Resistance Training in the Fasted State

Summary

It is well evidenced in the literature that fasting aerobic exercise generates a series of metabolic differences when compared to exercise performed in the fed state, including the use of fats predominantly as an energy source. Consequently, increases in adaptations to aerobic training, related to health and physical performance, are observed when sessions are performed in the fasted state. In relation to resistance training, the evidence is limited. There is a lack of data in the literature regarding the effects of fasting on resistance exercises and whether this practice may reflect in losses or improvements in morphological and neuromuscular adaptations related to resistance training. Thus, the aim of the present project is to compare the effects of resistance training performed in the fasted state compared to the fed state during 12 weeks on body composition and physical performance in young adults. Thirty-four eutrophic or overweight individuals, not engaged in regular resistance exercises, aged between 20 and 40 years, will be recruited. They will be put on a standard customized diet and will perform 2 weekly sessions of resistance exercise after overnight fasting (10 to 12 hours) or in the fed state, for 12 weeks. Before, in the middle and after this period, evaluations of body composition, muscle thickness and quality, maximum dynamic strength and maximum power will be analyzed. Comparisons will be performed using Generalized Estimating Equations (GEE), adopting the factors group (2 stratifications) and time (3 stratifications). All results will be expressed as mean and standard deviation and the accepted significance level will be 5%.

Conditions

• Fasting
• Exercise
• Resistance Training

Interventions

OTHER

Resistance training in the fasted state

On the first day of evaluations, the subjects will perform the basal metabolic rate (BMR) analysis, as well as familiarization with the neuromuscular tests. After the preliminary tests, the volunteers will perform the pre-intervention procedures. Assessments of body composition, muscle thickness and quality, maximum dynamic strength and maximum power will be performed. In addition, instruments related to dietary control and physical activity level will be applied. Subsequently, in a randomized manner, participants will be allocated to one of two different interventions. During the intervention (8 weeks), the adherence to the standard diet will be verified, as well as body composition, muscle thickness and quality, maximum dynamic strength and maximum power will be reassessed. After the 12 weeks of intervention, the volunteers will perform the evaluations referring to the post-intervention moment, following the same steps of the pre-intervention collections.

OTHER

Resistance training in the fed state

On the first day of evaluations, the subjects will perform the basal metabolic rate (BMR) analysis, as well as familiarization with the neuromuscular tests. After the preliminary tests, the volunteers will perform the pre-intervention procedures. Assessments of body composition, muscle thickness and quality, maximum dynamic strength and maximum power will be performed. In addition, instruments related to dietary control and physical activity level will be applied. Subsequently, in a randomized manner, participants will be allocated to one of two different interventions. During the intervention (8 weeks), the adherence to the standard diet will be verified, as well as body composition, muscle thickness and quality, maximum dynamic strength and maximum power will be reassessed. After the 12 weeks of intervention, the volunteers will perform the evaluations referring to the post-intervention moment, following the same steps of the pre-intervention collections.

Sponsors & Collaborators

• Federal University of Rio Grande do Sul

  lead OTHER

Study Design

Allocation

RANDOMIZED

Purpose

OTHER

Masking

TRIPLE

Model

PARALLEL

Eligibility

Min Age

19 Years

Max Age

40 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2022-05-23

Primary Completion

2022-12-23

Completion

2022-12-23

Countries

• Brazil

Study Locations