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December 4, 2024Journal of Functional Morphology and KinesiologyOpen Access

Acute Responses of Low-Load Resistance Exercise with Blood Flow Restriction

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Why the study?

Short-term use of blood flow restriction resistance exercise may cause acute neuromuscular fatigue and higher exertion ratings, prompting examination of acute physiological responses to low-load exercise with BFR versus higher-load non-BFR exercise.

Does low-load resistance exercise with blood flow restriction alter acute physiological responses compared to higher-load non-BFR exercise in recreationally trained individuals?

Population

13 recreationally trained males (n = 6) and females (n = 7)

Comparison

Low-load resistance exercise with BFR vs higher-load non-BFR resistance exercise

Design

Randomized cross-over study

Authors

AJAndrew R. JagimJSJ SchulerESElijah Szymanski

Discussion

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Overview

Low-load BFR may enable higher volume with less fatigue; leaves open long-term adaptations or clinical utility.

Key Points

  • To investigate the acute physiological and neuromuscular fatigue responses to low-load resistance exercise combined with blood flow restriction compared to conventional high-load resistance exercise.
  • Thirteen recreationally trained adults (n = 6 males, n = 7 females) completed a randomized crossover trial comparing low-load squats (30% 1RM) under 50% limb occlusion pressure against high-load squats (60% 1RM) without restriction.
  • Participants performed four sets of back squats per condition, with assessments evaluating completed repetitions, training load volume, blood lactate, countermovement jump height, and perceived exertion.
  • Participants completed significantly more total repetitions under blood flow restriction compared to high-load exercise (75.0 ± 0.0 vs. 68.23 ± 9.27 reps; p = 0.015; ES = 1.03), despite a lower total lifted volume (2380 ± 728 vs. 4756 ± 1538 kg; p < 0.001; ES = 1.97).
  • Blood lactate increases from baseline were significantly greater after high-load exercise (11.61 mmol/L, 95% CI: 9.93 to 13.28) than after low-load restricted exercise (5.98 mmol/L, 95% CI: 4.30 to 7.65; time-by-condition p < 0.001).
  • Countermovement jump height dropped significantly following high-load squats (-6.01 cm, 95% CI: -9.14 to -2.88; p < 0.001) but remained preserved following restricted low-load squats (-1.50 cm, 95% CI: -1.50 to 4.51; p = 0.312; interaction p = 0.043).

Structured PICO

Does low-load resistance exercise with blood flow restriction alter acute physiological responses compared to higher-load non-BFR exercise in recreationally trained individuals?

P
Population
13 recreationally trained adults (6 males, 7 females), mean age 20 ± 1 years, BMI 24.4 ± 2.2 kg/m², with 4 ± 2 years of training experience.
I
Intervention
Low-load resistance exercise (back squats at 30% of estimated 1RM) with blood flow restriction (BFR) at 50% limb occlusion pressure.
C
Comparator
Higher-load resistance exercise (back squats at 60% of estimated 1RM) without blood flow restriction (non-BFR).
O
Outcome
Acute physiological responses including blood lactate, countermovement jump (CMJ) height, ratings of perceived exertion (RPE), total repetitions, and training load volume measured pre- and post-exercise.surrogate

Low-load resistance exercise with blood flow restriction allows for higher training volume with lower metabolic stress and reduced neuromuscular fatigue compared to higher-load exercise without restriction.

Cite This Study

Jagim et al. (2024) studied this question.

synapsesocial.com/papers/6a701edbfebe604dd708ea6bhttps://doi.org/10.3390/jfmk9040254
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