Abstract
Purpose: To get information on the effort during vigorous exercise there are different ways and, the most popular, is the scale to measure subjective exertion or the rating of perceived exertion (RPE), such as the Borg scale. This scale is an effective methods to quantify and monitor the intensity of the exercise The aims of this study were to investigate the association between RPE, blood lactate concentration and maximal voluntary handgrip (MVG) force, after fatiguing exercise in athletes and non-athletes. Method: Twelve right-handed male taekwondo athletes (age: 27 ± 5 years) and 12 matched controls (age: 26 ± 5 years) were recruited. Peak force was measured and, after a subsequent rest, subjects were asked to reproduce 30% of their MVG for 4 s, then relax for 2 s, and then repeat this sequence for 10 minutes. Blood lactate was measured at rest (pre), at the end (0 min) as well as 3 and 10 min of the recovery. The RPE for the work performed were measured at the end of fatiguing handgrip exercise with Borg scale (range: 6-20). Conclusion: The results of this study show significant correlation between RPE and blood lactate peak (p<0.01), RPE and MVG post exercise (p<0.01) and between RPE and Δ blood lactate (blood lactate post-blood lactate pre; p<0.01).
Highlights
The term fatigue, in healthy subjects, refers to any exercise induced loss of ability to exert force or power with a muscle or a muscle group [1,2]
The rating of perceived exertion (RPE) for the work performed were measured at the end of fatiguing handgrip exercise with Borg scale
The maximal voluntary handgrip (MVG) measured by hand-grip transducer before fatiguing exercise, as expected was higher in athletes than in non-athletes, but there are no differences between groups
Summary
The term fatigue, in healthy subjects, refers to any exercise induced loss of ability to exert force or power with a muscle or a muscle group [1,2]. The fatigue mechanism is generally considered a complex interaction between peripheral and central factors [3]. There is evidence that reduction in pH [6] and blood flow [7] increases fatigue and that loss of homeostasis does not occur at the end of exercise [8]. Taekwondo is a marital art that had been growing in popularity even before its official inclusion in the Sydney 2000 Olympic Games. In the United States, approximately 1.5–2 million people practice martial arts [9], the most popular of which is. Athletes participate in full-sparring tournaments, in which points are awarded for punches and kicks to the head and torso [10,11]
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