Here are the theories from the study as to why running seems to significantly detracts from strength, power and hypertrophy.
When separating our analysis into concurrent running vs.cycling, we found that strength training concurrently with running, but not with cycling, resulted in signiﬁcant decrements in both hypertrophy and strength. There are at least 2 possible reasons why runners are more susceptible to decrements than those who cycle. The ﬁrst is that cycling is more biomechanically similar to the majority of measures of strength taken in the studies reviewed (compound free weights) (16,19,36). A second possibility concerns skeletal muscle damage. Although we cannot suggest this from our analysis, it could be speculated that different types of contractions inﬂuence the differences seen between running and cycling. Running has a high eccentric component,whereas cycling consists of primarily concentric activity.These differences in contraction types (eccentric vs.concentric) may create greater damage in running than in cycling. For example, long distance running causes large increases in muscle damage, whereas ultradistance cycling (230 km) does not (28). However, future studies need to address contraction types before we can deﬁnitively attribute differences to this potential moderating variable.
- There is a negative correlation between the frequency/duration of endurance training and strength/power - The type of endurance training matters, as running lead to larger decreases in strength/power when compared to cycling - In general, athletes should avoid long bouts of endurance training (greater than 20 min) as well as high frequencies (more than 2x/week) - Concurrent training vs only resistance or only endurance resulted in highest fat loss - Strength/power athletes should focus on high intensity endurance training
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