Exercise Intermittent Isometric Handgrip and Blood Flow Restriction

Sarcopenia Clinical Trial

Official title:

Exercise Intermittent Isometric Handgrip Associated With Different Levels of External Vascular Compression: Acute Effects on Neuromuscular Response

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02384161
• Other study ID #: UFPernambucoMK
• Status: Completed
• Phase: N/A
• First received: February 23, 2015
• Last updated: December 7, 2015
• Start date: February 2015
• Est. completion date: December 2015

Study information

• Verified date: December 2015
• Source: Universidade Federal de Pernambuco
• Contact: n/a
• Is FDA regulated: No
• Health authority: Brazil: Ethics Committee
• Study type: Interventional

Clinical Trial Summary

Isometric handgrip exercises are used to explain the effects of fatigue on the strength and activation of the muscles involved. Blood flow available at the time of exercise can influence this fatigue process, as some studies demonstrate changes in the pattern of muscle recruitment and strength recovery when the exercise is performed in combination with an external total obstruction (through a pressure cuff or tourniquet ) blood flow. Low intensity exercises associated with external partial obstruction of blood flow has been widely used and studied, mainly due to its effect on increasing strength and muscle hypertrophy, often comparable to those observed in conventional exercises (ie, without external obstruction of blood flow) High intensity. Despite the vast literature on this method, some topics need to be better informed about the underlying neuromuscular physiology to such effects (strength and hypertrophy) and the process of fatigue during isometric exercises associated with partial obstruction of blood flow. The aim of this study is to evaluate the acute effects on neuromuscular response in healthy adults undergoing an intermittent isometric exercise protocol with different levels of external compression. In a study of the "crossover" male volunteers will be submitted to three intermittent isometric exercise protocols (with a load of 45% of maximum voluntary isometric strength) associated with three different levels of obstruction (held by a pressure cuff) blood flow (total obstruction, partial obstruction and free blood flow). The protocols will be performed on three different days (with a minimum of 48 hours between them). Will be considered as acute neuromuscular responses spending time to failure in the task, the electromyographic activity of the flexor muscles of the wrist and fingers, and the recovery curve of maximum voluntary isometric strength after exercise. The main hypothesis of this study is that exercise is performed when associated with partial obstruction of blood flow, the time spent until the failed job is similar to that seen when exercise is performed with free blood flow, and the recovery of strength and electromyographic activity will be similar to that observed in the exercise associated with total obstruction of blood flow.

Description:

Muscle fatigue is a process widely disbelieved and studied in the literature. Isometric handgrip exercises have been widely utilized to explain the effects of fatigue on the strength and activation of the muscles involved in certain exercises. Among the many factors that can influence the process of muscular fatigue, blood flow available at the time of exercise is an aspect of fundamental importance, as some studies demonstrate changes in the pattern of muscle recruitment and strength recovery when the exercise is performed associated with an external obstruction of blood flow.

Resistance exercise associated with partial obstruction of blood flow (ischemic exercise) is gaining notoriety in the scientific environment, mainly due to strong evidence indicating that such activity can increase strength and muscle hypertrophy, even when performed with low intensity loads. The underlying neuromuscular mechanisms such effects are still partially unknown, and some studies have shown differences in the recruitment of motor units during its execution, and the relationship fatigue-strength after ischemic resistance exercise. Nevertheless, there are still some gaps in the literature regarding the neuromuscular responses during and after unilateral intermittent isometric handgrip protocols to failure in the associated task to partial obstruction of blood flow.

Evidence suggests that the total obstruction of blood flow decreases performance and accelerates the recovery of the isometric strength after fatigue protocols, but the effects of partial obstruction on these variables remain unknown. In the above so far, it seems that isometric fatigue protocols associated with remote obstruction (away from the venue of the exercise) blood flow can influence acutely in strength members at a distance, but it is not known as a protocol unilateral isometric fatigue associated with partial and complete obstruction of blood flow can influence acutely the strength of the contralateral limb (ie, not subject to any type of exercise). Thus, the realization of this study is justified by the possibility of answering these questions still little studied, with regard to neuromuscular factors of ischemic resistance training.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 18
• Est. completion date: December 2015
• Est. primary completion date: December 2015
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Male
• Age group: 21 Years to 40 Years

Eligibility

Inclusion Criteria:

• Volunteers classified as irregularly active or active

• Volunteers ranked within the normal range (18.5 to 24.9 kg / m2), the Body Mass Index (BMI).

Exclusion Criteria:

• Smokers volunteers will be excluded, that are using vasoactive drugs and having fracture history in upper limbs; hypertension, venous insufficiency, cardiac insufficiency or any other cardiovascular disease; epilepsy, stroke or some other neurological disease or any other condition that prevents you from performing the exercise protocol.

Study Design

Allocation: Randomized, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Basic Science

Related Conditions & MeSH terms

• Sarcopenia

Intervention

Other:
• Isometric exercise Intermittent
Intermittent isometric exercise is characterized by an interval muscle contraction (one period and another relaxed contracted period) in which there is no generation of voltage change in the length of the muscle fiber.

Locations

Country	Name	City	State
Brazil	Federal University of Pernambuco	Recife	Pernambuco

Sponsors (1)

Lead Sponsor	Collaborator
Universidade Federal de Pernambuco

Country where clinical trial is conducted

Brazil, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Maximal voluntary isometric strength.	Recovery of maximal voluntary isometric strength in the dominant member.	3 months	No
Primary	Time to task failure.	Recovery of time to task failure in the dominant member.	3 months	No
Primary	electromyography activity.	Recovery electromyographic activity in the dominant member.	3 months	No
Secondary	Contralateral maximum voluntary isometric strength (non-dominant limb).	Contralateral maximum voluntary isometric strength (non-dominant limb).	3 months	No