- Title
- No effect of a whey growth factor extract during resistance training on strength, body composition, or hypertrophic gene expression in resistance-trained young men
- Creator
- Dale, Michael J.; Coates, Alison M.; Howe, Peter R. C.; Tomkinson, Grant R.; Haren, Matthew T.; Brown, Andrew; Caldow, Marissa; Cameron-Smith, David; Buckley, Jonathan D.
- Relation
- Funding BodyNHMRCGrant Number511345 http://purl.org/au-research/grants/nhmrc/511345
- Relation
- Journal of Sports Science and Medicine Vol. 16, Issue 2, p. 230-238
- Relation
- https://www.jssm.org/hf.php?id=jssm-16-230.xml
- Publisher
- Journal of Sports Science and Medicine
- Resource Type
- journal article
- Date
- 2017
- Description
- Growth factors can be isolated from bovine milk to form a whey growth factor extract (WGFE). This study examined whether WGFE promoted activation of the AKT/mTOR pathway enabling increased lean tissue mass and strength in resistance trained men. Forty six men with >6 months of resistance training (RT) experience performed 12 weeks of RT. Participants consumed 20 g/day of whey protein and were randomised to receive either 1.6 g WGFE/day (WGFE; n = 22) or 1.6 g cellulose/day (control, CONT; n = 24). The primary outcome was leg press one-repetition maximum (LP1-RM) which was assessed at baseline, 6 and 12 weeks. At baseline and 12 weeks body composition was assessed by dual energy x-ray absorptiometry, and muscle protein synthesis and gene expression were assessed (vastus lateralis biopsy) in a sub-sample (WGFE n = 10, CONT n = 10) pre- and 3 hr post-training. RT increased LP1-RM (+34.9%) and lean tissue mass (+2.3%; p < 0.05) with no difference between treatments (p > 0.48, treatment x time). Post-exercise P70s6k phosphorylation increased acutely, FOXO3a phosphorylation was unaltered. There were no differences in kinase signalling or gene expression between treatments. Compared with CONT, WGFE did not result in greater increases in lean tissue mass or strength in experienced resistance trained men.
- Subject
- nutritional supplement; lean tissue mass; gene expression; P70s6k; FOXO3a
- Identifier
- http://hdl.handle.net/1959.13/1397372
- Identifier
- uon:34251
- Identifier
- ISSN:1303-2968
- Rights
- This work is licensed under a Creative Commons License Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
- Language
- eng
- Full Text
- Reviewed
- Hits: 9962
- Visitors: 10233
- Downloads: 388
| Thumbnail | File | Description | Size | Format | |||
|---|---|---|---|---|---|---|---|
| View Details Download | ATTACHMENT02 | Publisher version (open access) | 421 KB | Adobe Acrobat PDF | View Details Download |