Chapter 5 - Health & Lifestyles

Functional Movement: Mobility, Flexibility, and Stability

Introduction

  • Learning changes everything. ®

  • Source: Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, 16th Edition by Thomas D. Fahey, Paul M. Insel, Walton T. Roth, Claire E. Insel.

Learning Objectives

  • After reading this chapter, you should be able to:

    • Identify the benefits of flexibility, stability, stretching, and functional exercises.

    • List the factors that affect a joint’s flexibility.

    • Describe the types of stretching exercises and how they affect muscles.

    • Describe a successful flexibility program’s frequency, intensity, duration, volume, and progression.

    • List safe stretching exercises for major joints.

    • Explain how low-back pain can be prevented and managed.

Types of Flexibility

  • Flexibility: The ability of a joint to move through its normal, full range of motion is essential for general fitness and wellness.

    • Range of motion: The full motion possible in a joint.

    • Static Flexibility: The ability to hold an extended position at one end or point in a joint’s range of motion.

    • Dynamic Flexibility: The ability to move a joint through its range of motion with little resistance.

What Determines Flexibility?

Joint Structure

  • The structure of a joint affects its flexibility through:

    • Muscle elasticity and strength

    • Nervous system regulation

  • Types of joints:

    • Hinge Joints: e.g., fingers, knees, which lock when fully extended.

    • Ball-and-socket Joints: e.g., hip joints that enable movement in many directions.

  • Joint Capsules: Semielastic structures surrounding major joints, providing strength and stability but limiting movement.

  • Arthritis: A disorder characterized by joint pain, stiffness, and inflammation.

Muscle Elasticity and Length

  • Soft Tissues: Include skin, fat, linings of internal organs, connective tissues, tendons, ligaments, muscles, and nerves.

  • Collagen: White fibers providing structure and support in connective tissue.

  • Elastin: Yellow fibers that make connective tissue flexible.

  • Elastic Elongation: Temporary change in length of muscles, tendons, and supporting connective tissues.

  • Plastic Elongation: Long-term change in length of muscles, tendons, and connective tissues.

Nervous System Regulation 1

  • Proprioceptors: Nerves that send information about the muscular and skeletal systems to the nervous system.

  • When a muscle is stretched:

    • Proprioceptors detect changes in muscle length and send signals to the spinal cord.

    • The spinal cord sends a signal back to trigger a muscle contraction that resists the change and relaxes the opposing muscle, facilitating the contraction of the stretched muscle.

Nervous System Regulation 2

  • Rapid changes in muscle length stimulate receptors, causing significant muscle contractions.

    • Minor movements yield small reflex actions.

    • Stretches with rapid or bouncy movements may lead to injuries.

  • Proprioceptive Neuromuscular Facilitation (PNF): A stretching technique leveraging nerve activity to improve flexibility.

Benefits of Flexibility

Joint Health

  • Tight muscles and tissues around a joint can cause stress, leading to deterioration.

  • Poor flexibility can lead to abnormal joint lubrication and deteriorating cartilage.

Prevention of Low-Back Pain and Injuries

  • Poor spinal stability can induce pressure on nerves, leading to low-back pain.

  • Good hip and knee flexibility is protective for the spine.

    • Both high and low flexibility can increase injury risk.

    • Stretching programs are crucial for:

    • Older adults

    • Athletes in high-power sports

    • Workers with brief intense exertions

    • Sedentary individuals

  • Note: Static stretching before high-intensity activities may increase injury risk.

Additional Benefits of Flexibility

  • Relief of aches and pains.

  • Alleviation of muscle cramps.

  • Improved blood vessel health.

  • Enhanced body positioning and strength during sports and daily activities.

  • Maintenance of good posture and balance.

  • Promotion of relaxation and improved mobility.

Assessing Flexibility

  • Flexibility is joint-specific; there are no general tests.

  • The sit-and-reach test is commonly used to evaluate flexibility in the lower back and hamstrings.

Creating a Successful Flexibility Program

  • A successful program consists of:

    • Safe exercises executed effectively.

    • Goals of attaining normal flexibility in major joints.

    • Balanced flexibility to provide joint stability and facilitate movement.

    • Regular performance of stretching exercises using varied techniques.

Applying the FITT Principle

Frequency

  • The American College of Sports Medicine suggests stretching exercises at least 2-3 times a week; more often is better.

Intensity and Time (Duration)

  • Stretch muscles to slight tension or mild discomfort.

  • Hold stretches for 10–30 seconds, resting 30–60 seconds between stretches, and performing 2–4 repetitions totaling 90 seconds per exercise.

Sample Stretching Exercises

  • Head Turns and Tilts: Stretches neck muscles.

  • Towel Stretch: Targets triceps, shoulders, chest.

  • Across-the-body and Overhead Stretches: Stretches shoulders and upper back.

  • Upper-back Stretch: Focuses on upper back muscles.

  • Lateral Stretch: Works trunk muscles.

  • Step Stretch (Lunge): Stretches hips and thighs.

  • Side Lunge: Focuses on inner thigh and hip.

  • Inner-thigh Stretch: Targets inner thigh and hip.

  • Modified Hurdler Stretch: Works hamstrings and lower back.

Types of Stretching Techniques

  • Static Stretching: Gradual stretching and holding the position.

  • Ballistic Stretching: Uses force from movements to stretch.

  • Dynamic Stretching: Controlled movements through the range of motion, also known as functional stretching.

  • Proprioceptive Neuromuscular Facilitation (PNF): Uses muscle and joint reflexes for enhanced flexibility.

  • Passive Stretching: Involves outside force application.

  • Active Stretching: Utilizes contraction of opposing muscles.

  • Foam Rolling: Employs myofascial release using a foam roller.

Making Progress

  • Flexibility progress occurs through consistent effort.

  • Monitor progress based on body positioning during stretches; noticeable improvements may appear within 2-3 weeks.

  • Significant gains might take up to two months.

  • Stop increasing flexibility once a normal range of motion is achieved to prevent joint instability.

Exercises to Improve Flexibility

Program Guidelines

  • Incorporate exercises targeting all major joints; hold each position for 10–30 seconds, performing multiple repetitions with proper technique.

Specific Flexibility Exercises

  • Head Turns and Tilts

  • Towel Stretch

  • Across-the-body and Overhead Stretches

  • Upper-back Stretch

  • Lateral Stretch

  • Step Stretch (Lunge)

  • Side Lunge

  • Inner-thigh Stretch

  • Hip and Trunk Stretch

  • Modified Hurdler Stretch

  • Leg Stretcher

  • Lower-leg Stretch

  • Single-leg Deadlift

Preventing and Managing Low-Back Pain

  • Low-back pain ranks as the second most common ailment in the US.

    • Over 85% of Americans experience back pain by age 50.

  • Causes:

    • Weakened, inflexible muscles.

    • Poor posture/body mechanics.

Function and Structure of the Spine

  1. Key functions:

    • Structural support for the body, especially in the thorax.

    • Protects the spinal cord.

    • Supports bodily weight.

    • Attachment for muscles, tendons, and ligaments.

    • Allows neck and back movement.

  2. Components of the spine:

    • Vertebrae: Comprises 7 cervical, 12 thoracic, and 5 lumbar vertebrae.

    • Sacrum/coccyx: Comprised of fused vertebrae.

  3. Intervertebral Disk: Acts as a shock absorber; consists of a gel-filled nucleus surrounded by fibrous rings.

    • Nerve Roots: Branch from the spinal cord through vertebral spaces.

Core Muscle Fitness

Overview

  • Core Muscles: Stabilize the spine and help in force transfer between the upper and lower body, extending from the hips to the upper back.

  • Deep Core Muscles: Include internal obliques, transversus abdominis, spinal muscles, and hip muscles.

  • Superficial Core Muscles: Include rectus abdominis, external obliques, gluteus maximus, and hamstrings.

Functions of Core Muscles

  • Some core muscles contract to produce movement, while others provide stability or assist with muscle signaling/proprioception.

  • Effective low-back health exercises should require core stabilization through various movements.

Causes of Back Pain

  • Commonly originates from the lumbar region due to:

    • Poor endurance/strength in core muscles.

    • Excess body weight.

    • Poor posture or improper body mechanics during lifting/sports.

Preventive Measures

  • Maintaining a healthy weight, avoiding prolonged positions, using lumbar support, and warming up prior to exercise.

Managing Acute Back Pain

  • For sudden pain, applying cold followed by heat can reduce inflammation.

  • Short-term bed rest may relieve discomfort but should be limited.

  • Consult a physician if pain persists.

Managing Chronic Back Pain

  • Defined as pain lasting over three months, requiring varied treatment approaches:

    • Medications, physical therapy, yoga, acupuncture, and advice on posture, exercise, and mechanics.

Exercises for Low-Back Pain Prevention and Management

  • Conduct low-back exercises at least 3 days a week emphasizing muscular endurance.

  • Avoid spine exercises involving a full range of motions early in the morning.

  • Incorporate exercises targeting large supporting muscles critical for spinal stability.

Low-Back Pain Exercises

  • Cat Stretch

  • Step Stretch

  • Leg Stretcher

  • Trunk Twist

  • McGill Curl-up

  • Isometric Side Bridge

  • Spine Extensions

  • Wall Squat

  • Pelvic Tilt

  • Back Bridge

  • Stir the Pot

  • Kettlebell or Dumbbell Carry

Test Your Knowledge

  • Questions regarding static stretching, bed rest for back injuries, and the effectiveness of stretching methods.