Eccentric Resistance Training With Blood Flow Restriction on Muscle Function

Not Applicable

Withdrawn

• Conditions: Blood Flow Restriction
• Interventions: Other: Eccentric plus blood-flow restriction; Other: Exercise

• Registration Number: NCT04977804
• Lead Sponsor: Utah State University

Brief Summary

The study will determine the effects of adding blood flow restriction to eccentric training to assess whether this increases the improvements of muscle strength and size.

Detailed Description

Subjects will be randomly assigned to two groups: an eccentric only resistance training group or an eccentric training plus blood flow restriction group. Subjects will train at a moderately low intensity on a multiple-joint eccentric device. Those in the blood flow restriction will wear blood flow restriction cuffs on their upper thighs to reduce blood flow during the brief protocol. The training session will occur twice per week and will last \~5 minutes, including a one minute warm up, a one minute cool down and a three minute workout phase. The training program will last 7 weeks. Testing will be conducted at baseline (following a one session familiarization), 4 weeks and after the end of the 7 week training period. Assessments will focus on muscle strength, function, and morphology (size).

Study Timeline

• Study First Submitted: 2021-07-20
• Study First Submitted QC: 2021-07-24
• Study First Posted: 2021-07-27
• Status Verified: 2023-11
• Last Update Submitted: 2023-11-30
• Last Update Posted: 2023-12-07
• Study Start: 2024-03-30
• Primary Completion: 2025-06-01
• Study Completion: 2025-12-01

Recruitment & Eligibility

• Status: WITHDRAWN
• Sex: All
• Target Recruitment: Not specified

Inclusion Criteria

• 18-30 years of age
• currently engaged in some form of resistance training between 1-3 times per week
• must have been training aerobically, but no more than 3 hours a week for the past six months

Exclusion Criteria

• Must not have had any surgery of the lower limbs within the past 1 year period
• Must not have any neuromuscular disorder (e.g., Muscular dystrophy etc.)
• < 76 inches tall (in order to fit on the training machine)
• Maximal strength of < 725 lbs for the eccentric training device
• If any of the subjects are pregnant or plan to be pregnant in the duration of the protocol.

For those randomized to the BFR group, if any of the subject's thighs are too large for the BFR cuffs (greater than 68 cm).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Eccentric plus blood-flow restriction	Eccentric plus blood-flow restriction	This is the experimental condition involving the eccentric resistance training with blood flow restriction.
Eccentric only training	Exercise	This is the experimental control; where this group will be used as the standard active comparison condition.

Primary Outcome Measures

Name	Time	Method
Muscle mass	7 weeks	dual energy x-ray absorptiometry device (DEXA) the Hologic Horizon W Dual X-ray absorptiometry (Hologic Canada ULC, Mississauga, ON, Canada) will be used to assess appendicular (lower body) mean mass.
Eccentron maximal muscle strength	7 weeks	Eccentric muscle strength will be assessed via Eccentron (BTE Technologies, Inc., USA), an seated isokinetic dynamometer.
Local muscle hypertrophy	7 weeks	Muscle size changes of the quadriceps muscle measured an ultrasound device (GE NextGen LOGIQ, Tampa, Florida, USA).
Muscle function	7 weeks	Vertical jump height will assess 3 maximal countermovement attempts on a jump mat (Just Jump Technologies, Huntsville, AL, USA) that measures jump height based on flight time.

Secondary Outcome Measures

Name	Time	Method
Muscle soreness	7 weeks	local muscle soreness will be assessed throughout the duration of the intervention period using a Wagner force algometer.

Trial Locations

Locations (1)

Utah State Universtiy; 🇺🇸 Logan, Utah, United States