PubMed Health⌕ Search

Biomedical subjects

L Brassard

Publications and source records attributed to L Brassard.

9 recordsLinked to original sources
PubMed1986

The effects of an arm ergometer training programme on wheelchair subjects.

The purpose of the present investigation was to study the effects of an arm ergometer training programme on several physiological variables of recreational wheelchair subjects. Ten paraplegics (5 experimental, 5 control) were tested prior to and immediately after a 2 month exercise regimen at 80% of peak heart rate (30 min per day, 5 days per week, for 8 consecutive weeks at 50 rev/min). The results demonstrated significant increases (P less than 0.05) in VO2max (1 min-1 & ml kg-1 min-1) and workload but only mild improvements in maximal heart rate and post exercise blood lactates. Body fat, vital capacity and forced expiratory volume did not change with training. Triceps lateralis fibre distribution and fast twitch (FT) fibre area were unaffected by the endurance training programme. However, slow twitch (ST) fibre area increased (P less than 0.05) with training. The results indicate that physiological variables of paraplegic subjects following an arm ergometer endurance training programme react similarly to changes previously observed in non-handicapped subjects. The values when compared with normals are low as a result of the relative inactivity of the subjects due to the lack of available exercise programmes for wheelchair people.

Adolescent↗
PubMed1982

Enzyme activities and reduced insulin need with training in streptozotocin-induced diabetic rats.

Following a 12-week endurance training program, the SDH activities of gastrocnemius medialis muscle of streptozotocin-induced diabetic animals increased by 50%. On the other hand, a 14% decrease was observed in the same muscle of diabetic animals submitted to power training. No difference between groups, for soleus and gastrocnemius lateralis muscles following the two different training regimens was observed. It can be concluded that streptozotocin-induced diabetic animals controlled by daily insulin demonstrate a normal muscle enzyme adaptation to exercise. These data also demonstrate that regular power and/or endurance exercise can result in reduced exogenous insulin need in streptozotocin-induced diabetic rats (18% and 28% respectively), suggesting a more efficient membrane transport of glucose with induced exercise, and a decreased need for insulin supported transport.

Animals↗
PubMed1980

Backward extrapolation of VO2max values from the O2 recovery curve.

The purpose of this study was to validate a method for measuring Vo2max in field conditions. In order to do so, Vo2max obtained by backward extrapolation of the O2 recovery curve at time zero of recovery (BE), was compared to the Vo2max measured directly at the end of a continuous multistage test (Exercise). The optimal way to determine Vo2max was by using a single component exponential least-squares regression on the first three or four 20 x recovery values. When a three-way valve was used to collect expired air immediately at the start of recovery (n=20), BE Vo2max (X- +/- SD=56.5 +/- 7.4 ML KG-1 MIN-1) WAS NOT SIGNIFICANTLY DIFFERENT FROM Exercise Vo2max (56.1 +/- 7.6). When subjects (n=16) connected themselves to another breathing valve immediately at the end of the test to simulate field conditions BE and Exercise Vo2max were similar (63.9 +/- 6.7 and 63.1 +/- 7.0, respectively) as long as a 3 s correction was made for the delay caused by this procedure. BE and Exercise Vo2max were 59.8 +/- 8 and 59.2 +/- 8.1 for the 36 subjects; the Pearson's correlation coefficient was 0.92. BE Vo2max measured on 11 additional runners tested on a track (62.6 +/- 13) yielded similar results as Exercise Vo2max measured on the treadmill using the same protocol (61.2 +/- 13.3). The backward extrapolation method appears to be valid to measure Vo2max when the air collecting equipment might otherwise be cumubersome during actual sport and/or laboratory conditions.

Female↗
PubMed1979

Comparsions among VO2 max values for hockey players and runners.

This study was designed to investigate the specificity of the VO2 max response of runners and hockey players for multistage tests done on the treadmill (RUN) or on the ice, skating a shuttle 20m course with (20m+) or without equipment (20m-) and a 140m oval course (140m-). Hockey players VO2 max in ml.kg-1.min-1 (n=10) were similar for the 4 tests (RUN: X +/- SD = 61.4 +/- 6.3; 140m-: 62.1 +/- 9.4; 20m-: 58.6 +/- 6.4; and 20m+: 59.9 +/- 7.4). VO2 max of runners (n = 10) were superior on the treadmill (68.6 +/- 4.5) as compared to the ice (140m-: 65.6 +/- 5.4). Hockey players as compared to runners, were 15% more efficient on the ice and 7.9% less efficient on the treadmill. The equipment increased the energy cost of skating by 4.8% and decreased the multistage test time by 20.3%. The low temperature arena as compared to the standard temperature laboratory, yielded lower heart rate response with multistage tests. Blood lactates (mg%) were similar for all tests done with hockey players (RUN: 128.3 +/- 19.3; 140m-: 126.8 +/- 14.7; 20m-: 133.0 +/- 17.5; and 20m+: 131.4 +/- 18.5), but lower on the ice (140m-: 87.7 +/- 15.9) as compared to the treadmill (127.2 +/- 26.4) for the runners. Maximal skating speed disclosed a relatively homogenous group of hockey players but their VO2 max scores were more widely distributed.

Adult↗
PubMed1979

A physiological profile of Canadian Greco-Roman wrestlers.

The sport of Greco-Roman wrestling is relatively new in North America. However, this is the national sport of seven European countries and a great deal of research literature is available. The purpose of the present investigation was to establish baseline data for Canadian Greco-Roman wrestlers for a data bank which can be used to compare with World Class wrestlers. The results indicate that the Canadian National Team is made up of athletes with only average values for the physiological measures taken. However, the correlation between wrestling success and the physiological parameters measured is 0.91.

Adult↗