8.7 Aging and System Changes

Question 1

What is the main idea behind aging and system changes?

Answer 1

Aging is heterogeneous—people of the same age can have very different levels of physical function.

Question 2

What is the continuum of function among older adults?

Answer 2

It ranges from physically elite to physically dependent or disabled.

Question 3

Who are considered “physically elite” older adults?

Answer 3

Those who engage in competitive sports and demonstrate optimal aging.

Question 4

How are “physically fit” older adults characterized?

Answer 4

They participate in moderate physical work, sports, and hobbies.

Question 5

Who are “physically independent” older adults?

Answer 5

They perform all basic and instrumental activities of daily living (BADLs and IADLs) independently.

Question 6

What defines a “physically frail” older adult?

Answer 6

They can perform basic ADLs but may require help with instrumental ADLs like housekeeping or shopping.

Question 7

Who are “physically dependent or disabled” older adults?

Answer 7

Those dependent for some or all basic ADLs and typically require full-time assistance or institutional care.

Question 8

By how much can lower extremity muscle strength decrease between ages 30 and 80?

Answer 8

As much as 40%.

Question 9

Which declines more with age—muscle strength or endurance?

Answer 9

Strength declines more; endurance is relatively preserved.

Question 10

In which body region is muscle mass loss greater with age?

Answer 10

The lower extremities.

Question 11

What replaces dying muscle cells as we age?

Answer 11

Connective tissue and fat.

Question 12

Which muscle fiber types are lost with age?

Answer 12

Both type I and type II fibers, though evidence suggests they may blend with characteristics of both.

Question 13

What happens to the number of motor units with aging?

Answer 13

They decline, along with both large and small myelinated fibers.

Question 14

How does aging affect the neuromuscular junction?

Answer 14

It undergoes degenerative changes, reducing muscle contractile capacity.

Question 15

Which type of contraction is most affected by aging?

Answer 15

Concentric contractions, especially rapid ones.

Question 16

What postural changes occur with age-related flexibility loss?

Answer 16

Flexed or stooped postures due to decreased spinal flexibility and range of motion.

Question 17

What happens to somatosensation with age?

Answer 17

It decreases, especially in the presence of peripheral neuropathy.

Question 18

How is reduced somatosensation related to fall risk?

Answer 18

Decline in sensory function correlates with slower gait speed and increased fall risk.

Question 19

How does vision change affect older adults’ gait?

Answer 19

Poor vision leads to impaired walking and reduced ability to anticipate obstacles.

Question 20

How do older adults compensate for visual decline while walking?

Answer 20

They rely more heavily on visual monitoring of their terrain.

Question 21

How does vestibular function change with age?

Answer 21

It declines, contributing to slower walking and reduced stability.

Question 22

How does aging affect cognitive involvement in motor performance?

Answer 22

Older adults require more cognitive control and attention for stability and balance recovery.

Question 23

What is the relationship between fear of falling and walking patterns?

Answer 23

Fear of falling leads to slower walking, avoidance of activities, and higher anxiety and depression.

Question 24

Why might older adults deliberately walk slower?

Answer 24

As a compensatory strategy to ensure safe gait and prevent falls.

Question 25

How is a “fall” defined in this context?

Answer 25

Unintended contact with a supporting surface or inability to recover stability independently.

Question 26

What are common extrinsic factors contributing to falls?

Answer 26

Environmental hazards such as clutter, slippery surfaces, or uneven flooring.

Question 27

What are common intrinsic factors contributing to falls?

Answer 27

Physiological, musculoskeletal, and psychosocial changes, including fear of falling.

Question 28

Where do unintentional fall-related injuries rank as a cause of death in older adults?

Answer 28

They are the seventh leading cause of death in the elderly.