Influence of an Inspiratory Muscle Fatigue Protocol on Healthy Youngs on Respiratory Muscle Strength and Heart Rate Variability

Sierra Varona SL

Status: Not yet enrolling

Conditions: Healthy

Treatments: Other: Inspiratory muscle training

Study type: Interventional

Funder types: Other

Identifiers

NCT06278714

0012

Details and patient eligibility

About

Respiratory muscle training represents an effective method increasingly utilized in both sports and healthcare domains, employing various devices, among which threshold devices are prominent. The aim of this study is to determine the relationship between inspiratory muscle fatigue and maximal inspiratory pressure, diaphragmatic strength (guided by ultrasound image) and heart rate variability.

According to our hypothesis, the execution of a protocol inducing inspiratory muscle fatigue in healthy youngs could influence cardiorespiratory function.

In this study, subjects will be divided into three groups: the experimental group , the activation group and the control group.

Measurements of variables, such as maximal inspiratory pressure, heart rate variability and diaphragmatic strength (ultrasound image), will be conducted.

Full description

This is a randomized control trial. The experimental group (EG) will perform the diaphragmatic fatigue protocol using a specific inspiratory endurance test, in which volunteers, one-on-one, and in a single session, will breathe against submaximal inspiratory loads equivalent to 60% of their Maximum Inspiratory Pressure (MIP) through a threshold valve device. The participants will follow a free pattern of breathing until they are unable to establish flow during at least 3 maximum inspiratory efforts.

The activation group (AG) will perform the protocol of 2 sets of 30 repetitions at 40% of their MIP, one-on-one, and in a single session, using a threshold valve device.

The control group will do a seat and wait.

The interventions will be supervised by a physiotherapist. The primary outcomes will be

Respiratory muscle strength will be assessed using a respiratory pressure meter or manometer designed, and with ultrasound image measuring the cross sectional area of the diaphragm at 8-9th rib level and speed of contraction with a deep and fast inspiratory manoeuver. This will be done immediately before intervention and immediately after intervention

Heart rate variability (HRV) will be assessed using a heart rate sensor Polar H10.

Enrollment: 18 estimated patients

Sex: All

Ages: 18 to 45 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Aged between 18-45 years.
• Non-smoker.
• Engaged in sports activity at least 3 times a week for a minimum of one year.

Exclusion criteria

• Having a medical condition that impedes engaging in physical activity.
• Individuals with compromised cognitive capacities.
• Subjects with any chronic disease (cardiorespiratory, neurological, metabolic, oncological, etc.).
• Subjects with tympanic perforation or middle-inner ear pathology.
• Subjects who have undergone lower limb surgery within the past 12 months.
• Subjects experiencing an active episode of lower limb pain.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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18 participants in 3 patient groups

Intervention group

Experimental group

Description:

The EG (experimental group) will perform the diaphragmatic fatigue protocol using a specific inspiratory endurance test, in which volunteers, one-on-one, and in a single session, will breathe against submaximal inspiratory loads equivalent to 60% of their MIP (Maximum Inspiratory Pressure) through a threshold valve device. The participants will follow a free pattern of breathing until they are unable to establish flow during at least 3 maximum inspiratory efforts.

Treatment:

Other: Inspiratory muscle training

Control group

No Intervention group

Description:

they will not receive any intervention. Just sit and wait the same amount of time that the intervention and the activation group needs to finish their protocol (around 10 minutes)

Activation group

Active Comparator group

Description:

The activation group will perform the protocol of 2 sets of 30 repetitions at 40% of their MIP, one-on-one, and in a single session, breathing against submaximal inspiratory loads using a threshold valve device. The participants will follow a free pattern of breathing until complete the protocol.

Treatment:

Other: Inspiratory muscle training