Four Weeks of Supplementation With Isolated Soy Protein Attenuates Exercise-Induced Muscle Damage and Enhances Muscle Recovery in Well Trained Athletes: A Randomized Trial

Shweta Shenoy, Mrinal Dhawan, Jaspal Singh Sandhu, Shweta Shenoy, Mrinal Dhawan, Jaspal Singh Sandhu

Abstract

Background: The effects of consumption of isolated soy protein (ISP) for a chronic period (4 weeks) on exercise induced muscle damage (EIMD) in athletic population have never been explored.

Objectives: To examine the effects of ISP on muscle damage indices elicited via a bout of damaging exercise.

Patients and methods: Forty males (20 boxers, 20 cyclists) aged 18 - 28 years were randomly assigned to two groups (ISP and Placebo) (n = 20). All participants who engaged themselves in specific, regular training of 30 hours a week during the competitive season were included in the study. Participants consumed the supplement and the placebo for 4 weeks. The damaging exercise consisted of 100 consecutive drop-jumps. Pre and post supplementation readings of the criterion variables, highly sensitive C reactive protein (hs-cRP), creatine Kinase (CK), myeloperoxidase (MPO), isometric muscle strength, maximum aerobic capacity (VO2 max), heart rate (HR) and muscle soreness were obtained at baseline (Day 1), at 24 hours (Day 2) and at 48 hours (Day 3) following EIMD.

Results: Differences were observed in pre and post supplementation values (P < 0.05) indicating the effectiveness of soy protein in attenuating muscle damage and enhancing muscle recovery.

Conclusions: Our findings suggest that soy protein; a vegetable based supplement is effective, in ameliorating the negative effects of EIMD in trained athletic population.

Keywords: Amino Acids; C-Reactive Protein; Creatine Kinase; Exercise; Soybean Proteins.

Conflict of interest statement

Conflict of Interest:None declared.

Figures

Figure 1.. Flow Diagram of Participant Recruitment…
Figure 1.. Flow Diagram of Participant Recruitment and Allocation Into Groups

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