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Exercise physiology and Exercise testing. Mitochondrial DNA and Maximun Oxygen Consumption. Index. Introduction about this article General information 1º investigation 2º investigation 3º investigation 4º investigation Author’s opinion Final conclusion.

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Presentation Transcript
slide1

Exercise physiology and Exercise testing

Mitochondrial DNA and

Maximun Oxygen Consumption

slide2

Index

  • Introduction about this article
  • General information
  • 1º investigation
  • 2º investigation
  • 3º investigation
  • 4º investigation
  • Author’s opinion
  • Final conclusion
slide3

Introduction about this article

  • This article is about relationship
  • between mitochondrial DNA
  • and maximum oxygen consumption.
  • 2. There are four different investigations.
  • 3. The early researchers addressing
  • the contribution of inheritance.
slide4

General information

DNA: Deoxyribonucleic acid (DNA) is

a nucleic acid that contains the genetic

instructions used in the development

and functioning of all known

living organisms and some viruses.

The main role of DNA molecules

is the long-term storage of information

Different individual have different DNA sequence.

Morphs may account for some of the

differences including VO2 max.

slide5

General information

Dna mitochondrial: (mtDNA)

is the DNA located in

organelles called mitochondria.

  • Determinants of Maximal Oxygen Consumption:
  • Cardiac output
  • The oxygen carrying capacity of the blood
  • The amount of exercising skeletal
  • muscle and the ability of muscle to utilize supplied oxygen
slide6

1º investigation

Authors: Dionne et al.

Aim: Association between mitochondrial

DNA sequences and aerobic performance.

Also they assessed the relationship of baseline

VO2 max and the response to training.

Process: Endurance-training program

during 20 week.

Subject: 46 North Americans who

were sedentary.

Results: The subjects had a morph in the gene

encoding Subunit 5 of

NADH dehydrogenase.

Conclusion: Relationship to the training

responses of VO2 max.

slide7

2º investigation

Authors: Rivera and colleagues

Aim: Measure the frequency of each of the

three morph identified within

the NADH dehydrogenase and of one morph of the D-loop.

Subject: 125 elite endurance athletes and 65 sedentary.

Results: Don’t found difference in the

frequency of these morph between groups

slide8

3º investigation

Authors:Chen et al, Ma et al.

Aim:A researches focused on the D-loop,

which contains factors that the

modulate mithocondrial DNA replications and transcription.

Subject:A sample of 120 Chinese subjects: 67 elite endurance

athletes, 33 general endurance athletes, and 20 sedentary.

Results: There were nine morphs, and their frequencies

were significantly different between three groups.

Conclusions: This apparent association between mithocondrial

DNA D-loop polymorphism and endurance capacity needs

confirmation. The authors suggested that a better relationship

might exist between the mithocondrial DNA morphs

endurance performance rather than VO2max.

slide9

4º investigation

Authors: Melton et al.

Aim: Relationship between mitochondrial DNA D-loop

morphs and VO2max.

Subjects: 40 well-trained Australian male endurance cyclists.

Results: There wasn’t association between VO2max and

the D-loop morphs in this population of athletes.

slide10

Author’s opinion

The autors are in agreement with reports of

Dionne et al. (1991) and Rivera et al. (1998),

who found no significant relationship

between D-loop morphs and either sedentary

VO2max or elite endurance athlete status.

The discrepancy between these findings

and those of Chen et al. (2000) and Ma et al. (2000)

may be related to the ethnic differences

between the subjects and the small sample sizes do

not allow firm conclusions about the presence

or absence of small effects.

slide11

Final conclusion

There is evidence that V02max in athletes is

limited by the ability to deliver oxygen to the

muscles, rather than the ability of muscles.

However, mithocondrial function

could still be closely related to the

trainability of VO2max in previously

sedentary population and sub-VO2maximal

endurance performance in athletes.

slide12

JOSE MIGUEL PERUJO FRIAS

PEDRO ALONSO TEJERO SANTANA

THANK’S FOR YOUR ATTENTION

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