24. Muscle Fibre Type Recruitment

Which type of muscle fibre is primarily recruited during low-intensity, long-duration activities such as walking or cycling for several miles?

• Type IIa fibres

• Type I fibres

• Type IIx fibres

• Fast glycolytic fibres

During a 100-metre sprint, which muscle fibre type is predominantly recruited?

• Type I fibres

• Slow oxidative fibres

• Type IIa fibres

• Type IIx fibres

What is the main characteristic of Type I muscle fibres?

• High force production, fatigue quickly

• Low force production, fatigue resistant

• High force production, fatigue resistant

• Low force production, fatigue quickly

Which muscle fibre type is best suited for activities requiring explosive power, such as jumping or lifting a 50 kg weight?

• Type I fibres

• Type IIa fibres

• Type IIx fibres

• Slow oxidative fibres

As exercise intensity increases, which order best describes the recruitment of muscle fibre types?

• Type IIx → Type IIa → Type I

• Type I → Type IIa → Type IIx

• Type IIa → Type I → Type IIx

• Type I → Type IIx → Type IIa

Which of the following activities would primarily recruit Type IIa muscle fibres?

• Jogging at a steady pace for 3 miles

• Sprinting 100 metres

• Running a 400-metre race at near maximum effort

• Walking up a gentle hill

How many muscle fibre types are there?

(a)  

Which muscle fibre type is most resistant to fatigue?

• Type IIx fibres

• Type IIa fibres

• Type I fibres

• Fast glycolytic fibres

During a maximal effort lift of 100 kg, which muscle fibre type is most likely to be recruited?

• Type I fibres

• Type IIa fibres

• Slow oxidative fibres

• Type IIx fibres

Which of the following best describes the recruitment of muscle fibres as exercise intensity increases?

• All fibre types are recruited equally at all intensities

• Slow-twitch fibres are recruited first, followed by fast-twitch fibres as intensity increases

• Fast-twitch fibres are recruited first, followed by slow-twitch fibres

• Only fast-twitch fibres are recruited at any intensity