The exercise that involves muscle contraction with resistance is called?

AIIMS Bhuvneshwar NO- 2018

Applied Physiology

Medium

Appeared in: AIIMS Bhuvneshwar NO- 2018

Explanation

Isokinetic exercise is defined as muscle contractions with resistance, where the resistance is provided by an external device at a constant rate of speed.
This type of exercise involves the muscle contracting and shortening at a constant velocity.
It is commonly used in rehabilitation settings for knee and elbow injuries, often utilizing specialized equipment like a continuous passive motion (CPM) device or dynamometer.
The key feature is that the resistance adapts to the force applied by the person, ensuring the muscle works at a consistent speed throughout the entire range of motion.

Option B: Aerobic exercise primarily focuses on improving cardiovascular and respiratory function. While it involves muscle activity, its main goal is endurance and oxygen utilization, not targeted resistance against a load.
Option C: Isotonic exercise involves muscle shortening (concentric) and lengthening (eccentric) against a constant load, like lifting a dumbbell. The speed of movement is variable, not constant, which differentiates it from isokinetic exercise.
Option D: Isometric exercise involves muscle contraction without any change in the muscle's length or joint movement. The muscle generates force, but it doesn't produce movement, such as when pushing against an immovable wall.

Visual 1: Infographic: A comparative chart showing the differences between Isokinetic, Isotonic, Isometric, and Aerobic exercises with simple icons for each.
Visual 2: Image: A patient using an isokinetic dynamometer for knee rehabilitation, highlighting the machine's role in controlling speed and resistance.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Types of Exercise and Muscle Contraction as background academic context rather than a clinical decision trigger.
Nurses play a key role in patient education and supervision for therapeutic exercises, especially post-surgery or injury. Understanding the differences helps in implementing physical therapy plans safely and effectively.
Isokinetic exercise provides measurable data on muscle strength, which is valuable for tracking progress in rehabilitation.
What if? A patient has an unstable joint and needs to build strength. Initially, isometric exercises would be the safest choice as they strengthen the muscle without moving the joint, minimizing the risk of further injury. Once stability improves, they could progress to isotonic or isokinetic exercises.

How to Approach the Question

First, identify the keywords in the question: "muscle contraction" and "resistance".
Next, recall the definitions of the four types of exercise listed in the options.
Differentiate each type based on its primary characteristics: Does the muscle change length? Is there joint movement? What is the nature of the resistance (constant load, constant speed, or none)?
Isotonic exercise involves a constant load but variable speed.
Isometric exercise involves tension but no movement.
Isokinetic exercise is uniquely defined by its constant speed against an accommodating resistance, which precisely matches the question's description.

Concept Tested & Keywords

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