Doma, Kenji, and Deakin, Glen (2015) The acute effect of concurrent training on running performance over 6 days. Research Quarterly for Exercise and Sport, 86 (4). 387- 396.

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Abstract

Purpose: This study examined the effects of strength training on alternating-days and endurance training on consecutive-days on running performance over 6 days.

Methods: Sixteen male and eight female moderately trained individuals were evenly assigned into concurrent (CCT) and strength (ST) training groups. The CCT group undertook strength training on alternating days combined with endurance training on consecutive days over 6 days. One week later, the CCT group conducted 3 consecutive days of endurance training only to determine whether fatigue would be induced with endurance training alone (CCT-Con). Endurance training was undertaken to induce endurance training stimulus and to measure cost of running (CR), rating of perceived exertion (RPE) and time to exhaustion (TTE). The ST group undertook three strength training sessions on alternating days. Maximal voluntary contraction (MVC) and rating of muscle –soreness (RMS) and –fatigue (RMF) were collected prior to each strength and endurance session.

Results: For the CCT group, small differences were primarily found in CR and RPE (ES = 0.17-0.41). However, moderate-large reductions were shown for TTE and MVC (ES = 0.65-2.00) whereas large increases in RMS and RMF (ES = 1.23-2.49) were found prior to each strength and endurance training session. Small differences were found in MVC for the ST group (ES = 0.11) and during CCT-Con for the CCT group (ES = 0.15-0.31).

Conclusion: Combining strength training on alternating days with endurance training on consecutive days impairs MVC and running performance at maximal effort and increase ratings of muscle soreness and fatigue over 6 days.

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