تأثير الإحماء على بعض الاستجابات البيوكيميائية و الفسيولوجية و زمن تحمل الجري في الضغط الحراري

الملخص EN

The aim of the present study was to investigate the effect of warm-up on some biochemical and physiological responses and the time of running endurance in thermal stress.

Using a random blind-design, 10 athletes participated in two trials (5 days apart).

Athletes warmed-up 20 minutes (warm-up trial) before 5 minutes of the break in either warm-up trial or without warm-up (control trial).

After a break, athletes performed an incremental running protocol on a treadmill until volitional fatigue in a laboratory (30-32°c).

Blood samples and urine were picked up from each participant after volitional fatigue.

Oral temperature and heart pulse were significantly (α < 0.05) higher post warm-up in warm-up trial.

Aldosterone hormone, creatine kinase, haematocrit and urine specific gravity were significantly higher after volitional fatigue in warm-up trail.

However, cortisol hormone and blood lactate concentration were significantly higher after volitional fatigue in control trail.

There was no statistical difference in pH urine between the two trials.

Time of running endurance was significantly longer in control trial (α < 0.05).

In conclusion, warm-up before training or race in thermal stress decreases endurance time and affects some physiological and biochemical responses.

The author recommends using decrement of time and intensity of warm-up in thermal stress.