Association of Training in Basic Life Support with the Evolution of Cardiopulmonary Resuscitation Performed by Firefighters.

Introduction: This study aimed to compare the results of professional technical and anthropometric anamnesis data with the transmission of external chest compressions performed by military firefighters at different execution times.

Objective: The objective was to evaluate the performance and perceived effort of the sequence of external chest compressions performed in two minutes, as well as the evolution of the technique over time.

Materials And Methods: This was a descriptive, correlational study involving adult firefighters who were members of a specific firefighter group, comprising a population of 105 individuals with a voluntary sample of 44 participants.

Three Simulated Goalball Games in the Same Day Cause Central Fatigue and Can Impair Game Technical Performance.

The purpose of this study was to investigate the effects of three simulated goalball games on neuromuscular, physiological, perceptual, and technical parameters. Ten male players underwent assessments before and immediately after each game. Heart rate was recorded at rest and during all games that were entirely filmed for further technical performance analysis.

Metformin anticipates peak of lactate during high-intensity interval training but no changes performance or neuromuscular response in amateur swimmers.

Background & Aims: Metformin demonstrated potential to improve metabolic efficiency in short-intense and prolonged-continuous efforts. The present study investigates the acute effects of metformin intake on performance, rating of perceived exertion (RPE), blood lactate, blood glucose and neuromuscular parameters related to swimming high-intensity interval series.

Methods: A double-blind, crossover, randomized and placebo-controlled study was carried out.

Corrigendum: Proposal of a Conditioning Activity Model on Sprint Swimming Performance.

[This corrects the article DOI: 10.3389/fphys.2020.

Effect of COVID-19 Quarantine on Voice Handicap Index in Female Classical Singers.

Objective: This study aimed to verify the impact of vocal deviation in the quality of life of classical female singers over the quarantine imposed by the COVID-19 pandemic through self-assessments.

Methods: Fifty five professional classical female singers filled out an online questionnaire including general questions such as identification, age, professional experience time, vocal classification, time of singing, and rehearsal studies. They all answered the protocol Classical Singing Handicap Index, adapted for this research, which analyses three subscales: Disability, Handicap, and Impairment.

Proposal of a Conditioning Activity Model on Sprint Swimming Performance.

This study aimed to propose a conditioning activity (CA) model to stimulate improvement on neuromuscular responses, mechanical parameters and for the 50-m freestyle swimming. Thirteen male swimmers (19 ± 3 years and performances of 77% in relation to World Championship records) performed four CA protocols followed by a maximum performance in the 50-m freestyle. In the first protocol (P1) swimmers performed a standard warm-up (∼15 min); in the second protocol (P2) lunges (3 × 85% of the one-repetition maximum); in the third (P3) pull-ups (3 maximum repetitions) and box jumps 40 cm high and 60 cm deep (1 × 5 with 10% of the corporal weight); and in the fourth protocol (P4) a combination of exercises from the second and third protocols.