand what kind of job you had. I work at a Wally World distribution center. Started in shipping, loading about 3 to 4 full semi’s a day. Didn’t know how much weight I loaded. Then switched to non conveyable. When in dog food, I’d stack about 60k/lbs in 12 hours. That was MUCH easier than shipping. My first year, I struggled. Then I talked to my bro-in-law, who is a personal trainer, found and I started to do good. I was taking creatine and C4 prior to work, and took an Animal Pak with UniLiver every break, while eating protien every 3-4 hours. This brought me to Muscle for Life and The Books. I’m in maintenance department now, and are about to join a gym. I’ve been wanting to get the Legion multi’s and switch to Legion supplements. I’m about done reading BLS, and are gonna start the year one challenge. I’ve aready bought BBLS and Shredded Chef. I get excited every time I think about my goals.