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
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
In contrast, the soleus muscle has oxidative fibers predominance and a slow-twitch fibers majority (Table 1).
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).
The fast twitch fibers hydrolyze ATP faster than slow twitch and have greater reactivity in the presence of a basic pH, contrary to acidic pre-incubations in which slow-twitch fibers present a more intensity of reaction (Kalmar et al., 2012; Latorre et al., 1993).
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.
In contrast, dancers who have more lean slow-twitch fibers, which are responsible for endurance, can work for longer periods but often lack tone and require weight-lifting exercises to build muscle mass.
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. It was hypothesized, however, that perhaps the strength-trained athletes had improved the ability to synchronize motor unit firings, which would increase the relative power in the low-frequency portion of the EMG spectrum [8].
Others that contract slowly are known as slow-twitch fibers. Although a motor unit consists of only one kind of fiber type, most muscles have both fast- and slow-twitch fibers.
Muscle fibers are categorized into "slow-twitch fibers" and "fast-twitch fibers" (Squire, McConnell, & Zigmund, 2003).
Cross-sectional area of fast-twitch fibers was almost twice the size of slow-twitch fibers (6,721 and 3,713 ^m2, respectively).