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The effect of high‐intensity priming exercise on indices of aerobic function and exercise tolerance during a subsequent high‐intensity exercise bout
Author(s) -
Ferguson Carrie,
Whipp Brian J,
Cathcart Andrew J,
Rossiter Harry B,
Ward Susan A
Publication year - 2006
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.20.4.a811
Subject(s) - anaerobic exercise , priming (agriculture) , cycle ergometer , medicine , intensity (physics) , physical exercise , exercise physiology , endocrinology , cardiology , exercise intensity , chemistry , heart rate , physical therapy , blood pressure , physics , biology , botany , germination , quantum mechanics
A recent bout of high‐intensity priming exercise has been shown to alter the balance of aerobic and anaerobic energy provision during subsequent exercise above the lactate threshold (LT). However, it remains uncertain whether such “priming” influences the tolerable duration of subsequent exercise through changes in the parameters of the hyperbolic power‐duration (P‐t) relationship (i.e. critical power (CP) and the curvature constant (W’)). Gas exchange was measured breath‐by‐breath (mass spectrometry; turbinometry) during cycle‐ergometer exercise performed to the limit of tolerance in six males. Subjects completed (each on a different day) an incremental test (15W.min −1 ) and 4 constant‐load tests at different work rates to determine CP, W’ and VO 2max . These 5 tests were subsequently repeated, but each preceded by a 6‐min supra‐CP ‘priming’ bout and a 2‐min 20W recovery, by which time VO 2 had decreased to a value appreciably below LT. The hyperbolic form of the P‐t relationship was retained following priming, with no significant difference in CP (242 ± 36 vs. 241 ± 39W) or VO 2max (3.93 ± 0.38 vs. 3.97 ± 0.34 l.min −1 ). In contrast, there was a significant reduction in W’ (16.13 ± 2.33 vs. 10.61 ± 2.07 kJ) and the tolerable duration of the supra‐CP exercise (−33 ± 11%). Therefore, these results suggest that following supra‐CP priming, there is either a reduced depletable energy resource or a residual fatigue‐metabolite level that leads to a fatigue limit before this resource is depleted.