The effects of resistance training with or without peanut protein supplementation on skeletal muscle and strength adaptations in older individuals
Donald A. Lamb, Johnathon H. Moore, Morgan A. Smith, Christopher G. Vann, Shelby C. Osburn, Bradley A. Ruple, Carlton D. Fox, Kristen S. Smith, Olivia M. Altonji, Zade M. Power, Annsley E. Cerovsky, C. Owen Ross, Andy T. Cao, Michael D. Goodlett, Kevin W. Huggins, Andrew D. Frugé, Kaelin C. Young, Michael D. Roberts
Abstract
O) tracer method. Pre- and Post-intervention testing in all participants was conducted using dual energy x-ray absorptiometry (DXA), VL ultrasound imaging, a peripheral quantitative computed tomography (pQCT) scan at the mid-thigh, and right leg isokinetic dynamometer assessments. Integrated MyoPS rates over a 24-h period were not significantly different (p < 0.05) between supplement groups following the first training bout. Regarding chronic changes, there were no significant supplement-by-time interactions in DXA-derived fat mass, lean soft tissue mass or percent body fat between supplementation groups. There was, however, a significant increase in VL thickness in PP versus CTL participants when the 6- and 10-week cohorts were pooled (interaction p = 0.041). There was also a significant increase in knee flexion torque in the 10-week PP group versus the CTL group (interaction p = 0.032). In conclusion, a higher-protein, defatted peanut powder supplement in combination with RT positively affects select markers of muscle hypertrophy and strength in an untrained, older adult population. Moreover, subanalyses indicated that gender did not play a role in these adaptations.