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Related Concept Videos

Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...

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Related Experiment Video

Updated: Jun 27, 2026

Measurement of Mitochondrial Respiration in Human and Mouse Skeletal Muscle Fibers by High-Resolution Respirometry
08:12

Measurement of Mitochondrial Respiration in Human and Mouse Skeletal Muscle Fibers by High-Resolution Respirometry

Published on: October 4, 2024

Muscle mitochondrial changes with aging and exercise.

Ian R Lanza1, K Sreekumaran Nair

  • 1Division of Endocrinology, Endocrinology Research Unit, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.

The American Journal of Clinical Nutrition
|December 6, 2008
PubMed
Summary
This summary is machine-generated.

Regular endurance exercise can combat age-related declines in mitochondrial function and insulin sensitivity. Adiposity, not just age, significantly impacts insulin sensitivity, suggesting lifestyle factors are key.

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Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
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Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

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Measurement of Mitochondrial Respiration in Human and Mouse Skeletal Muscle Fibers by High-Resolution Respirometry
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Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
12:59

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Area of Science:

  • Exercise physiology
  • Metabolic health
  • Aging research

Background:

  • Aging is associated with reduced mitochondrial function and insulin sensitivity.
  • The roles of chronological age versus lifestyle factors (adiposity, inactivity) in these declines are debated.
  • Exercise is known to benefit mitochondrial function, but its impact on age-related dysfunction is unclear.

Purpose of the Study:

  • To investigate the effects of endurance exercise on age-related mitochondrial dysfunction and insulin resistance.
  • To explore the relationship between mitochondrial function and insulin sensitivity in aging.
  • To determine if adiposity or age is the primary driver of insulin resistance.

Main Methods:

  • Review of existing literature on exercise, aging, mitochondrial function, and insulin sensitivity.
  • Analysis of data from endurance exercise studies across the lifespan.
  • Examination of data comparing mitochondrial function and insulin sensitivity in different populations (e.g., Asian Indians vs. European Americans).

Main Results:

  • Endurance exercise enhances mitochondrial function throughout life, counteracting age-related decline.
  • Adiposity appears to be a more significant factor in age-related insulin resistance than age itself.
  • Insulin stimulates mitochondrial function in healthy individuals but not in type 2 diabetes patients, suggesting insulin resistance may impair mitochondrial function.
  • Mitochondrial function and insulin resistance are not always directly linked, as seen in Asian Indians with high mitochondrial capacity and insulin resistance.

Conclusions:

  • Regular endurance exercise is a viable strategy to delay age-related mitochondrial dysfunction and potentially insulin resistance.
  • Adiposity and physical activity levels are critical determinants of age-related insulin sensitivity.
  • The relationship between mitochondrial function and insulin resistance is complex and influenced by factors beyond chronological age.