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Temperature changes in deep muscles of humans during upper and lower extremity exercise
V J Wirth1, B L Van Lunen, D Mistry
1University of Charleston, Charleston, WV, 25304.
Objective:
To examine the effect of 15 minutes of upper and lower extremity exercise on raising intramuscular temperature in the triceps surae to 39 degrees C to 45 degrees C (the therapeutic range).
Design And Setting:
Intramuscular temperature was measured 5 cm deep in the triceps surae using a 23-gauge thermistor needle microprobe connected to a monitor. Each subject was tested under 3 conditions: 15 minutes of rest, 15 minutes of jogging on a treadmill, and 15 minutes of handpedaling an upper-body ergometer. Exercise bouts were performed at 70% of each subject's maximum heart rate.
Subjects:
Six males, either sedentary or recreational athletes (age = 21.3 +/- 2.9 years; ht = 176.8 +/- 6.0 cm; wt = 72.7 +/- 11.6 kg; resting heart rate = 57.8 +/- 6.74 bpm; target heart rate = 156.5 +/- 3.0 bpm), volunteered to participate in this experiment.
Measurements:
Intramuscular temperature was measured at a depth of 5 cm before and after each test condition.
Results:
Data analyses consisted of analyses of variance with repeated measures and a Tukey post hoc test (P < .05). The results showed a significant temperature increase over baseline after exercise on the treadmill (2.2 degrees C +/- 0.63 degrees C); however, it did not yield temperature increases >/= 39 degrees C. No significant temperature change occurred after exercise on the upper-body ergometer (-0.45 degrees C +/- 0.80 degrees C).
Conclusions:
Active exercise increased intramuscular temperature in working muscles but did not affect intramuscular temperature in nonworking muscles. In addition, 15 minutes of jogging on a treadmill at 70% of maximum heart rate was not sufficient to raise intramuscular temperature to 39 degrees C to 45 degrees C.
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