Delayed onset muscle soreness after inspiratory threshold loading in healthy adults.
OBJECTIVE
Skeletal muscle damage occurs following high-intensity or unaccustomed exercise; however, it is difficult to monitor damage to the respiratory muscles, particularly in humans. The aim of this study was to use clinical measures to investigate the presence of skeletal muscle damage in the inspiratory muscles.


METHODS
Ten healthy subjects underwent 60 minutes of voluntary inspiratory threshold loading (ITL) at 70% of maximal inspiratory pressure. Maximal inspiratory and expiratory mouth pressures, delayed onset muscle soreness on a visual analogue scale and plasma creatine kinase were measured prior to ITL, and at repeated time points after ITL (4, 24 and 48 hours post-ITL).


RESULTS
Delayed onset muscle soreness was present in all subjects 24 hours following ITL (intensity = 22 +/- 6 mm; significantly higher than baseline p = 0.02). Muscle soreness was reported primarily in the anterior neck region, and was correlated to the amount of work done by the inspiratory muscles during ITL (r = 0.72, p = 0.02). However, no significant change was observed in maximal inspiratory or expiratory pressures or creatine kinase.


CONCLUSIONS
These findings suggest that an intense bout of ITL results in muscle soreness primarily in the accessory muscles of inspiration, however, may be insufficient to cause significant muscle damage in healthy adults.
Mathur
Sunita
S
Dept of Physical Therapy, University of Toronto, Toronto ON, Canada.
Sheel
A William
AW
Road
Jeremy D
JD
Reid
W Darlene
WD
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