Topics in Exercise Science and Kinesiology Volume 4: Issue 1, Article 12, 2023. Phase Angle (PhA) has emerged as a valuable measure in clinical and sports settings due to its predictive relationship with health and sports performance. Fitness is related to PhA, but the type of exercise training that is most influential over PhA has yet to be determined. The purpose was to explore the effects of endurance training (ET), strength-based resistance training (RT), and sprint-interval training (SIT) on PhA, resistance (R), and reactance (Xc) in men. Thirty-five recreationally-trained healthy young adult males (24±4 years) were randomly assigned to one of three training groups or a control group. All interventions were performed 3 times/week, for 4 weeks, with 48 hours between sessions. Training sessions for ET, RT, and SIT included 30 minutes of moderate-intensity (85% critical speed) treadmill running, 4 sets of 5 repetitions of the barbell back squat at 85% 1 repetition-maximum (1RM), or 4 sets of repeated inclined treadmill sprints designed to induce fatigue in 30-60 seconds, respectively. Baseline and post-intervention tests were performed using bioelectrical impedance analysis, the 3-minute all-out exercise test, and the back squat 1RM. ET significantly increased critical speed (Δ=5.16%; p<0.005), but subjects in this group exhibited lower PhA and Xc values. These changes were not significant (PhA: Cohen’s d=-0.44; Δ=-3.01%, p>0.005; Xc: Cohen’s d=-0.48; Δ=-4.82%, p>0.005). RT significantly increased muscular strength (Δ=12.92%; p<0.005) and this coincided with a trend for increased PhA and Xc values, but this was not significant (PhA: Cohen’s d=0.44, Δ=2.55%, p>0.005; Xc: Cohen’s d=0.20, Δ=3.52%, p>0.005). Exploratory data from this study showed that ET tended to decrease PhA and Xc, whereas RT tended to positively affect PhA and Xc in healthy young adult males. Future research should examine to see if these trends remain true because it has the potential to impact the way we optimize exercise prescriptions.
Short, Trevor and Yamada, Paulette
"The Effects of Different Training Types on Phase Angle in Men - An Exploratory Study,"
Topics in Exercise Science and Kinesiology: Vol. 4:
1, Article 12.
Available at: https://digitalscholarship.unlv.edu/scholarship_kin/vol4/iss1/12