Comparison of Postexercise Lipid Oxidation Rates Between Lower- and Upper-Body Resistance Training in Well-Trained
Alyssa L Parten1,2, Abbie E Smith-Ryan3, Kennan M Sanchez1
1Exercise Physiology Laboratory, Department of Kinesiology, The University of Alabama, Tuscaloosa, AL.
Introduction:
Lipid oxidation (LOx) is a relevant physiological process linked to metabolic health. Despite growing interest in resistance training (RT) as a means to influence substrate utilization, LOx responses in females remain poorly characterized, with no study examining whether lower- and upper-body RT elicits different LOx patterns during the recovery period following exercise. This distinction may be relevant because lower-body exercises involves greater fat-free mass (FFM) and energy expenditure, whereas upper-body exercises recruit less FFM, potentially influencing metabolic effects.
Purpose:
To determine if LOx rates after exercise differ between lower- and upper-body RT in well-trained females.
Methods:
Twenty-two females (age: 25.4 ± 5.6 yr, FFM: 44.5 ± 4.9 kg, mean relative strength: 1.1 ± 0.2) completed repetition-maximum tests in the barbell back squat (BS) and bench press (BP). From these, an equated volume-load (sets × repetitions × load) was determined using 65% 1 repetition-maximum of participants' BS and BP. Metabolic testing was completed before either the BS or BP, then immediately (IP), 30-, 60-, and 90-min postexercise.
Results:
No significant differences were found between BS or BP LOx rates ( P > 0.05). LOx relative to FFM averaged 1.57 ± 0.4 mg·kg -1 FFM·min -1 across both exercises from IP to 90-min postexercise, representing a 45% and 65% increase from baseline in the BP and BS, respectively. At 90-min post-RT, LOx reached 1.78 ± 0.37 mg·kg -1 FFM·min -1 (SEM = 0.08) for the BS and 1.65 ± 0.31 mg·kg -1 FFM·min -1 (SEM = 0.07) for BP, with no between-condition differences ( P > 0.05). Resting energy expenditure was not different between conditions ( P > 0.05), with a pooled average of 1.04 ± 0.13 kcal·min -1 from IP to 90-min post-RT.
Conclusions:
These data demonstrate that RT, differing in FFM but not volume-load, stimulates comparable LOx rates and resting energy expenditure responses during the postexercise recovery period. These findings support versatility in exercise prescription, indicating that RT of different muscle regions can produce similar acute metabolic outcomes.
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