Adjustments in the force-frequency relationship during passive and exercise-induced hyperthermia.

Abstract:

INTRODUCTION:We examined the extent to which fatiguing cycling exercise in the heat influences contractile function in modulating the force-frequency relationship. METHODS:Before (∽37.0 °C) and after (∽38.5 °C) exercise (ExH) and passive (PaH) hyperthermia, an 8-s train of stimulation at 10, 20, 50, and 100 Hz (2 s per frequency) and a potentiated twitch were evoked on the relaxed knee extensors using percutaneous stimulation. RESULTS:ExH and PaH produced a decrease in the 20:50 Hz force ratio, indicative of low-frequency fatigue (P < 0.01). This adjustment was more pronounced after ExH than PaH (P < 0.01). A rightward displacement in the force-frequency relationship occurred after ExH and PaH (P < 0.05) and was exacerbated by ExH (P < 0.05). Peak twitch force also decreased after ExH (P < 0.05). CONCLUSIONS:ExH reduces force summation due to development of skeletal muscle fatigue, exacerbating the shift in force-frequency to the right relative to PaH.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Périard JD,Racinais S,Thompson MW

doi

10.1002/mus.24228

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

822-9

issue

5

eissn

0148-639X

issn

1097-4598

journal_volume

50

pub_type

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