An interesting study attempting to see what schedule of weight training and aerobics was optimal. The basic finding of this study is, doing aerobics and strength on alternate days was most effective as it was most recovery time between them if one is doing a concurrent program which calls for both. That is, if you're regularly training both aerobic and anaerobic systems and trying to make improvements in both, it's best to do them on alternate days vs together or same day. That's how I have always approached it personally. There's many a variable one can throw into these findings that could alter the recs, but it's the first study I'm aware of that's attempted to answer the Q/issue of people doing exercise of "contradictory qualities" together. More people are interested in being a well balanced in their fitness levels, vs just being strong in the gym or able to run marathons, so this is timely study:
J Strength Cond Res. 2014 Dec 24.
The specific training effects of concurrent aerobic and strength exercises depends on recovery duration.
Abstract
This study aimed to determine whether the duration (0h, 6h or 24h) of recovery between strength and aerobic sequences influences the responses to a concurrent training program. Fifty-eight amateur rugby players were randomly assigned to either control (CONT), concurrent training (C-0h, C-6h or C-24h) or strength training (STR) groups during a 7-week training period.
Two sessions of each quality were proposed each week with strength always performed before aerobic training. Neuromuscular and aerobic measurements were performed before and immediately after the overall training period. Data were assessed for practical significance using magnitude-based inference.
Gains in maximal strength for bench press and half squat were lower in C-0h compared to C-6h, C-24h and STR. The maximal voluntary contraction (MVC) during isokinetic knee extension at 60°·s was likely higher for C-24h compared with C-0h. Changes in MVC at 180°·s was likely higher in C-24h and STR than in C-0h and C-6h. Training-induced gains in isometric MVC for C-0h, C-6h, C-24h and STR were unclear. VO2peak increased in C-0h, C-6h and C-24h. Training-induced changes in VO2peak were higher in C-24h than in C-0h and C-6h.
Our study emphasized that the interference on strength development depends on the recovery delay between the two sequences. Daily training without a recovery period between sessions (C-0h) and, to a lesser extent, training twice a day (C-6h), is not optimal for neuromuscular and aerobic improvements.
Fitness coaches should avoid scheduling two contradictory qualities, with less than 6-hours recovery between them to obtain full adaptative responses to concurrent training.
http://www.ncbi.nlm.nih.gov/pubmed/?...overy+duration
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Originally Posted by Vic303
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