Hyperthyroidism increases metabolic rate, mitochondrial ATP production, and protein synthesis, but it remains to be determined whether all tissues and synthesis of specific protein pools are equally affected by hyperthyroidism. Previous studies showed that mitochondrial function was less responsive to elevated triiodothyronine (T(3)) levels in the low-oxidative plantaris muscle compared with ot...

Heat shock protein 72 (Hsp70) is constitutively expressed in rat hindlimb muscles, reportedly in proportion to their content of type I myosin heavy chain. This distribution pattern has been suggested to result from the higher recruitment and activity of such muscles and/or a specific relationship between myosin phenotype and Hsp70 content. To differentiate between these possibilities, the fiber...

FAULKNER, JOHN A., LEO C.MAXWELL, AND DAVID A. LIEBERMAN. Histochemical characteristics of muscle Jibers from trained and detrained guinea pigs. Am. J. Physiol. 222(4) : 836-840. 1972.~Sixweek-old guinea pigs have nearly 12,000 fibers per plantaris cross section. With aging, some 2,700 fibers were lost. Daily endurance running prevented the loss of fibers and fibers were smaller. Trained animal...

Giger, Julia M., Fadia Haddad, Anqi X. Qin, and Kenneth M. Baldwin. Functional overload increases -MHC promoter activity in rodent fast muscle via the proximal MCAT ( e3) site. Am J Physiol Cell Physiol 282: C518–C527, 2002. First published October 24, 2001; 10.1152/ ajpcell.00444.2001.—Functional overload (OL) of the rat plantaris muscle by the removal of synergistic muscles induces a shift in...

BACKGROUND Currently, several graft options have been described for reconstruction of the medial ulnar collateral ligament of the elbow. Palmaris longus, gracilis, plantaris, toe extensor, and even Achilles tendon autografts have been well documented. To our knowledge, no study has investigated the clinical outcomes following the use of allograft tendon for primary medial ulnar collateral ligam...

Triceps surae muscles are mechanically connected by the shared Achilles tendon and by epimuscular myofascial connections. We aimed to assess the effects of proximal lengthening of gastrocnemius and plantaris muscles, imposed by changes in knee angle, on the magnitude and direction of the 3D ankle moment exerted by the soleus muscle and the mechanical interaction between ankle plantar flexor mus...

BACKGROUND The orthopaedic literature contains relatively little quantitative information regarding the anatomy of the posterior aspect of the knee. The purpose of the present study was to provide a detailed description of, and to propose a standard nomenclature for, the anatomy of the posterior aspect of the knee. METHODS Detailed dissection of twenty nonpaired, fresh-frozen knees was perfor...

To clarify the role of gravity in the postnatal development of skeletal muscle, we exposed neonatal rats at 7 days of age to microgravity. After 16 days of spaceflight, tibialis anterior, plantaris, medial gastrocnemius, and soleus muscles were removed from the hindlimb musculature and examined for the expression of MyoD-family transcription factors such as MyoD, myogenin, and MRF4. For this pu...