Publications by authors named "N C Kleinveldt"
Objective: To determine the association between variation in exercise load, immunoglobulin (Ig) status, and self-reported symptoms of upper respiratory tract infection (URTI) in ultramarathon runners.
Design: Longitudinal observational field study.
Setting: Four weeks before and 2 weeks after an 86.
Hematological recovery in male ultramarathon runners: the effect of variations in training load and running time.
J Sports Med Phys Fitness
September 2004
Aim: Haematological response to the 2001 downhill Comrades Marathon was compared in high (>120 km/w in training; 3 weeks of pre-race taper) and low (<80 km/w in training; 2 weeks of pre-race taper) training status groups.
Methods: Full blood counts, differential lymphocyte counts (CD3, CD4, CD8, CD19, CD56), serum cortisol, C-reactive protein (CRP) and creatine kinase (CK) were measured in blood samples donated 21 hours before and 16 hours after a 90 km ultramarathon.
Results: Despite significantly faster mean race finishing time (8.