Individual Response to Different Volumes of Resistance Training

Sponsor

Inland Norway University of Applied Sciences (Other)

Overall Status

Completed

CT.gov ID

NCT02179307

Collaborator

Sykehuset Innlandet HF (Other), Revmatismesykehuset AS (Other)

Enrollment

Location

Arm

Duration (Months)

5.3

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

The literature is not clear as to which training volume to employ during initial phases of resistance training programs to ensure optimal muscular adaptations. The purpose of this study is therefore to compare effects of strength training with low versus moderate volume on muscular function and hypertrophy in previously untrained, healthy individuals. Furthermore, the investigators will relate individual variation in responses to proxy markers of individual training state, such as baseline muscular function and muscle fiber type.

The study will include 25 women and 25 men and will consist of a 12-week resistance training protocol. Each study participant will act as their own control, performing both the low- (1-set) and the moderate-volume (3-sets) protocol, allocated to either the dominant or non-dominant leg, in a stratified and randomized fashion.

Primary outcome measures are thigh muscle cross section area and unilateral knee extension strength. Additionally, muscle fiber type composition will be evaluated as well as additional parameters of muscular function.

The primary hypothesis is that low-volume protocols will be beneficial for individuals with glycolytic muscle phenotypes, whereas the opposite will be true for individuals with more aerobic phenotypes.

Condition or Disease	Intervention/Treatment	Phase
Healthy	Behavioral: 12-week progressive strength training protocol	N/A

Study Design

Study Type:

Interventional

Actual Enrollment :

42 participants

Allocation:

N/A

Intervention Model:

Single Group Assignment

Masking:

None (Open Label)

Primary Purpose:

Basic Science

Official Title:

Determinants of Intra-individual Variation in Adaptability to Resistance Training of Different Volumes

Study Start Date :

Aug 1, 2014

Actual Primary Completion Date :

Apr 1, 2015

Actual Study Completion Date :

Apr 1, 2015

Arms and Interventions

Arm	Intervention/Treatment
Experimental: Arm label 1-Set, 3-Set 12-week progressive strength training protocol of different volumes	Behavioral: 12-week progressive strength training protocol Every study participant will complete 12 weeks of progressive strength training with one leg performing 1-set per exercise per session and the contralateral leg performing 3-sets per exercise per session. Allocation of dominant/non-dominant leg to either 1- or 3-set protocol will be done in a stratified, randomized fashion (stratified with regard to sex and baseline strength).

Arm

Intervention/Treatment

Experimental: Arm label 1-Set, 3-Set

12-week progressive strength training protocol of different volumes

Behavioral: 12-week progressive strength training protocol

Every study participant will complete 12 weeks of progressive strength training with one leg performing 1-set per exercise per session and the contralateral leg performing 3-sets per exercise per session. Allocation of dominant/non-dominant leg to either 1- or 3-set protocol will be done in a stratified, randomized fashion (stratified with regard to sex and baseline strength).

Outcome Measures

Primary Outcome Measures

Thigh muscle cross-sectional area [Week 0 (baseline) and 12 (post training intervention)]
Changes in muscle cross sectional area of each thigh from baseline to post intervention, assessed by MRI.
Unilateral knee-extension isometric strength [Week 0 (baseline), 2, 5, 9 (during intervention) and 12 (after training intervention)]
Time course changes in maximum knee extensor, isometric strength evaluated at 120° knee angle (180° fully extended).

Secondary Outcome Measures

Muscle strength [Week 0 (baseline), 2, 5, 9 (during intervention) and 12 (after training intervention)]
Time course changes in maximum isoinertial strength defined by one-repetition maximum in leg press, knee extension, knee flexion, and bench press.
Knee extensors and flexors force-velocity relationship [Week 0 (baseline), 2, 5, 9 (during intervention) and 12 (after training intervention)]
Time course changes in torque measured during maximal voluntary isokinetic contraction at 60°, 120° and 240° ∙ sec-1.
Blood hormonal profiles [Week 0 (baseline), 2 and 12 (post training intervention)]
Resting (week 0, 2 and 12) and acutely exercise-induced (week 2) hormonal profiles (testosterone, insulin-like growth factor 1, growth hormone and cortisol) determined in serum from venous blood samples.
Muscle fiber cross-sectional area [Week 0 (baseline), 2 and 12 (post training intervention)]
Changes in muscle fiber cross-sectional area assessed by immunohistochemistry from muscle biopsy. Determined from muscle biopsy samples (Vastus lateralis).
Protein expression [Week 0 (baseline), 2 and 12 (post training intervention)]
Changes in relative abundance of contractile protein isoforms (myosin heavy chain). Modification of proteins related to muscle hypertrophy in relation to an acute exercise session (assessed during week 2 of the intervention). Determined from muscle biopsy samples (Vastus lateralis).
Gene expression [Week 0 (baseline), 2 and 12 (post training intervention)]
Changes in gene expression related to skeletal muscle hypertrophy and structural phenotype measured in steady state conditions (biopsy sampled in resting conditions, week 0, 2 and 12) and in relation to acute exercise (biopsy sampled 1-h after strength exercise, week 2). Determined from muscle biopsy samples (Vastus lateralis).

Other Outcome Measures

Body composition changes [Week 0 (baseline) and 12 (post training intervention)]
Changes in body compositions (lean mass and fat mass) from prior intervention to after intervention assessed by dual x-ray absorptiometry scan.
Habitual physical activity [Week 0]
Self-reported prior habitual physical activity assessed by questionnaire and interview before training intervention
Daily nutrient intake [Week 6]
Daily nutrient intake assessed by a 4-day food intake registration.

Eligibility Criteria

Criteria

Ages Eligible for Study:

18 Years to 40 Years

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Yes

Inclusion Criteria:

Healthy
Non-smoking
Able to tolerate resistance exercise training

Exclusion Criteria:

Presence or history of cardiovascular, metabolic, endocrine or neuromuscular disease
Diagnosed mental health disorder
Intolerance to local anesthetic
No experience with exercise training
Performing regular resistance training (more than 1 session per week during last 12 months)
Impaired strength/ neuromuscular function due to previous injury
Recurrent pain in lower back, knee or shoulders
Taking prescribed medication that may affect outcome of training intervention