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Wiens, Lucas

University of British Columbia

Low-load resistance training (LLRT) increases low load absolute local muscle endurance (LME), however, the physiological mechanisms inducing these adaptions are poorly understood. High intensity/sprint interval training (HIIT/SIT) increases muscle capillarization, mitochondrial content and function (hypothesized mechanisms of LME), yet minimal research has investigated the effect of HIIT/SIT on low load absolute LME. LLRT and HIIT/SIT fall the closest to one another on the strength-endurance exercise continuum. Therefore, the largest potential “cross-over” effect may exist for these interventions, whereby HIIT/SIT and/or LLRT may simultaneously increase muscle strength, muscle mass, LME and maximal aerobic fitness. Untrained healthy individuals aged 19-30 were recruited (10 completed). Participants legs were randomized to a LLRT or HIIT/SIT condition over a 10-week period (2-3x/week). An overall effect of time for observed for absolute low load LME, 1-RM knee extension strength, VO2Peak power output and Wingate mean power. An effect size of (0.68, 95%CI: 1.03 – 0.33) and (0.02, 95%CI: -0.69 - 0.64) were observed for the LLRT relative to the HIIT condition for the LME test and the 1-RM knee extension test respectively. A moderate-large effect size (0.79, 95%CI: 0.26 - 1.22) was found in favor of the HIIT/SIT condition relative the LLRT condition for 30 second maximal kicking test mean power post training. A large effect size (0.93, 95%CI: 0.61 - 1.25) for vastus lateralis (VL) thickness and a small-moderate effect size for VO2Peak/thigh lean mass (0.38 95%C: 0 .04 - 0.72) were observed for HIIT/SIT relative to LLRT. LLRT appears to be more effective at improving low load absolute LME while HIIT/SIT likely induces greater gains in muscle mass/size, VO2Peak and anaerobic performance and both interventions similarly improve 1-RM strength.

Text

2024-11-07

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/89620

Kinesiology

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/