Muscle Growth Following a Resistance Training Program in Men and Women Consuming Protein Supplements

Study Results

Results available

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

61 participants

Study Classification

INTERVENTIONAL

Study Start Date

2016-08-15

Study Completion Date

2017-04-30

Brief Summary

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Soy and whey protein have different concentrations of leucine, an amino acid known to be a particularly potent simulator of muscle protein synthesis. The purpose of this study is to determine whether matching soy and whey protein supplements for leucine content instead of by total protein content would contribute to differences in strength increases and muscle growth in response to 12 wk of resistance training.

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Detailed Description

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Conditions

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Skeletal Muscle Growth

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

OTHER

Blinding Strategy

DOUBLE

Participants Investigators

Study Groups

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Soy protein group

Group Type ACTIVE_COMPARATOR

Soy protein supplement

Intervention Type DIETARY_SUPPLEMENT

26 g soy protein isolate (contains 2 g leucine) was consumed daily by the other intervention group.

Whey protein group

Group Type ACTIVE_COMPARATOR

Whey protein supplement

Intervention Type DIETARY_SUPPLEMENT

19 g whey protein isolate (contains 2 g leucine) was consumed daily by one intervention group.

Interventions

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Whey protein supplement

19 g whey protein isolate (contains 2 g leucine) was consumed daily by one intervention group.

Intervention Type DIETARY_SUPPLEMENT

Soy protein supplement

26 g soy protein isolate (contains 2 g leucine) was consumed daily by the other intervention group.

Intervention Type DIETARY_SUPPLEMENT

Eligibility Criteria

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Inclusion Criteria

* non-smoking
* body mass index (BMI) 18.5-24.9
* recreationally active

Exclusion Criteria

* participated in structured weight training during the previous 12 month
* vegetarian or vegan
* presence of chronic disease
* pregnant, postpartum up to six months, lactating, or intention to become pregnant
* allergy to whey or soy
* changes in body weight more than 10 pounds in the past three months

Minimum Eligible Age

18 Years

Maximum Eligible Age

35 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes