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Steady State Skeletal Muscle Temperature during Moderate Intensity Single Leg Dynamic Knee Extension Exercise
Author(s) -
Mangum Joshua Earl,
Luttrell Meredith,
Ely Matthew,
Abdala Pedro,
Sieck Dylan,
Halliwill John
Publication year - 2016
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.30.1_supplement.1243.6
Subject(s) - skeletal muscle , medicine , chemistry , anatomy
In resting skeletal muscle, there is a temperature gradient with deeper tissue typically having higher temperatures than more superficial tissue. During exercise, skeletal muscle temperature increases with the rise in metabolism. Our lab has previously used a model of dynamic knee extension exercise which consists of single‐leg kicking for 60 minutes at 60% of peak power output. The rate of skeletal muscle temperature rise, maximal temperature attained, and range of intramuscular temperatures with this mode of exercise is unknown. Therefore, the purpose of this study was to examine the changes in skeletal muscle temperature at three different depths during exercise using this model. It was hypothesized that the three depths within skeletal muscle would have different temperatures at rest, and these would rapidly increase, converging at some point during exercise. Five young (ages 21–38) healthy male subjects completed the exercise protocol and intramuscular temperature was measured via a percutaneous intramuscular thermocouple that measured temperature at three different depths within the vastus lateralis. Individual temperatures from each depth were measured and also averaged to express a mean intramuscular temperature. Within 10 minutes of exercise, mean intramuscular temperature increased from 34.59 ± 0.44°C to 37.06 ± 0.10°C (mean ± SE, p < 0.01). By 30 minutes, mean intramuscular temperature reached a plateau of 39.15 ± 0.11°C. The variability of temperature in muscle, expressed as the range of the three different intramuscular temperatures, decreased from 1.40 ± 0.39°C to 0.60 ± 0.21°C by 30 minutes (p = 0.08), and did not further decrease to the end of exercise. These data suggest that skeletal muscle temperature increases rapidly during exercise, and the heterogeneity in temperatures typically associated with depth is reduced. As well, these data suggest that there is a steady intramuscular temperature reached within 30 minutes of steady state exercise at 60% of peak power output. Support or Funding Information Support provided by NIH grant HL115027