Movement, Exercise, and Mobility: The Skeletal and Muscular Systems in Personal Health

Activity and the Skeletal System

Role of the Skeletal System in Movement

The skeletal system is fundamental to movement and overall body function. It provides structure, protection, and support for the body, and interacts closely with muscles to enable motion.

• Support: The skeleton supports soft tissues and maintains body shape.

• Protection: Bones protect vital organs (e.g., skull protects the brain, ribs protect the heart and lungs).

• Attachment Surfaces: Muscles, tendons, and ligaments attach to bones, facilitating movement.

• Storage: Bones store minerals (such as calcium and phosphorus) and fat.

• Blood Cell Production: Bone marrow produces red and white blood cells.

Freely Movable Joints

Joints are areas where two or more bones meet, allowing for various types of movement. Freely movable joints are classified by their structure and movement capabilities.

• Ball and Socket: Allows movement in all directions (e.g., shoulder, hip).

• Condyloid: Permits movement but not rotation (e.g., wrist).

• Gliding: Allows sliding movements (e.g., intercarpal joints in the wrist).

• Hinge: Allows flexion and extension (e.g., elbow, knee).

• Pivot: Allows rotation (e.g., atlas and axis in the neck).

• Saddle: Allows movement in two planes (e.g., thumb).

Bones Classified by Shape

Bones are classified based on their shape, which relates to their function.

• Long Bones: Found in arms and legs; contribute to height and length.

• Short Bones: Found in wrists and ankles; facilitate movement.

• Flat Bones: Thin bones such as ribs and skull; provide protection and shape.

• Irregular Bones: Complex shapes, such as vertebrae and jaw.

Example: The bones in the wrist are classified as short bones.

Joint Movements

Types of Joint Movements

Joints allow for a variety of movements, each with specific terminology.

• Abduction: Movement away from the midline.

• Adduction: Movement toward the midline.

• Circumduction: Moving a limb in a circular motion.

• Flexion: Decreasing the angle between two bones.

• Extension: Increasing the angle between two bones.

• Hyperextension: Extension beyond the normal range.

• Dorsiflexion: Backward bending of the hand or foot.

• Plantar Flexion: Forward bending of the foot (pointing toes).

• Rotation: Turning a bone around its axis.

• Internal/External Rotation: Rotating toward or away from the center of the body.

• Supination: Turning the palm upward.

• Pronation: Turning the palm downward.

• Inversion: Turning the sole of the foot inward.

• Eversion: Turning the sole of the foot outward.

Example: Moving a patient's leg in a circle is circumduction.

Muscle Types and Functions

Three Types of Muscles

Muscles are classified based on their structure and function.

• Skeletal Muscle: Voluntary muscles attached to bones; responsible for movement.

• Cardiac Muscle: Involuntary muscle found only in the heart.

• Smooth (Visceral) Muscle: Involuntary muscle found in internal organs.

Important Functions of Muscles

• Motion: Muscles contract to produce movement.

• Posture Maintenance: Muscles stabilize the body.

• Support: Muscles support soft tissues and organs.

• Heat Production: Muscle activity generates heat, helping regulate body temperature.

Nervous System and Muscle Contraction

Effect of Nervous System on Muscle Contraction

The nervous system controls muscle contraction through a series of impulses and responses.

• Neurons: Conduct impulses throughout the body.

• Afferent Pathways: Carry information from peripheral receptors to the central nervous system (CNS).

• Processing: CNS processes information and determines response.

• Efferent Pathways: Carry responses from CNS to skeletal muscles via the somatic nervous system.

Postural Reflexes

• Labyrinthine Sense: Maintains balance and orientation.

• Proprioceptor/Kinesthetic Sense: Awareness of body position and movement.

• Visual/Optic Reflexes: Use visual cues to maintain posture.

• Extensor/Stretch Reflexes: Maintain muscle tone and posture.

Safe Patient Handling and Mobility (SPHM)

Ergonomics and Injury Prevention

Ergonomics involves designing tasks and equipment to fit the worker's capabilities, reducing injury risk.

• Variables Leading to Injury: Uncoordinated lifts, high exertion, awkward postures, manual lifting, repetitive tasks, prolonged standing.

Factors Influencing Mobility

• Developmental Considerations: Age and growth affect mobility.

• Physical Health: Illness or injury can limit movement.

• Muscular, Skeletal, or Nervous System Problems: Directly impact mobility.

• Other Body Systems: Conditions affecting other systems may influence mobility.

• Mental Health: Psychological factors can affect activity levels.

• Lifestyle, Attitude, Values: Personal choices and beliefs influence activity.

• Fatigue and Stress: Reduce motivation and ability to move.

• External Factors: Environment and resources affect mobility.

Types of Exercise

Classification of Exercise

• Isotonic: Muscle shortens and active movement occurs (e.g., jogging).

• Isometric: Muscle contracts without shortening (e.g., holding a plank).

• Isokinetic: Muscle contracts with resistance (e.g., using exercise machines).

Example: Jogging is an isotonic exercise, not isometric.

Benefits and Risks of Exercise

Benefits to the Cardiovascular System

• Increased Heart Efficiency: Heart pumps more effectively.

• Decreased Heart Rate and Blood Pressure: Reduces strain on the heart.

• Improved Blood Flow: Enhances circulation.

• Improved Venous Return: Helps prevent blood pooling.

• Increased Fibrinolysin: Reduces risk of blood clots.

Benefits to the Respiratory System

• Improved Alveolar Ventilation: Enhances oxygen exchange.

• Decreased Work of Breathing: Makes breathing easier.

• Improved Diaphragmatic Excursion: Increases lung capacity.

Benefits to the Musculoskeletal System

• Increased Muscle Strength and Flexibility: Enhances movement and reduces injury risk.

• Improved Coordination: Facilitates complex movements.

• Reduced Bone Loss: Prevents osteoporosis.

• Improved Nerve Impulse Transmission: Enhances reaction time.

Benefits to Metabolic and GI Systems

• Increased Triglyceride Breakdown: Promotes fat loss.

• Increased Gastric Motility: Improves digestion.

• Increased Body Heat Production: Helps regulate temperature.

• Increased Appetite and Intestinal Tone: Supports healthy digestion and elimination.

• Weight Control: Helps maintain healthy body weight.

Risks Related to Exercise

• Cardiac Events: Exercise may trigger heart problems in susceptible individuals.

• Orthopedic Discomfort: Risk of injury to bones, joints, or muscles.

• Other Health Problems: Overexertion or improper technique can cause harm.

Effects of Immobility

Body Systems Affected by Immobility

Immobility can negatively impact multiple body systems:

• Cardiovascular: Increased risk of blood clots, decreased cardiac efficiency.

• Respiratory: Reduced lung capacity, risk of pneumonia.

• Musculoskeletal: Muscle atrophy, bone loss.

• Metabolic: Decreased metabolism, risk of weight gain.

• Gastrointestinal: Constipation, decreased appetite.

• Urinary: Risk of infection, kidney stones.

• Skin: Pressure ulcers.

• Psychosocial: Depression, anxiety.

Assessment and Prevention

Health History and Physical Assessment

• Daily Activity Level: Frequency and type of movement.

• Endurance: Ability to sustain activity.

• Exercise/Fitness Goals: Personal objectives for health.

• Mobility Problems: Any limitations or difficulties.

• Physical/Mental Health Alterations: Conditions affecting movement.

• External Factors: Environmental influences.

• Ease of Movement: Observing how easily a person moves.

• Gait and Posture: Walking pattern and body alignment.

• Joint Structure and Function: Range of motion and stability.

• Muscle Mass, Tone, Strength: Physical assessment of muscles.

• Endurance: Ability to perform activities over time.

Variables Leading to Back Injury in Health Care Workers

• Uncoordinated Lifts: Improper technique increases risk.

• Manual Lifting Without Assistive Devices: Increases strain.

• Lifting When Fatigued: Reduces strength and coordination.

• Repetitive Movements: Lead to cumulative injury.

• Standing for Long Periods: Causes fatigue.

• Transferring/Repositioning Uncooperative Patients: Increases risk.

Body Mechanics and Patient Handling

Proper Body Mechanics

• Use Proper Movement: Maintain alignment and balance.

• Prevent and Correct Posture Problems: Reduce injury risk.

• Enhance Coordination and Endurance: Improve efficiency.

Equipment and Assistive Devices

• Gait Belts: Provide support during transfers.

• Stand-Assist and Repositioning Aids: Help move patients safely.

• Lateral-Assist Devices: Facilitate side-to-side movement.

• Friction-Reducing Sheets: Reduce effort during transfers.

• Mechanical Lateral-Assist Devices: Powered equipment for moving patients.

• Transfer Chairs: Specialized chairs for patient movement.

• Powered Stand-Assist and Full-Body Lifts: Mechanized devices for safe lifting.

Positioning Patients

• Pillows, Mattresses, Adjustable Beds: Support and comfort.

• Bed Side Rails, Trapeze Bar: Aid in movement and safety.

• Protective Positions: Fowler’s, supine, side-lying, Sims’, prone, oblique.

Example: The oblique position reduces pressure on the trochanter region compared to the side-lying position.

Patient Movement and Physical Conditioning

Moving, Turning, or Transferring Patients

• Turning in Bed: Prevents pressure ulcers.

• Moving Up in Bed: Maintains comfort and alignment.

• Bed to Stretcher/Chair: Safe transfer techniques.

• Range-of-Motion Exercises: Maintain joint flexibility (active and passive).

Physical Conditioning

• Quadriceps and Gluteal Setting Drills: Strengthen leg muscles.

• Push-Ups: Build upper body strength.

• Dangling: Sitting on the edge of the bed to prepare for standing.

Mechanical Aids for Walking

• Walker: Provides stability.

• Cane: Assists balance.

• Braces: Support weakened limbs.

• Crutches: Allow mobility with reduced weight-bearing.

Summary Table: Types of Exercise

Type of Exercise	Muscle Action	Example
Isotonic	Muscle shortens, active movement	Jogging, walking, swimming
Isometric	Muscle contracts, no shortening	Plank, wall sit
Isokinetic	Muscle contracts with resistance	Resistance training machines

Summary Table: Patient Positions

Position	Description	Purpose
Fowler's	Semi-upright, 45-60 degrees	Promotes breathing, comfort
Supine	Lying flat on back	Rest, examination
Side-lying/Lateral	Lying on side	Reduces pressure on back
Sims'	Side-lying with one leg flexed	Rectal procedures
Prone	Lying on stomach	Improves oxygenation
Oblique	Variation of side-lying	Reduces pressure on trochanter

Additional info: Academic context was added to clarify muscle types, exercise classifications, and patient positioning. Definitions and examples were expanded for clarity and completeness.