Matt888 said:
There are more than a few studies that have proven weight training can improve your cycling performance, of course there are also studies that prove the opposite. Here are a couple for the former.
Hickson et al. (1988), found that 10 weeks of a three-times-a-week strength training did not change the VO2max of moderately-trained runners and cyclists. But a short-term (4-8 minutes) endurance test was improved by 12% for both running and cycling, while long-term endurance improved from 70 to 85 minutes for cycling. Marcinik et al. (1991) showed that strength training had positive effects of endurance cycling capacity. Eighteen males performed 12 weeks of strength training three times a week. The strength training consisted of 8-12 repetitions of upper body exercise (bench press, push-ups, lat pull-downs, arm curls) and 15-20 repetitions on lower body exercises (knee extensions, hip flexion's, parallel squats) with a 30-second rest between exercises. The strength training program had no effect on the subjects VO2max. However, 1 RM for knee extension and hip flexion improved by 30% and 52% respectively. More important, cycle time to exhaustion at 75% of VO2max improved a massive 33% from 26.3 minutes before strength training to 35.1 minutes after training. The conclusion: "strength training improves cycle endurance performance independently of changes in VO2max... and that this improvement appears to be related to increase in leg strength."
I don't think anyone will suggest that wieght training can substitute for time spent in the saddle, but used wisely in my opinion there is more than enough evidence to suggest that it can be beneficial to the average competitor.
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2 more cents for you.
Here's a few more cents then:
The first study you quote demonstrated that such work was only on benefit for efforts requiring fast twitch fibre recruitment but not to ECP (endurance cycling performance). The increased time to exhaustion is more likely due to the fact that the resistance group had a greater overall training load than the control group. Well duh.
The second study was conducted on untrained individuals, and just about any training will improve performance in an untrained individual. The outcomes are not relevant for trained cyclists.
Neither of these studies demonstrate weights improve ECP in trained cyclists.
I'm for doing training that is specifically going to aid cycling performance. The type and nature of events that you are targeting will dictate whether specific strength work done with weights makes sense or not.
For example, I would have some riders focussed on track TT & sprint do weights. Even then the nature of the weights performed and balance with bike training needs to be considered. Many such riders are actually better off not doing weights at and focussing their sprint work on the bike. Lots of very strong but slow track riders.
The physiological adaptations induced by real strength/weights work run counter to those required to improve ECP. e.g. it add mass for no gain in aerobic power output, increases diffusion distance for exchange of key metabolites and gases at the cellular level, reduces mitochondrial volume and does not stimulate capillary growth/density, i.e. runs counter to all things necessary to improve sustainable power.
There is a low correlation between strength, speed and endurance.
By all means do weights for other reasons but a claim they aid ECP doesn't stack up.
Nevertheless, some exercise is better than none, as was demonstrated in the 2nd study quoted.
For those that can't ride, then anything that engages a large muscle mass in an aerobically meaningful manner is preferred. Walking, jogging, running, stairs, elliptical machine (my pick), rowing machines X-C skiing etc etc