slow-twitch fibers

One of the two main types of skeletal muscle, which contains abundant mitochondria and myoglobin. Red muscle fibres contract and fatigue more slowly than white fibres and generate ATP by aerobic catabolism of glucose and fats, utilizing myoglobin-bound O2

slow-twitch fi·bers

(slō-twich fī'bĕrz)
Histologically distinct skeletal muscle fibers that generate energy predominantly through the aerobic energy transfer system; are selectively recruited in aerobic activities.
Synonym(s): slow-oxidative (SO) fibers, Type I fibers.
References in periodicals archive ?
Endurance of the muscle is determined by slow-twitch fibers and while power is determined by fast-twitch fibers.
However, the soleus is comprised primarily of slow-twitch fibers (80 to 100%), which have lower hypertrophic potential in comparison to type II fibers (50).
Although the mechanisms underlying such differences between fast- and slow-twitch fibers are unclear, one potential explanation is that the different expression pattern of NOS isoforms between fiber types is associated with the different results of metabolic changes following L-NAME treatment.
PRT specifically works to strengthen both fast-twitch and slow-twitch fibers in muscles, says Wilson.
It's great that you are creating a better balance by focusing on the slow-twitch fibers that increase your aerobic capacity.
What's the difference between light meat and dark meat, or slow-twitch fibers and fast-twitch fibers?
This finding was particularly interesting because it is exactly opposite of what would be expected from conventional fiber type-based explanations of EMG frequency, where fast-twitch fibers would have higher frequency EMG spectra than slow-twitch fibers.
This would have resulted in an increase in the number of type I slow-twitch fibers at the expense of type II fast-twitch fibers.
Slow-twitch fibers (also called "Type 1 muscle fibers") activate and deactivate slowly, but when activated they are also very slow to fatigue.
Cross-sectional area of fast-twitch fibers was almost twice the size of slow-twitch fibers (6,721 and 3,713 ^m2, respectively).
Although fast-twitch muscle fibers are usually larger in size than slow-twitch, slow-twitch fibers can become up to 22% larger than fast-twitch fibers with effective endurance training.