Effects of Resistance Training on H+ Regulation, Buffer Capacity, and Repeated Sprints


Medicine & Science in Sports & Exercise: November 2006 - Volume 38 - Issue 11 - pp 2004-2011
doi: 10.1249/01.mss.0000233793.31659.a3
APPLIED SCIENCES: Physical Fitness and Performance

Purpose: We investigated the effects of resistance training on muscle buffer capacity, H+ regulation, and repeated-sprint ability (RSA).

Methods: Sixteen recreationally active females performed a graded exercise test to determine V˙O2peak and the lactate threshold (LT), a repeated-sprint test (5 × 6 s, every 30 s) to determine RSA, and a 60-s high-intensity exercise test based on their pretraining RSA score (CIT60; continuous cycling at approximately 160% V˙O2peak). Muscle biopsies (vastus lateralis) were sampled before and immediately after CIT60. Subjects were then randomly assigned to either a high-repetition (three to five sets of 15-20 reps) short-rest (20 s) resistance-training group or to a control group.

Results: Training did not result in significant improvements in V˙O2peak (P > 0.05) but did improve the LT, leg strength, and RSA (P < 0.05). There were no significant improvements in muscle buffer capacity after training (P > 0.05); however, there was a significant reduction in H+ in the muscle and blood after high-intensity exercise (CIT60) (P < 0.05),

Conclusions: High-repetition, short-rest, resistance training does not improve muscle buffer capacity in active females, but it does reduce H+ accumulation during high-intensity exercise (~160% V˙O2peak). It is likely that increases in strength, LT, and ion regulation contributed to the improved RSA.

School of Human Movement and Exercise Science, The University of Western Australia, Perth, AUSTRALIA

Address for correspondence: David Bishop, Team-Sport Research Group, School of Human Movement and Exercise Science, The University of Western Australia, Perth, Australia; E-mail: dbishop@cyllene.uwa.edu.au.

Submitted for publication December 2005.

Accepted for publication May 2006.

©2006The American College of Sports Medicine