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Representative tracings of MSNA under normothermia and heat stress conditions (A), the MSNA response to a fatiguing handgrip (B) during a separate visit in one CHF patient. The patients were not heated during the visit for the handgrip exercise. Fatiguing handgrip exercise evoked significant MSNA increase in the CHF patients (C; n = 5). HG denotes last minute of the handgrip exercise.
