Ingen negativ påverkan på styrka & hypertrofi av intervallcykling efter styrketräning

[King Grub]

Aim of the study was to investigate whether high-intensity interval cycling performed immediately after resistance training would inhibit muscle strength increase and hypertrophy expected from resistance training per se. Twenty-two young men were assigned into either resistance training (RE; N = 11) or resistance training plus high-intensity interval cycling (REC; N = 11). Lower body muscle strength and rate of force development (RFD), quadriceps cross-sectional area (CSA) and vastus lateralis muscle architecture, muscle fiber type composition and capillarization, and estimated aerobic capacity were evaluated before and after 8 weeks of training (2 times per week). Muscle strength and quadriceps CSA were significantly and similarly increased after both interventions. Fiber CSA increased significantly and similarly after both RE (type I: 13.6 ± 3.7%, type IIA: 17.6 ± 4.4%, type IIX: 23.2 ± 5.7%, P < 0.05) and REC (type I: 10.0 ± 2.7%, type IIA: 14.8 ± 4.3% type IIX: 20.8 ± 6.0%, P < 0.05). In contrast, RFD decreased and fascicle angle increased (P < 0.05) only after REC. Capillary density and estimated aerobic capacity increased (P < 0.05) only after REC. These results suggest that high-intensity interval cycling performed after heavy-resistance exercise may not inhibit resistance exercise-induced muscle strength/hypertrophy after 2 months of training, while it prompts aerobic capacity and muscle capillarization. The addition of high-intensity cycling after heavy-resistance exercise may decrease RFD partly due to muscle architectural changes.

Scand J Med Sci Sports. 2016 Sep 23. Effects of high-intensity interval cycling performed after resistance training on muscle strength and hypertrophy.

[Slartibartfast]

Brad Schoenfeld kommenterar studien på sin FB.

Before jumping to conclusions, some things to consider:

1. The subjects were untrained; high-intensity cycling may have thus been enough of overload stimulus to prevent anabolic interference; this might not be the case in resistance-trained individuals.

2. The duration of the routine (8 weeks) was quite short and negative effects related to overtraining would likely not have manifested at this point. A longer study duration may have shown different results.

3. The training was only carried out twice a week and thus findings can't necessarily be extrapolated to more frequent training routines.

4. Finally and interestingly, the lifting-only group showed a greater increase in vastus lateralis cross sectional area vs the concurrent group (49% vs 26%), and these increases were negatively associated with increases in capillary density. The authors speculate that the aerobic adaptations in the concurrent group may have negatively impacted hypertrophy.

That said, intriguing findings that add to our understanding of a complex topic"

[BobaFett]

Vad var det för cykling man körde? Hur såg intervallerna ut?

[broman]

Var det inte tvärt om nyss? :o