Article

The loss of lean muscle mass and muscle strength is a common problem in
chronic heart failure (CHF) patients. Endurance training is efficient in
improving patient exercise capacity. This study sought to evaluate the additional
effects of strength training on muscle strength and body composition in chf
patients participating in an interval training program. METHODS: Twenty
consecutive, stable CHF patients participated in a rehabilitation program.
Subjects were randomly assigned to aerobic (n = 10) or combined aerobic plus
strength training group (n = 10). Aerobic group performed interval training on
cycle ergometers. Strength training incorporated exercises for various muscle
groups, including quadriceps, hamstrings, biceps brachii, and the deltoids. Both
regimes were of the same duration. Body composition was evaluated by whole-body
dual energy x-ray absorptiometry and quadriceps strength by the sum of the
2-repetition maximum (2-RM) test for each leg. Peak oxygen uptake (.VO(2peak))
and peak work load (W(peak)) as well as oxygen uptake (.VO(2AT)) and workload at
anaerobic threshold (W(AT)) were evaluated by a symptom limited cardiopulmonary
exercise testing. RESULTS: Concerning leg lean mass, no significant
within-subjects or between-groups changes were observed (P > .05). Both groups
improved in 2-RM test (P < .05), while a significant difference was observed
between groups (P < .05). .VO(2peak) and .VO(2AT) and W(peak) and W(AT) were
equally improved between training groups (P < .05). CONCLUSIONS: Combined aerobic
interval and strength training induces a greater benefit than interval training
alone on muscle strength in CHF patients. Adaptations other than hypertrophy,
such as muscle fiber type alterations and/or neuromuscular adjustments, may
account for these results.

Langue : ANGLAIS

Tiré à part : OUI