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Exercise and Environment > Muscle Heterogeneity and Performance > Flashcards

Muscle Heterogeneity and Performance Flashcards

1
Q

Explain slow, fast and fastest twitch fibres in terms of…

Twitch properties

A

ST
FT (a)
FT(b)

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2
Q

Explain slow, fast and fastest twitch fibres in terms of…

Twitch properties

A

ST
FT (a)
FT(b)

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3
Q

Explain slow, fast and fastest twitch fibres in terms of…

Twitch and fatigue

A

Slow fatigue resistant
Fast fatigue resistant
Fast fatiguable

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4
Q

Explain slow, fast and fastest twitch fibres in terms of…

Colour

A

Red
White
White

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5
Q

Explain slow, fast and fastest twitch fibres in terms of…

Twitch and metabolism

A

SO
FO
FG

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6
Q

Explain slow, fast and fastest twitch fibres in terms of…

Histochem (ATPase)

A

Type I
Type IIa
Type IIb

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7
Q

Explain slow, fast and fastest twitch fibres in terms of…

Myosin heavy chain

A

MHC I
MHC 2A
MHC 2X

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8
Q

Explain slow, fast and fastest twitch fibres in terms of…

Motor unit recruitment

A

SO>FO>FG but FG propagate faster as they have a larger diameter so may contract first.

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9
Q

What are the effects of ageing on muscle fibre type?

A

loss of MHCII isoforms
same speed vs fast myosin as an old person
Selective atrophy or hypertrophy alters the relative expression of fast and slow myosin as a whole muscle

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10
Q

Explain slow, fast and fastest twitch fibres in terms of…

Twitch and fatigue

A

Slow fatigue resistant
Fast fatigue resistant
Fast fatiguable

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11
Q

Explain slow, fast and fastest twitch fibres in terms of…

Colour

A

Red
White
White

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12
Q

Explain slow, fast and fastest twitch fibres in terms of…

Twitch and metabolism

A

SO
FO
FG

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13
Q

Explain slow, fast and fastest twitch fibres in terms of…

Histochem (ATPase)

A

Type I
Type IIa
Type IIb

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14
Q

Explain slow, fast and fastest twitch fibres in terms of…

Myosin heavy chain

A

MHC I
MHC 2A
MHC 2X

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15
Q

Explain slow, fast and fastest twitch fibres in terms of…

Motor unit recruitment

A

SO>FO>FG but FG propagate faster as they have a larger diameter so may contract first.

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16
Q

What are the effects of ageing on muscle fibre type?

A

loss of MHCII isoforms
same speed vs fast myosin as an old person
Selective atrophy or hypertrophy alters the relative expression of fast and slow myosin as a whole muscle

Exercise and Environment (15 decks)

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