Date of Award

Spring 8-1-2003

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Athletic Training

First Advisor

Mitchell L. Cordova

Second Advisor

Jody B. Brucker

Third Advisor

Timothy J. Demchak

Abstract

Context: The ability for cryotherapy to influence subcutaneous temperature has mainly been considered during resting skeletal muscle. However, most injuries occur when subcutaneous temperatures have been physically active. Objective: The purpose of this study was to evaluate the effect of ice on exercised rectus femoris musculature and the effect of exercise on cooling rectus femoris musculature to 1 0°C below resting temperature. Design and Setting: Two 2 x 2 repeated measures designs were used. The study was conducted in the Sports Injury Research Laboratory at Indiana State University. Subjects: Six (age= 26.0 ± 3.2 yrs, ht = 181.6 ± 2.4cm, mass= 92.9 ± 9.1kg, skinfold 25.4 ± 2.7) healthy, physically active individuals participated in this study. Measurements: We evaluated the effects of ice to get back to resting temperature post exercise and whether exercise and depth had an affect on the time to cool rectus femoris muscle 10°C below resting temperature. Results: There was no exercise by depth interaction on the time to resting temperature (Ft,s=44.7, P=0.001). However, it took longer to cool the exercised rectus femoris musculature at 2cm deep (54.1 ± 8.23min) then at lcm deep (40.8 ± 4.42min; P=0.001). Additionally, both depths cooled faster (P<0.001) when ice was applied (lcm=5.7 ± 2.31min, 2cm=6.8 ± 2.19min; P=0.38). An exercise by depth interaction for cooling time to 1 0°C below resting temperature was not revealed (F 1,5=0.1 0, P=O. 77). However, tissues at 1 em depth cooled quicker than the 2 em depth (P<0.05). Additionally, the no exercise with ice group cooled considerably slower than the exercise followed by ice group. Conclusions: When considering skeletal muscle in an injurious state, this result can certainly extend the course and, ultimately, the magnitude of secondary tissue injury. However, it is not clear how injury affects local tissue temperature. Lastly, when applying an ice bag to non-injured exercised skeletal muscle, the treatment duration does not need to be as long as when cooling skeletal muscle at rest.

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