Examining Changes in Muscle Size and Body Composition Between Two Hypertrophy Resistance Training Programs in Males

NCT ID: NCT05667233

Last Updated: 2023-08-15

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 13 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-02-06
• Study Completion Date: 2023-04-03

Brief Summary

This study aims to investigate if a less physically and psychologically taxing approach to resistance training can generate equal or greater outcomes when compared to a more physically and psychologically taxing approach.

Detailed Description

Resistance training is commonly used to improve body composition, gain strength, increase muscle size (i.e., hypertrophy) and prevent muscle atrophy (i.e., muscle wasting). The most optimal mode of building muscle remains unclear, however there are many mechanisms that can be tested to yield optimal results. One variable that can be manipulated when designing a hypertrophy-focused resistance training regimen is intensity (i.e., proximity-to-failure). Proximity-to-failure is defined as the number of repetitions remaining in a set of prescribed exercises prior to reaching momentary muscular failure (MMF). MMF is when an individual cannot complete the lowering or concentric phase of a given repetition with a full range-of-motion without deviation from the prescribed form of the exercise. For all lifters, particularly amongst older populations, it can be psychologically demanding to push to MMF, and may increase the risk of delayed onset muscle soreness (DOMS) and/or injury due to technical breakdown. In contrast, there is some evidence that suggests training to a slightly less intensity (i.e., within 1-4 repetitions in reserve [RIR]) may result in comparable hypertrophic results with less of a physical and psychological demand on participants.

For these reasons, this study looks to investigate if an easier (i.e., less intense) approach to training such as training with repetitions in reserve (RIR), warrants similar or better muscle hypertrophy adaptations to MMF.

Conditions

Hypertrophy; Body Weight Changes; Muscle Size

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: NONE

Study Groups

Train to failure

Training regime will be highly uncomfortable since it will be both physically and psychologically challenging to push to momentary muscular fatigue (MMF; i.e., failure).

Group Type: ACTIVE_COMPARATOR

Resistance Training Program

Intervention Type: OTHER

Participants will undergo a high exertion machine-based resistance training protocol.

Train to non-failure

Training regime will be moderately uncomfortable as participants will be training at a close proximity to failure (4-0 repetitions in reserve; i.e., non-failure).

Group Type: ACTIVE_COMPARATOR

Resistance Training Program

Intervention Type: OTHER

Participants will undergo a high exertion machine-based resistance training protocol.

Interventions

Resistance Training Program

Participants will undergo a high exertion machine-based resistance training protocol.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• biological male
• age 18 years or older
• enrolled at Dalhousie university
• minimum 3-months of consistent (at least 2x/week) resistance training experience

Exclusion Criteria

• body fat percentage 25% or greater (obese)
• use of performance enhancing drugs that aim to increase rate of muscle growth (i.e., androgenic steroids, anabolic steroids, selective androgen receptive modulators, growth hormone).

• Minimum Eligible Age: 18 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: Yes

Sponsors

Dalhousie University

OTHER

Sponsor Role: lead

Responsible Party

Jeffery Zahavich, PhD

Instructor, Kinesiology

Responsibility Role: PRINCIPAL_INVESTIGATOR

Locations

Dalplex Fitness Centre

Halifax, Nova Scotia, Canada

Countries

Canada

Other Identifiers

2022-6399

Identifier Type: -

Identifier Source: org_study_id