Solo or group sessions for the best training outcomes?

What they found

After all the data was analyzed, some very interesting results emerged. When it came to performance, there were no differences between the groups. Unsurprisingly, both groups trended toward running slower with subsequent repetitions. This effect appears to be more emphasized in the individual repetitions, although it was not significantly different. When it comes to performance therefore, it appears that there’s no difference between running individually and collectively.

However, when it comes to the blood lactate values, the results were much more interesting. For both groups, each repetition led to higher and higher post run lactate values (to be expected). What was not expected however was that the lactate values were significantly lower after each repetition while running collectively versus individually (see figure 1). Remember, the runners were running at the same speed!

Figure 1: Blood lactate in individual vs. group settings

For rating of perceived exertion, the same pattern was seen. RPE climbed after each repetition in both groups. However, it was lower at every step in the runs that were performed collectively. Not only was the physiological cost of the running reps lower during group training, the subjects also felt like the runs were easier and they weren’t exerting as much effort. The physiological differences were manifested in psychological differences.

Perhaps most interesting of all was the finding related to core affect- valance. While both groups began the workout with a positive valence, the collective group had a significantly more positive affect. And that affect stayed positive throughout the whole session, with the athletes ending the session still feeling positive. In contrast, when the runs were performed individually, affect quickly became negative and the session ended that way. Again, the presence of others impacted the outcomes of the sessions, this time with the athletes’ emotional state differing.

Practical applications for athletes

All in all, this is fascinating stuff. During the same workout performed at the same level of performance, the physiological, psychological, and emotional impact of that workout is dramatically altered simply by running without or without a group. Just the presence of other human beings is capable of divorcing the relationship between internal load and external load! And since training is often performed in both group and individual settings, it’s important to understand the varied impact of these training settings. A simple change can have a major impact on what athletes experience, even if the performance is exactly the same.

For athletes who train both collectively and individually, these results may not be particularly surprising, but they are very compelling. A simple change to running with others can dramatically change the physiological and psychological impact of a given workout, even when the workout is performed at the same absolute intensity. When it comes to long-term development, both the benefit of the workout and the cost of the workout are relevant. If something as simple as training with a group can reduce the overall ‘cost’ of the workout, that can mean better progress over time. And if athletes perceive workouts to be a more positive experience, they’re likely to want to repeat those workouts. Consistency matters!

Therefore, if you have the ability to do so, plan more of your intense workouts with a training group to ensure that you can create as much external load as possible for a given internal load. In other words, take advantage of the group dynamic to perform at the same level for less physiological cost. As the quality of your workouts are directly related to the performances you achieve later on, stacking quality workouts over time is going to be easier to do if they are less stressful. Every small advantage adds up. And just as importantly, as demonstrated by the results, you’ll enjoy the experience more!

If you’re unable to train with a group for every training session, aim to perform solo during workouts where the demand is less, and the focus is purely on the internal load. Typically, these lower intensity sessions are easier to manage physiologically and psychologically. Of course, if you have access to a training group, take advantage of it!

You may be wondering if these results applicable to other sports and other modes of training? While there is no direct evidence that’s the case, there’s no reason to expect it would be any different. Group dynamics are group dynamics and training is training. There is nothing particularly special about running in this context. Regardless of your sport, I’m sure you’ve noticed or felt these effects, even if you couldn’t ‘prove’ it or quantify it. As a coach myself, I’ve certainly noticed that swimmers often struggle when they have to perform workouts by themselves. If you participate in sports other than running, it’s safe to assume these concepts will apply to you and your training.

Reference

1. Eur J Sport Sci. 2019 Sep;19(8):1045-1052.  doi: 10.1080/17461391.2019.1593510. Epub 2019 Mar 28