Haematological responses to repeated sprints in hypoxia across different sporting modalities.

Abstract

The aim was to determine the effects of repeated-sprint\xa0training in hypoxia on haematocrit and haemoglobin in different sporting modalities. Seventy-two\xa0participants were randomly allocated to Active-Repeated\xa0sprint in hypoxia (A-RSH, n=\xa08); Active-Repeated\xa0sprint in normoxia (A-RSN, n=\xa08); Active-Control\xa0(A-CON, n=\xa08); Team Sports-RSH\xa0(T-RSH, n=\xa08); Team Sports-RSN\xa0(T-RSN, n=\xa08); Team Sports-Control\xa0(T-CON, n=\xa08); Endurance-RSH\xa0(E-RSH, n=\xa08); Endurance-RSN\xa0(E-RSN, n=\xa08); Endurance-Control\xa0(E-CON, n=\xa08). Sessions consisted of two sets of five sprints of 10 swith recovery of 20 sbetween sprints and 10\xa0min between sets. Blood samples for haematocrit and haemoglobin concentrations were obtained before and after, and 2 weeks after cessation. Haematocrit and haemoglobin were lower for the E-RSN group following 2\xa0weeks of cessation of protocol compared with E-RSH (p\xa0=\xa00.035) and E-CON (p\xa0=\xa00.045). Haematocrit of the A-RSH group was higher compared with baseline (p\xa0=\xa00.05) and Post (p\xa0=\xa00.05). Similarly, the T-RSH group demonstrated increases in haematocrit following 2\xa0weeks of cessation compared with Post (p\xa0=\xa00.04). Repeated Sprint Training in Hypoxia had different haematological effects depending on sporting modality.