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Completed

NCT Number: NCT04270695

Blood Flow Restriction Training Combined With Abdominal draw-in Maneuver on Transverse Abdominis Strengthening

This study expects to provide a new alternative way to improve the muscle activation, strength and activation of transverse abdominis in abdominal draw-in maneuver combined with blood flow restriction.

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Key information

Conditions

Blood Flow Restriction Transverse Abdominis draw-in Maneuver

Age range

20 year–35 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

China Medical University

Taichung, Taiwan

About this study

The transverse abdominis (TrA) is the deepest muscle layer of lateral and anterior abdominal wall and also known as a significant component of core stability. Abdominal draw-in maneuver (ADIM) is the main for the strengthening of the deep muscle, however, sufficient activation of TrA by ADIM is limited. Blood flow restriction (BFR) training is a technique combined with low intensity exercise that produces similar results to high intensity training. However, there is few evidences for BFR training on core muscles.

Healthy adults (age ranged 18-34 years and BMI between 18.5~24.99) were randomly recruited in the study. For the intervention group, an inflatable cuff (14 cm in width * 84 cm in length) is warped around abdominal muscles below ribs which may cause to at least 60% restriction of blood flow detected by Power Doppler ultrasonography. All participants are instructed to perform ADIM both condition of BFR and BFR-free twice a week, for six weeks. Outcome measurements include Double leg lowering test (DLLT) for muscle strength, brightness mode ultrasound (USD) for muscle hypertrophy and electromyography (EMG) muscle activation. The same physical therapist will do the measurement at first week, third week and the sixth week.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy subjects
  • 20~35 years old
  • BMI 18.5~24.99

Exclusion criteria

  • Hypertension
  • Have cardio-vascular disease
  • Used to have abdominal operation or wound
  • Have spinal surgeries or deformities
  • Known neuromuscular or joint disease
  • Pregnant

Treatment and study plan

Blood Flow Restriction

Behavioral

an inflatable cuff (14 cm in width * 84 cm in length) is warped around abdominal muscles below ribs which may cause to at least 60% restriction of blood flow detected by Power Doppler ultrasonography. All participants are instructed to perform abdominal draw-in maneuver.

sham blood flow restriction

Behavioral

an inflatable cuff (14 cm in width * 84 cm in length) is warped around abdominal muscles below ribs without inflation. All participants are instructed to perform abdominal draw-in maneuver.

Primary outcomes

  1. Muscle Thickness Change of Transverse Abdominis

    Time frame: 3,4,5 weeks

    muscle thickness change on week3, 4 and 5 compared with baseline

Secondary outcomes

  1. Internal Oblique Thickness Change

    Time frame: baseline,3,4,5 weeks

    Data represents the muscle thickness change on week 3, 4 and 5 compared with baseline. The thickness of the muscle was calculated by the differences between the muscle thickness during contraction and the muscle thickness during resting position. If the muscle thickness during contraction was smaller than the muscle thickness during the resting position, therefore, the values would be negative. The values in baseline presented as negative may be because the internal oblique muscle thickness during contraction was smaller before receiving any training. Previous studies stated that after receiving ADIM and BFR training, the internal oblique muscle thickness will be thicker. Therefore, it was reasonable that the results in baseline presented negative values while the values became positive after receiving training.

  2. External Oblique Thickness Change

    Time frame: baseline,3,4,5weeks

    Data represents the muscle thickness change on week 3, 4 and 5 compared with baseline. The thickness of the muscle was calculated by the differences between the muscle thickness during contraction and the muscle thickness during resting position. If the muscle thickness during contraction was smaller than the muscle thickness during the resting position, therefore, the values would be negative. The values in baseline presented as negative may be because the external oblique muscle thickness during contraction was smaller before receiving any training. After receiving ADIM and BFR training, the tranverse abdominis and internal oblique muscle thickness will be thicker while the external oblique will be thinner due to the compression from the TrA and IO muscles.

Sponsors and collaborators

Lead sponsor

China Medical University Hospital

Other

Registry information

Official study title

Effects of Blood Flow Restriction Training Combined With Abdominal draw-in Maneuver on Transverse Abdominis Strengthening

Important dates

Study start
2020
Primary completion
2021
Study completion
2021
First posted
Feb 17, 2020
Registry last updated
Aug 21, 2023

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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