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Herbert, P., Hayes, L. D., Sculthorpe, N., & Grace, F. M. (n.d.). high-intensity interval training (HIIT) increases insulin-like growth factor-I (IGF-I) in sedentary aging men but not masters' athletes: an observational study. Aging male, 20, 54–59. http://access.bl.uk/ark:/81055/vdc_100045335294.0x00004f