Effects of simulated weightlessness on skeletal muscle structure and function in the upper arm

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dc.contributor.advisor Costill, David L. en_US
dc.contributor.author Parcell, Allen C. en_US
dc.date.accessioned 2011-06-03T19:29:45Z
dc.date.available 2011-06-03T19:29:45Z
dc.date.created 1998 en_US
dc.date.issued 1998
dc.identifier LD2489.Z68 1998 .P37 en_US
dc.identifier.uri http://cardinalscholar.bsu.edu/handle/handle/179391
dc.description.abstract This investigation examined the effects of 4 weeks of non-dominant arm suspension on the functional and structural characteristics of the triceps brachii muscle of 6 normo-active college age males (age: 23.3 ±0.8 yrs, height: 176.1 ±3.7 cm, weight: 75.9 ±5.8 kg). The primary intent of this study was to determine if arm suspension is an effective analogue for simulating the effects of weightlessness on human skeletal muscle. Subjects were tested 2-3 days preceding suspension in a standard arm sling and immediately following removal of the sling. To suspend the arm the sling was worn during waking hours. Subjects were allowed to remove the sling during sleep and bathing. Specific instructions were given to avoid use of the arm. Torque production (Nm) during maximal isometric extensions at 90° significantly declined (p<0.05) in response to arm suspension (53.93 ±5.07 to 47.90 ±5.92; 12%). There was no significant change (p>0.05) in the force-velocity attributes of the triceps over the other measured velocities (60, 90, 120, 180, 240, 300°/sec). Cross-sectional muscle area (CSA) of the upper arm diminished significantly (44.26 +2.66 to 42.43 ±2.54 cm2; 4%) following the 4 weeks of unloading (p<0.05). Histochemical analysis of individual muscle fibers demonstrated reductions in fiber CSA of 27 and 18% for type I and type II fibers, respectively, however these changes were not statistically significant (p>0.05). Amplitude of the IEMG signal during maximal isometric contraction of the long head of the triceps fell (p<0.05) by 21 in response to the 4 week suspension period. The changes in triceps muscle structure and function found with arm suspension are similar in magnitude and direction to data obtained from humans following exposure to real and simulated weightlessness. These findings suggest that arm suspension may provide a useful model for simulating the effects of microgravity on human skeletal muscle. en_US
dc.description.sponsorship School of Physical Education
dc.format.extent vi, 76 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Hypokinesia. en_US
dc.subject.lcsh Weightlessness. en_US
dc.subject.lcsh Arm -- Muscles. en_US
dc.title Effects of simulated weightlessness on skeletal muscle structure and function in the upper arm en_US
dc.description.degree Thesis (Ph. D.) en_US
dc.identifier.cardcat-url http://liblink.bsu.edu/catkey/1115718 en_US

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  • Doctoral Dissertations [3210]
    Doctoral dissertations submitted to the Graduate School by Ball State University doctoral candidates in partial fulfillment of degree requirements.

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