Guy Thibault | Université de Montréal (original) (raw)

Papers by Guy Thibault

Sports, 2022

High-Intensity Interval Training (HIIT) is a time-efficient training method suggested to improve ... more High-Intensity Interval Training (HIIT) is a time-efficient training method suggested to improve health and fitness for the clinical population, healthy subjects, and athletes. Many parameters can impact the difficulty of HIIT sessions. This study aims to highlight and explain, through logical deductions, some limitations of the Skiba and Coggan models, widely used to prescribe HIIT sessions in cycling. We simulated 6198 different HIIT training sessions leading to exhaustion, according to the Skiba and Coggan-Modified (modification of the Coggan model with the introduction of an exhaustion criterion) models, for three fictitious athlete profiles (Time-Trialist, All-Rounder, Sprinter). The simulation revealed impossible sessions (i.e., requiring athletes to surpass their maximal power output over the exercise interval duration), characterized by a few short exercise intervals, performed in the severe and extreme intensity domains, alternating with long recovery bouts. The fraction of...

Scandinavian journal of medicine & science in sports, Jan 16, 2016

We compared the effects of submaximal and supramaximal cycling interval training on determinants ... more We compared the effects of submaximal and supramaximal cycling interval training on determinants of exercise performance in moderately endurance-trained men. Maximal oxygen consumption (VO2max ), peak power output (Ppeak ), and peak and mean anaerobic power were measured before and after 6 weeks (3 sessions/week) of submaximal (85% maximal aerobic power [MP], HIIT85 , n = 8) or supramaximal (115% MP, HIIT115 , n = 9) interval training to exhaustion in moderately endurance-trained men. High-intensity training volume was 47% lower in HIIT115 vs HIIT85 (304 ± 77 vs 571 ± 200 min; P < 0.01). Exercise training was generally associated with increased VO2max (HIIT85 : +3.3 ± 3.1 mL/kg/min; HIIT115 : +3.3 ± 3.6 ml/kg/min; Time effect P = 0.002; Group effect: P = 0.95), Ppeak (HIIT85 : +18 ± 9 W; HIIT115 : +16 ± 27 W; Time effect P = 0.045; Group effect: P = 0.49), and mean anaerobic power (HIIT85 : +0.42 ± 0.69 W/kg; HIIT115 : +0.55 ± 0.65 W/kg; Time effect P = 0.01; Group effect: P = 0....

Entrainement cardio demystifie certaines croyances repandues dans le milieu sportif et informe le... more Entrainement cardio demystifie certaines croyances repandues dans le milieu sportif et informe le lecteur sur les meilleures pratiques d'entrainement pour differentes disciplines (velo, course a pied, ski de fond, natation, triathlon et trekking).

Ce document aborde les sujets de mieux-etre et d'activites physique et du sport, des lignes d... more Ce document aborde les sujets de mieux-etre et d'activites physique et du sport, des lignes directrices, des determinants, des raisons de l'abandon et de la promotion de l'activite physique et du sport.

Le septieme avis du Comite scientifique de Kino‐Quebec porte sur la pratique reguliere d’activite... more Le septieme avis du Comite scientifique de Kino‐Quebec porte sur la pratique reguliere d’activites physiques et sportives, la condition physique et la sante des enfants et des adolescents. Vous y trouverez des elements d’information etayes de donnees fiables, de meme que des arguments et des moyens pour favoriser et faciliter l’exercice physique des jeunes du primaire et du secondaire. Cet article presente les faits saillants de cet avis.

Au cours des dernieres decennies, la condition physique des jeunes s’est a tel point deterioree q... more Au cours des dernieres decennies, la condition physique des jeunes s’est a tel point deterioree que l’on brandit, a juste titre, les risques accrus de maladies cardiovasculaires. De plus, l’obesite juvenile pose un autre probleme de sante publique important vu sa prevalence elevee et le fait que les jeunes obeses risquent fortement de devenir des adultes obeses. L’activite physique est souvent presentee comme la solution miracle a bien des maux : hypertension, diabete, obesite, etc. A-t-on raison? A la lumiere des etudes les plus recentes, le dernier avis du Comite scientifique de Kino-Quebec. L’activite physique, le sport et les jeunes – Savoir et agir, repond a la question et presente les effets averes et non averes de la pratique d’activites physiques et sportives sur la sante des jeunes.

t has often been demonstrated that greater improvements in key performance factors (anaerobic cap... more t has often been demonstrated that greater improvements in key performance factors (anaerobic capacity, maximal aerobic power [MAP] and aerobic endurance) in most of the so called ‘aerobic’ sports such as cross country, middle and long distance running can be achieved through training programmes that include intermittent sessions. In fact, as shown in Table 1, when doing continuous exercise, one cannot sustain intensity in the optimal development zone of these key performance factors for very long. It is exactly because it enables an athlete to perform a greater amount of work at a given elevated relative intensity that interval training is frequently preferred to continuous training.

Isokinetics and Exercise Science

ABSTRACT We investigated the effect on neuromuscular properties of the knee extensors of an exhau... more ABSTRACT We investigated the effect on neuromuscular properties of the knee extensors of an exhaustive cycling exercise performed at 6AM and 6PM. Eleven well trained cyclists performed a maximal aerobic exercise consisting in a sustained effort at 95% of their maximal power until exhaustion (T_{lim}). Isometric maximal voluntary contraction (MVC) and electromyographic activities (root mean square: RMS) of the vastus lateralis were recorded before (pre-test) and immediately after (post-test) the cycling exercise. The MVC/RMS ratio was calculated and used as an index of neuromuscular efficiency (NME). Rectal temperature was recorded continuously throughout the test session. Results show that T_{lim} cycling exercise was not time-of-day dependent (p=0.42). A significant interaction effect of time of day and the cycling exercise was demonstrated for MVC (p<0.02) and NME (p<0.05). In pre-test, MVC and NME were higher in the late afternoon than in the morning (+6.8%); however both parameters were more affected by the T_{lim} exercise at 6PM than at 6AM. These results suggest that following cycling T_{lim} exercise, neuromuscular properties of the knee extensors are more affected in the evening than in the morning. However, circadian rhythm of some biomechanical parameters implicated in the pedalling movement may modulate the effect of these diurnal variations.

Medicine and Science in Sports and Exercise, Dec 1, 1987

The purpose of the study was to develop an index of endurance capability [i.e., "the ability to s... more The purpose of the study was to develop an index of endurance capability [i.e., "the ability to sustain a high fractional utilization of maximal oxygen uptake (VO2max) for a prolonged period of time"]. The index was based on the linear reduction of fractional utilization of VO2max with total running time greater than 7 min plotted on a log scale. The endurance index estimated from VO2max, running efficiency and the marathon performance of 18 male runners (30 +/- 7 yr old; VO2max = 66 +/- 5 ml.kg-1.min-1) ranged between -4.07 and -9.96% VO2max.1 nt-1 (mean +/- SD = -6.40 +/- 1.50) and was not related to VO2max (r = 0.107) or speed in the marathon race (r = 0.354). However, the endurance index was closely related (r = 0.853) to the fractional utilization of VO2max at ventilatory threshold (breakaway of the excess CO2 elimination curve) which occurred at 76.1 +/- 5.5% VO2max in response to a graded treadmill test. These results indicate that: (i) running time on long distance races is not, per se, an adequate measure of endurance capability because of the major contribution of VO2max to long distance running performance; (ii) the endurance index expressed as %VO2max.1n t-1 is an objective and independent index of endurance capability; and (iii) runners with a high endurance capability tend to hyperventilate at higher relative workload during a graded treadmill test.

The Faseb Journal, Apr 1, 2014