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Title: Energy metabolism in human slow and fast twitch fibers during prolonged cycle exercise: A Summery
Description: A summary of an article explaining energy metabolism in human slow and fast twitch fibers during prolonged cycle exercise. Suitable for anyone interested in the topic.
Description: A summary of an article explaining energy metabolism in human slow and fast twitch fibers during prolonged cycle exercise. Suitable for anyone interested in the topic.
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Gemma Bridge
HHP
Week 2
Energy metabolism in human slow and fast twitch fibers during prolonged cycle exercise: A Summery
The effects of prolonged exercise on energy metabolism in type I (slow twitch oxidative muscle fibers)
and type II (fast twitch muscle fibers) was investigated in this paper
...
In terms
of these differences it was expected that type II fibers would display a more anaerobic-based energy
metabolism with glycogen serving as a more emphasized fuel source compared to type I fibers which
were expected to display a more aerobic energy metabolism
...
The effects of prolonged exercise were specifically investigated in the vastus lateralis muscle which is
located in the quadriceps as shown in figure 1
...
The 6 male subjects were all approximately 20 years of age, and
in order to assess the effects of prolonged exercise the subjects performed one-legged cycling at 61 %
of their individual maximum 02 consumption (V02 max, which was determined with one leg prior to
testing) until fatigue or for a maximum of 2 hours
...
Location of the vastus lateralis muscle
...
Type II fibers had a higher (P < 0 05) lactate concentration than type I fibers
at 15 min (43 9+9 7 and 512 +9 8 mmol (kg dry wt)-') and at 60 min (18-2+4-7 and 25-9 + 65 mmol (kg
dry wt)-1)
...
Despite these differences,
there were no significant changes in ATP and creatine phosphate (CrP) in either fiber type with
exercise
...
The investigators suggested that the
cause of the difference is probably due to the unique energy metabolic characteristics of each fiber
type and to the way that they are used during the exercise
...
It was suggested, that
based on the histochemically determined glycogen depletion data, that the higher lactate
concentration in type II fibers was due to a greater anaerobic metabolism, whereas the greater
glycogen loss found in type I fibers reflected the larger involvement of this motor unit type in the
exercise activity
...
This suggests that there are protective
mechanisms that prevent an energy crisis
...
Words: 650
Ball-Burnett
...
H and Houston
...
Energy metabolism in human slow and fast twitch fibers
during prolonged cycle exercise
...
1991
Title: Energy metabolism in human slow and fast twitch fibers during prolonged cycle exercise: A Summery
Description: A summary of an article explaining energy metabolism in human slow and fast twitch fibers during prolonged cycle exercise. Suitable for anyone interested in the topic.
Description: A summary of an article explaining energy metabolism in human slow and fast twitch fibers during prolonged cycle exercise. Suitable for anyone interested in the topic.