Different Cooling Strategies Applied During Inter-Set Rest Intervals in High-Intensity Resistance Training.

The purpose of this study was to verify whether cooling between sets during high-intensity resistance exercise improves physical performance and to compare performance among different sites of cooling. It is important because delaying the muscular fatigue could improve total volume at a training session which could lead to greater hypertrophy. Nine healthy and recreational resistance training experienced men, performed six tests of a biceps curl exercise on different days. The first test was the one-repetition maximum test (1RM). Following, we applied five sessions, in crossover and randomized (counter-balanced) design. The subjects received different cooling strategies in each session for 1-min (inter-set rest interval): Control (C) (no Cooling); Palm Cooling (PC); Neck Cooling (NC); Local Cooling (LC) or Tunnel Temperature Cooling (TTC). We analyzed the maximum number of repetitions and the rating of perceived exertion (RPE). The Bayesian analysis showed that no cooling strategy was able to improve performance compared to control, and just NC, when compared to control, showed a 71% probability of increasing the total volume of repetitions. Also, RPE was not modulated by any cooling strategy compared to control, but NC has a chance to reduce individuals' RPE by 52%. In conclusion, no cooling strategy was efficient to improve physical performance during a high-intensity resistance exercise.

Airflow-Restricting Mask Reduces Acute Performance in Resistance Exercise.

BACKGROUND: The aim of this study was to compare the number of repetitions to volitional failure, the blood lactate concentration, and the perceived exertion to resistance training with and without an airflow-restricting mask. METHODS: Eight participants participated in a randomized, counterbalanced, crossover study. Participants were assigned to an airflow-restricting mask group (MASK) or a control group (CONT) and completed five sets of chest presses and parallel squats until failure at 75% one-repetition-maximum test (1RM) with 60 s of rest between sets. Ratings of perceived exertion (RPEs), blood lactate concentrations (Lac-), and total repetitions were taken after the training session. RESULTS: MASK total repetitions were lower than those of the CONT, and (Lac-) and MASK RPEs were higher than those of the CONT in both exercises. CONCLUSIONS: We conclude that an airflow-restricting mask in combination with resistance training increase perceptions of exertion and decrease muscular performance and lactate concentrations when compared to resistance training without this accessory. This evidence shows that the airflow-restricting mask may change the central nervous system and stop the exercise beforehand to prevent some biological damage.