The relative humidity was stable at 43% during the race. The ‘Bike Race Marathon MTB Rohozec’ in Liberec took place from 9th June to 10th June 2012. The course comprised a 12.6 km track with an elevation of 250 m. The track surface consisted of paved and unpaved roads and paths. There was one aid station located at the start and finish area with food and beverages similar to those mentioned above. The temperature was +19˚C at the start, rose to a maximum of +23˚C, dropped to +6˚C during the night and changed to +11˚C until

the end of the race. Weather conditions varied from sunny to cloudy with a short Z-IETD-FMK order shower in the afternoon and relative humidity increased from 44% to 98%. Procedures, measurements and calculations Participants were instructed to keep a training diary until the start of the race. The training three months before the race (i.e. training

units in hours, cycling units in hours, training distances in kilometers, cycling speed, heart rate during training units, volume of kilometers in the year 2011, and the years of active cycling) was recorded. Participant recruitment and pre-race testing took place during event registration in the morning before the race between 07:00 a.m. and 11:00 a.m. in a private room adjacent to the registration area. The athletes were informed of the procedures and gave their informed written consent. Post-race measurements were taken between 12:00 and 1:00 p.m. immediately find more upon completion of the tuclazepam race in the same place. No measurements were made during the race. Between the pre- and the post-race measurements, all athletes recorded their fluid intake using a written Momelotinib nmr record. Anthropometric measurements and plethysmography of the foot Anthropometric measurements were recorded in all forty-nine ultra-MTBers (37 males and 12 females) (Table  2, also Figure  1) to estimate skeletal muscle mass and fat mass. Body mass, total body water, extracellular fluid and intracellular fluid were measured using a multiple-frequency bioelectrical impedance analyser (InBody 720, Biospace, Seoul, South Korea). Inbody 720 has a tetra polar

8-point tactile electrode system performing at each session 30 impedance measurements by using six different frequencies (i.e. 1 kHz, 5 kHz, 50 kHz, 250 kHz, 500 kHz, and 1,000 kHz) at each five segments (i.e. right arm, left arm, trunk, right leg, and left leg). Subjects were barefoot and generally clothed in cycling attire for both the pre- and post-race measurements and participants were advised to void their urinary bladder prior to the anthropometric measurements. Body height was determined using a stadiometer (TANITA HR 001, Tanita Europe B.V., Amsterdam, The Netherland) to the nearest 0.01 m. Body mass index was calculated using body mass and body height. The circumferences of mid-upper arm, mid-thigh and mid-calf were measured on the right side of the body to the nearest 0.