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The effects of training intensity on muscle buffer capacity in females

Edge, Johann and Bishop, David and Goodman, Carmel (2006) The effects of training intensity on muscle buffer capacity in females. European Journal of Applied Physiology, 96 (1). pp. 97-105. ISSN 1439-6319

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Abstract

We examined changes in muscle buffer capacity (βmin vitro), and the lactate threshold (LT) after 5 weeks of high-intensity interval training (INT) above the LT or moderate-intensity continuous training (CON) just below the LT. Prior to and immediately after training, 16 female subjects performed a graded exercise test to determine and the LT, followed 2 days later by a resting muscle biopsy from the vastus lateralis muscle to determine βmin vitro. Following baseline testing, the subjects were randomly placed into the INT (n=8) or CON training group (n=8). Subjects then performed 5 weeks of cycle training (3 days per week), performing either high-intensity INT (6–10×2 min at 120–140% LT with 1 min rest) or moderate-intensity CON (80–95% LT) training. Total training volume was matched between the two groups. After the training period, both groups had significant improvements in (12–14%; P<0.05) and the LT (7–10%; P<0.05), with no significant differences between groups. The INT group, however, had significantly greater improvements in βmin vitro (25%; 123±5–153±7 μmol H+·g muscle dm−1·pH−1; P<0.05) than the CON group (2%; 130±12–133±7 μmol H+·g muscle dm−1·pH−1, P>0.05). Our results show that when matched for training volume, high-intensity interval training above the LT results in similar improvements in and the LT, but greater improvements in βmin vitro than moderate-intensity continuous training below the LT. This suggests that training intensity is an important determinant of changes to βmin vitro.

Item Type: Article
Additional Information:

Online ISSN: 1439-6327

Uncontrolled Keywords: ResPubID22144. lactate threshold, interval training, training volume, intense exercise, muscle buffer capacity, female athletes, females
Subjects: Faculty/School/Research Centre/Department > Institute of Sport, Exercise and Active Living (ISEAL)
FOR Classification > 1106 Human Movement and Sports Science
Depositing User: VUIR
Date Deposited: 27 Jan 2012 00:15
Last Modified: 12 Feb 2015 00:52
URI: http://vuir.vu.edu.au/id/eprint/8096
DOI: 10.1007/s00421-005-0068-6
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Citations in Scopus: 47 - View on Scopus

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