Document Type

Thesis

Degree Name

Master of Kinesiology (MKin)

Department

Kinesiology

Faculty/School

Faculty of Science

First Advisor

Tom Hazell

Advisor Role

Supervisor

Abstract

This study examined the effect of an acute session of low-load high-volume resistance training versus a more traditional high-load low-volume session on energy balance (EB). Five recreationally active males (age: 24±3 y; BMI: 25.8±1.5 kgm-2) completed three different sessions: 1) high-load (90% 1RM); 2) low-load (30% 1RM); and 3) CTRL (no exercise). Gas exchange (V̇O2), blood lactate, and subjective appetite perceptions were measured before each session, as well as at 0, 1, and 2 h post-exercise. Delayed onset muscle soreness (DOMS) in the quadriceps, pectorals, hamstrings, deltoids, and latissimus dorsi was measured at 24 and 48 h post-exercise. V̇O2 was increased following the 30% 1RM (D0.110 L×min-1, p<0.001, d = 1.41) and 90% 1RM (D0.08 L×min-1, p=0.002, d = 1.22) sessions compared to CTRL at 0 h post-exercise. Post-exercise energy expenditure (EE) was trending (p=0.088, ) to be greater following the 30% 1 RM session compared to CTRL (∆41 kcal, p=0.091, d = 1.30). The 30% 1RM session accumulated more plasma lactate at 0 and 1 h post-exercise than both 90% 1RM (D5.7 mmol×L-1, p<0.001, d = 2.65; D1.1 mmol×L-1, p=0.010, d = 2.10) and CTRL (∆13.0 mmol×L-1, p<0.001, d = 7.38; ∆1.8 mmol×L-1, p=0.001, d = 2.44) sessions. The 30% 1RM session subsequently resulted in lower appetite at both 0 (∆26 mm, p=0.003, d = -0.62) and 1 h (∆24 mm, p=0.005, d = -0.60) post-exercise compared to the 90% 1RM session, and was lower than CTRL at 0 (∆42 mm, p<0.001, d = -1.29), 1 (∆35 mm, p=0.001, d = -0.93), and 2 h (∆21 mm, p=0.017, d = -1.13) post-exercise. These results demonstrate a low-load high-volume resistance training session elevates post-exercise V̇O2/EE, blood lactate, and decreases subjective appetite compared to high-load low-volume suggesting more positive benefits to energy balance. However, due to the COVID-19 pandemic all results remain preliminary.

Convocation Year

2020

Convocation Season

Fall

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