Exercise in People With Systemic Sclerosis

12-week exercise programme. The estimated session's duration of 55 minutes. For the prescription of high intensity interval training (HIIT) and the collection of individualised peak power output (PPO) a baseline peak oxygen uptake on an arm crank ergometer will be performed. Each session will consist of 5 minutes warm up performing light to moderate intensity arm cranking (55-65% PPO), 30-minutes' high intensity interval training (HIIT; 30s 100% PPO/ 30s passive recovery) on an arm crank ergometer. The HIIT protocol will be combined with resistance training (RT) lasting for a total of 15 min.The intensity will be at 75-80% of one repetition maximum. Following each exercise session, patients will undertake a 5 min cool-down period.