Q&A #82 - Minimum worthwhile time for a workout; Two hard workouts on the same day

• What is the minimum duration a workout (particularly a bike) should be to be worthwhile?
• Is deliberate planning of two hard workouts on the same day (e.g. "double-threshold") an effective strategy to get a stronger training response? 

  LINKS AND RESOURCES:

• That Triathlon Show website 
• Coaching
• Training Plans
• PGC-1β is downregulated by training in human skeletal muscle: no effect of training twice every second day vs. once daily on expression of the PGC-1 family
• Skeletal muscle adaptation and performance responses to once a day versus twice every second day endurance training regimens
• Twice-a-day training improves mitochondrial efficiency, but not mitochondrial biogenesis, compared with once-daily training
• Exercise twice-a-day potentiates markers of mitochondrial biogenesis in men
• Post‐exercise carbohydrate and energy availability induce independent effects on skeletal muscle cell signalling and bone turnover: implications for training adaptation

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