Effect of Protein Source and Resistance Training on Body Composition and Sex Hormones

Overview

Journal J Int Soc Sports Nutr

Date 2007 Oct 3

PMID 17908338

Citations 12

Authors

Douglas Kalman

Samantha Feldman

Michele Martinez

Diane R Krieger

Mark J Tallon

Affiliations

Soon will be listed here.

Abstract

Background: Evidence suggests an inverse relationship between soy protein intake and serum concentrations of male sex hormones. Anecdotal evidence indicates that these alterations in serum sex hormones may attenuate changes in lean body mass following resistance training. However, little empirical data exists regarding the effects of soy and milk-based proteins on circulating androgens and exercise induced body composition changes.

Methods: For 12 weeks 20 subjects were supplemented with 50 g per day of one of four different protein sources (Soy concentrate; Soy isolate; Soy isolate and whey blend, and Whey blend only) in combination with a resistance-training program. Body composition, testosterone, estradiol and sex hormone binding globulin (SHBG) were measured at baseline and week 12.

Results: Protein supplementation resulted in a significant increase in lean body mass independent of protein source (0.5 +/- 1.1 and 0.9 +/- 1.4 kg, p = 0.006, p = 0.007). No significant differences were observed between groups for total and free testosterone, SHBG, percentage body fat, BMI or body weight. The Testosterone/Estradiol ratio increased across all groups (+13.4, p = 0.005) and estradiol decreased (p = 0.002). Within group analysis showed significant increases in the Testosterone/Estradiol ratio in soy isolate + whey blend group (+16.3, p = 0.030). Estradiol was significantly lower in the whey blend group (-9.1 +/- 8.7 pg/ml, p = 0.033).

Conclusion: This investigation shows that 12 week supplementation with soy protein does not decrease serum testosterone or inhibit lean body mass changes in subjects engaged in a resistance exercise program.

Citing Articles

Effect of Soy Protein Supplementation on Muscle Adaptations, Metabolic and Antioxidant Status, Hormonal Response, and Exercise Performance of Active Individuals and Athletes: A Systematic Review of Randomised Controlled Trials.

Zare R, Devrim-Lanpir A, Guazzotti S, Ali Redha A, Prokopidis K, Spadaccini D Sports Med. 2023; 53(12):2417-2446.

PMID: 37603200 PMC: 10687132. DOI: 10.1007/s40279-023-01899-w.

Manipulation of Dietary Intake on Changes in Circulating Testosterone Concentrations.

Zamir A, Ben-Zeev T, Hoffman J Nutrients. 2021; 13(10).

PMID: 34684376 PMC: 8538516. DOI: 10.3390/nu13103375.

No Significant Differences in Muscle Growth and Strength Development When Consuming Soy and Whey Protein Supplements Matched for Leucine Following a 12 Week Resistance Training Program in Men and Women: A Randomized Trial.

Lynch H, Buman M, Dickinson J, Ransdell L, Johnston C, Wharton C Int J Environ Res Public Health. 2020; 17(11).

PMID: 32486007 PMC: 7312446. DOI: 10.3390/ijerph17113871.

Environment-wide association study to comprehensively test and validate associations between nutrition and lifestyle factors and testosterone deficiency: NHANES 1988-1994 and 1999-2004.

Lopez D, Wulaningsih W, Tsilidis K, Baillargeon J, Williams S, Urban R Hormones (Athens). 2020; 19(2):205-214.

PMID: 32077039 PMC: 7323003. DOI: 10.1007/s42000-020-00179-w.

Protein supplementation intake for bodybuilding and resistance training may impact sperm quality of subfertile men undergoing fertility treatment: a pilot study.

Ketheeswaran S, Haahr T, Povlsen B, Laursen R, Alsbjerg B, Elbaek H Asian J Androl. 2018; 21(2):208-211.

PMID: 30226218 PMC: 6413551. DOI: 10.4103/aja.aja_49_18.

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