They have not mentioned anything related to that as they only have provided below fitness criteria -

Physical standard required for NDA 2017: Candidates appearing in NDA II 2017 must be physically and mentally fit according to the prescribed physical standards. A candidate recommended by the Services Selection Board (SSB) will undergo a medical examination by a Board of Service Medical Officers. Only those candidates will be will be declared qualified NDA II 2017 and admitted to the academy who is declared fit by the medical board. The candidate must be in good physical and mental health and free from any disease/disability which is likely to interfere with the efficient performance of Military duties. The minimum acceptable height is 157 cm for Army, Navy and Naval Academy while 162.5 cm for Air Force. For Gorkhas and individuals belonging to hills of North-Eastern the minimum acceptable heights will be 5 cm less. For more detail required physical standards candidates are advised to read the NDA II notification.

Hope this helps!!!