Methods of gait analysis

12 important questions on Methods of gait analysis

What are a few disadvantages of visual gait analysis?

Transitory
Eye cannot observe high speeds
Observe movements not forces

How is stride length calculated from cycle time and cadence?

=speed(m/s)x cycle time(s)

=(speed(m/s)x2x60)/Cadence(steps/min)

Which methods are used for automatic measurements of temporal and spatial parameters during gait?

Footswitches
Instrumented walkways
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What is the best way to get accurate data?

Combining video analysis with accelerometers

What are the seven limitations to visual gait analysis?

  1. It is transitory, giving no permanent record
  2. The eye cannot observe high-speed events
  3. It is only possible to observe movements, not forces
  4. It depends entirely on the skill of the individual observer
  5. It is subjective and it can be difficult to avoid assessor bias if the patient is undergoing treatment
  6. Subjects may act differently when they know they are being watched
  7. A clinic or laboratory environment may be very different from the real world

What limitations does examining video recordings overcome?

  • Lack of permanent record
  • The difficulty of observing high-speed events

What are the four advantages to examination by video recording?

  1. It reduces the number of walks a subject needs to do
  2. It makes it possible to show the subject exactly how they are walking
  3. It makes it easier to teach visual gait analysis to someone else
  4. It completes the picture in a gait report as seeing the patient is very meaningful while reading the values of their analysis.

How is PCI calculated?

PCI =  (heart rate walking - heart rate resting)/speed

What is the physiological cost index (PCI) used for?

The physiological cost index (PCI) is used to account for individual differences in energy consumption during physical activity.

Why is estimating energy expenditure using mechanical calculations generally unsatisfactory for complex activities like walking?

Because metabolic energy expenditure does not result in an equivalent amount of mechanical work. Energy is used to absorb mechanical energy in eccentric muscular activity, and the efficiency of conversion during muscular contraction for positive work is low and variable.

What is the "estimated external work of walking" (EEWW) used for?

The "estimated external work of walking" (EEWW) is used in some laboratories as a way to estimate energy expenditure using mechanical calculations. It is more reliable for activities with a simple relationship between muscular contraction and mechanical output, such as the concentric contraction of a single muscle

What is the purpose of measuring oxygen consumption and carbon dioxide production?

The purpose of measuring oxygen consumption and carbon dioxide production is to calculate the amount of oxygen consumed in a given time and determine the type of metabolism (aerobic or anaerobic) taking place.

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