Lousiana State University
Baton Rouge, Louisiana, 70803, United States
NCT Number: NCT03723226
Blood flow restricted (BFR) exercise has been shown to improve skeletal muscle adaptations to resistance exercise. BFR uses blood pressure cuffs (i.e., tourniquets) to reduce skeletal muscle blood flow during resistance exercise. One benefit of BFR is that skeletal muscle adaptations to resistance exercise training including muscle hypertrophy and increases in strength can be achieved at lower-loads (e.g., 25-30% 1RM), that are often comparable to more traditional resistance training loads (70-85% 1RM). However, the impact that low-load BFR resistance exercise has on muscle quality and bioenergetics is unknown. The present study will examine the impact of 6 weeks of low-load, single-leg resistance exercise training with or without personalized BFR on measures of muscle mass, strength, quality, and mitochondrial bioenergetics. The investigators will recruit and study up to 30, previously sedentary, healthy, college-aged adults (18-40 years). The investigators will measure muscle mass using Dual Energy X-Ray Absorptiometry and muscle strength and endurance using isokinetic testing. The investigators will normalize knee extensor strength to lower limb lean mass to quantify muscle quality. The investigators will also use near infrared spectroscopy (NIRS) to measure mitochondrial oxidative capacity in the vastus lateralis. Finally, the investigators will measure markers of systemic inflammation and markers of muscle damage using commercially available ELISA assays.
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Notify Me18 year–40 year
All sexes
Interventional
Not applicable
Baton Rouge, Louisiana, 70803, United States
Healthy volunteers accepted: Yes
Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
.
Exclusion criteria
.
Subjects allocated to Low Load Resistance Exercise will undergo 6 weeks of single-legged low load (25%) resistance exercise. Subjects will then perform 4 sets of 30, 15, 15 and 15 repetitions at 25% of their 1RM for the single-legged leg press and single-legged knee extensions. Their contralateral leg will serve as within subject control.
Subjects allocated to Low Load Resistance Exercise + BFR will undergo 6 weeks of single-legged low load (25%) resistance exercise with blood flow restriction (60% occlusion pressure). Subjects will then perform 4 sets of 30, 15, 15 and 15 repetitions at 25% of their 1RM for the single-legged leg press and single-legged knee extensions. Their contralateral leg will serve as within subject control.
Time frame: Changes from baseline (pre-training) to follow-up (about 48-72 hours post-training).
Changes in mitochondrial oxidative capacity will be measured using near infrared spectroscopy (NIRS).
Time frame: Changes from baseline (pre-training) to follow-up (about 48-72 hours post-training)
Changes in muscle mass will be measured by Dual Energy X-ray Absorptiometry
Time frame: Changes from baseline (pre-training) to follow-up (about 48-72 hours post-training)
Changes in muscle strength measured using isokinetic dynamometry
Time frame: Changes from baseline (pre-training) to follow-up (about 48-72 hours post-training)
Changes in muscle endurance measured using isokinetic dynamometry
Louisiana State University and A&M College
Other
Impact of Low-Intensity Resistance Exercise With and Without Blood Flow Redistricted (BFR) on Muscle Mitochondrial Oxidative Capacity
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