Effect of a 15% increase in preferred pedal rate on time to exhaustion during heavy exercise.

نویسندگان

  • Xavier Nesi
  • Laurent Bosquet
  • Serge Berthoin
  • Jeanne Dekerle
  • Patrick Pelayo
چکیده

The aim of this study was to evaluate the effect of a 15% increase in preferred pedal rate (PPR) on both time to exhaustion and pulmonary O(2) uptake (VO(2)) response during heavy exercise. Seven competitive cyclists underwent two constant-power tests (CPT) at a power output that theoretically requires 50% of the difference in VO(2) between the second ventilatory threshold and VO(2)max (Pdelta50). Each cyclist cycled a CPT at PPR (CPTPPR) and a CPT at +15% of PPR (CPT+15%) in a randomized order. The average PPR value was 94 +/- 4 rpm, and time to exhaustion was significantly longer in CPTPPR compared with CPT+15% (465 +/- 139 vs. 303+/- 42 s, respectively; p = 0.01). A significant decrease in VO(2) values in the first minutes of exercise and a significant increase in VO(2) slow component was reported in CPT+15% compared with CPT(PPR). These data indicate that the increase of 15% PPR was associated with a decrease in exercise tolerance and a specific VO(2) response, presumably due to an increase of negative muscular work, internal work, and an altering of motor unit recruitment patterns.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

تاثیر مصرف حاد مقادیر مختلف کافئین بر زمان رسیدن به واماندگی، سطوح استراحتی و پاسخ-های عوامل همودینامیک در مردان جوان ورزشکار

Introduction: Caffeine is the most widely consumed physiological stimulant which is consumed via natural sources, such as coffee and tea as an energetic drink and dietary supplement.  The present study was conducted to identify the effect of different doses of caffeine on time to exhaustion, resting level and cardiovascular responses in male athletes. Methods: Eight male student athletes ...

متن کامل

Effect of arginine supplementation on O2 uptake kinetics response in female taekwondo athletes

Introdiction and Aim: Nowadays, due to the epidemic of sports supplements, the effects of these supplements on athletic performance require analysis and evaluation.The aim of the present study was to investigate the effect of arginine supplementation for one week on oxygen uptake kinetics and time to exhaustion in female taekwondo athletes. Method: In this semi-experimental study with prete...

متن کامل

Effect of Branched-Chain Amino Acid Supplementation on O2 Uptake Kinetics and Time to Exhaustion in Trained Women

Objective The aim of this study was to investigate the effect of Branched-Chain Amino Acid (BCAA) supplementation on O2 uptake kinetics and the time to exhaustion in trained women.  Methods In this quasi-experimental study with pre-test/post-test design, participants were 20 trained women (Mean±SD age, 21.3±0.5 years). They were randomly assigned into two groups of BCAA (received 45mg/kg/d BCA...

متن کامل

Effect of pedal rate on primary and slow-component oxygen uptake responses during heavy-cycle exercise.

We hypothesized that a higher pedal rate (assumed to result in a greater proportional contribution of type II motor units) would be associated with an increased amplitude of the O(2) uptake (Vo(2)) slow component during heavy-cycle exercise. Ten subjects (mean +/- SD, age 26 +/- 4 yr, body mass 71.5 +/- 7.9 kg) completed a series of square-wave transitions to heavy exercise at pedal rates of 35...

متن کامل

Effect of Vitamin C Supplementation on Lipid Peroxidation and Lactate Levels in Individuals Performing Exhaustion Exercise

Background. Exercise has significant affects on free radical production. Objective. The objective of the present study was to explore the effect of vitamin C supplementation on lipid peroxidation and lactate levels in sedentary individuals who performed exhaustion exercised. Methods. 10 healthy sedentary male athletes participated to study. They were supplemented with 300 mg oral vitamin C (L...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Canadian journal of applied physiology = Revue canadienne de physiologie appliquee

دوره 29 2  شماره 

صفحات  -

تاریخ انتشار 2004