Post by John A. Casler on Sept 15, 2009 8:02:54 GMT -8
This is from Jamie Carruthers as posted to SuperTraining
To visit SUPERTRAINING FORUM
health.groups.yahoo.com/group/Supertraining/?yguid=44276758
DELAYED ONSET MUSCLE SORENESS AFTER LOW-INTENSITY RESISTANCE EXERCISE WITH AND WITHOUT VASCULAR OCCLUSION
WERNBOM, M., RAASTAD, T., PAULSEN, G., NIELSEN, T.S., KOSKINEN, S., AUGUSTSSON, J.
Introduction: Strength training with low loads in combination with vascular occlusion may induce moderate to severe delayed onsetmuscle soreness (DOMS) (Wernbom et al, 2006). Because DOMS after occlusion training has been largely unreported in the literature, we decided to review DOMS data collected from two recent experiments conducted in our laboratories.
Methods: In Experiment 1, ten subjects performed three sets of dynamic unilateral knee extensions with (randomized limb) and without (contralateral limb) cuff occlusion, at a load of ~30% of 1RM. For each limb, all sets were performed to concentric torque failure.
In Experiment 2, seven subjects performed five sets of dynamic unilateral knee extensions with and without cuff occlusion, at a load of ~30% of 1RM. The occluded limb performed all sets to failure, while the non-occluded contralateral limb was matched to perform exactly the same number of repetitions in each set as the occluded limb.
In both trials, a wide cuff was used, the occlusion pressure was 90-100 mm Hg (~50-60% reduction of femoral blood flow at rest) and the pressure was maintained between sets. The inter-set rest period was 45 seconds in both trials. The number of repetitions performed per set and in total were counted as a measure of the volume of work. DOMS was rated with a 0-10 visual-analog-scale (VAS) pre and postexercise (at 0, 24, 48, 72, 96 and 120 hours).
Results: In Experiment 1, the total number of repetitions was 76 for the non-occluded limb and 53 for the occluded limb (p<0.05 for the difference in volume). The VAS-ratings peaked at 48h and reached a higher value for the non-occluded limb (5.0) than the occluded limb (3.3) (p<0.05).
In Experiment 2, the total number of repetitions was 57 for the occluded limb (and thus also for the non-occluded limb). The VAS-ratings peaked at 48h and reached a higher value for the occluded limb (6.2) than the non-occluded limb (5.3) (p<0.05).
Discussion: Both training with and without cuff occlusion resulted in DOMS and one likely explanation is that relative ischemia occurred even in the non-occluded condition (Wernbom et al, 2008). Collectively, the results indicate that both volume and the level of effort are important factors for muscle soreness induced by low-intensity ischemic strength training. Interestingly, new data suggests that the muscle activity increases not only during the concentric phase, but also during the eccentric phase as the point of torque failure draws closer, which may contribute to the DOMS (Wernbom et al, 2009). We are currently investigating muscle damage and recovery from an acute bout of occlusion training at the cellular level.
References
Wernbom M, Augustsson J, Thomee R. (2006). J Strength Cond Res, 20, 372-77.
Wernbom M, Raastad T, Augustsson J. (2008). Scand J Med Sci Sports, 18, 401-16.
Wernbom M, Augustsson J, Järrebring R, Andreasson M. (2009). J Strength Cond Res, (In press).
To visit SUPERTRAINING FORUM
health.groups.yahoo.com/group/Supertraining/?yguid=44276758
DELAYED ONSET MUSCLE SORENESS AFTER LOW-INTENSITY RESISTANCE EXERCISE WITH AND WITHOUT VASCULAR OCCLUSION
WERNBOM, M., RAASTAD, T., PAULSEN, G., NIELSEN, T.S., KOSKINEN, S., AUGUSTSSON, J.
Introduction: Strength training with low loads in combination with vascular occlusion may induce moderate to severe delayed onsetmuscle soreness (DOMS) (Wernbom et al, 2006). Because DOMS after occlusion training has been largely unreported in the literature, we decided to review DOMS data collected from two recent experiments conducted in our laboratories.
Methods: In Experiment 1, ten subjects performed three sets of dynamic unilateral knee extensions with (randomized limb) and without (contralateral limb) cuff occlusion, at a load of ~30% of 1RM. For each limb, all sets were performed to concentric torque failure.
In Experiment 2, seven subjects performed five sets of dynamic unilateral knee extensions with and without cuff occlusion, at a load of ~30% of 1RM. The occluded limb performed all sets to failure, while the non-occluded contralateral limb was matched to perform exactly the same number of repetitions in each set as the occluded limb.
In both trials, a wide cuff was used, the occlusion pressure was 90-100 mm Hg (~50-60% reduction of femoral blood flow at rest) and the pressure was maintained between sets. The inter-set rest period was 45 seconds in both trials. The number of repetitions performed per set and in total were counted as a measure of the volume of work. DOMS was rated with a 0-10 visual-analog-scale (VAS) pre and postexercise (at 0, 24, 48, 72, 96 and 120 hours).
Results: In Experiment 1, the total number of repetitions was 76 for the non-occluded limb and 53 for the occluded limb (p<0.05 for the difference in volume). The VAS-ratings peaked at 48h and reached a higher value for the non-occluded limb (5.0) than the occluded limb (3.3) (p<0.05).
In Experiment 2, the total number of repetitions was 57 for the occluded limb (and thus also for the non-occluded limb). The VAS-ratings peaked at 48h and reached a higher value for the occluded limb (6.2) than the non-occluded limb (5.3) (p<0.05).
Discussion: Both training with and without cuff occlusion resulted in DOMS and one likely explanation is that relative ischemia occurred even in the non-occluded condition (Wernbom et al, 2008). Collectively, the results indicate that both volume and the level of effort are important factors for muscle soreness induced by low-intensity ischemic strength training. Interestingly, new data suggests that the muscle activity increases not only during the concentric phase, but also during the eccentric phase as the point of torque failure draws closer, which may contribute to the DOMS (Wernbom et al, 2009). We are currently investigating muscle damage and recovery from an acute bout of occlusion training at the cellular level.
References
Wernbom M, Augustsson J, Thomee R. (2006). J Strength Cond Res, 20, 372-77.
Wernbom M, Raastad T, Augustsson J. (2008). Scand J Med Sci Sports, 18, 401-16.
Wernbom M, Augustsson J, Järrebring R, Andreasson M. (2009). J Strength Cond Res, (In press).