A six week modified sprint interval training program incorporating extended exercise bouts does not increase maximal cardiac output

Author

Alan R. Smith, The University of Western OntarioFollow

Degree

Master of Science

Program

Kinesiology

Supervisor

Dr. Peter W.R. Lemon

Abstract

Sprint interval training (SIT) improves maximal oxygen uptake (V̇O_2max) and exercise performance but not maximal cardiac output (Q̇_max). The brevity of typical SIT bouts (30-seconds) might hinder improvements in Q̇_max. The purpose of this study was to determine whether extended duration SIT (up to 45 second bouts) improves Q̇_max. Pre-/Post-SIT (or control) V̇O_2max, Q̇_max, maximum stroke volume (SV_max), maximum heart rate, arterial-mixed venous oxygen difference, and 5-minute run distance were measured. SIT progressed from 4x30s to 7x45s “all-out” efforts (4 min recovery) over 6 wk (3x/wk) on a manually driven treadmill. Following SIT, V̇O_2max improved (pre-=3.6±0.8 vs post=3.8±0.8 L·min^-1; p=0.012). Increases in Q̇_max (pre-= 26.13±5.09 vs post=27.10±4.82 L·min^-1; p=0.166) and SV_max (pre-= 138±27 vs post=144±28 mL·beat^-1; p=0.095) were not significant. These data suggest 6 wk of extended SIT bouts (up to 45 s) does not increase Q̇_max significantly and the observed increase in V̇O_2max was due primarily to non-significant improvements in Q̇_max and SV_max.

Recommended Citation

Smith, Alan R., "A six week modified sprint interval training program incorporating extended exercise bouts does not increase maximal cardiac output" (2013). Electronic Thesis and Dissertation Repository. 1707.
https://ir.lib.uwo.ca/etd/1707