Tags

Type your tag names separated by a space and hit enter

Effects of exercise load and blood-flow restriction on skeletal muscle function.
Med Sci Sports Exerc. 2007 Oct; 39(10):1708-13.MS

Abstract

Resistance training at low loads with blood flow restriction (BFR) (also known as Kaatsu) has been shown to stimulate increases in muscle size and strength. It is unclear how occlusion pressure, exercise intensity, and occlusion duration interact, or which combination of these factors results in the most potent muscle stimulus.

PURPOSE

To determine the effect of eight BFR protocols on muscle fatigue (decrement in maximal voluntary contraction (MVC) after the performance of exercise), and to compare the decrement in MVC with the currently recommended resistance exercise intensity (~80% MVC).

METHODS

During five test sessions, 21 subjects (14 males and 7 females, 27.7 +/- 4.9 yr) completed nine protocols, each consisting of three sets of knee extensions (KE) to failure. One protocol was high-load (HL) exercise (80% MVC) with no BFR, and the other eight were BFR at varying levels of contraction intensity (20 or 40% MVC), occlusion pressure (partial (~160 mm Hg) or complete (~300 mm Hg)), and occlusion duration (off during the rest between sets or continuously applied). To evaluate each protocol, MVC were performed before and after exercise, and the decrement in force was calculated.

RESULTS

Three sets of KE at 20% MVC with continuous partial occlusion (20%(ConPar)) resulted in a greater decrement in MVC compared with HL (31 vs 19%, P = 0.001). None of the other BFR protocols were different from the HL protocol, nor were they different from 20%(ConPar) (P > 0.05).

CONCLUSION

All BFR protocols elicited at least as much fatigue as HL, even though lower loads were used. The 20%(ConPar) protocol was the only one that elicited significantly more fatigue than HL. Future research should evaluate protocol training effectiveness and overall safety of BFR exercise.

Authors+Show Affiliations

Musculoskeletal Research Laboratory, Department of Exercise Science, Syracuse University, Syracuse, NY 13244-5040, USA. slbaldwi@syr.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

17909396

Citation

Cook, Summer B., et al. "Effects of Exercise Load and Blood-flow Restriction On Skeletal Muscle Function." Medicine and Science in Sports and Exercise, vol. 39, no. 10, 2007, pp. 1708-13.
Cook SB, Clark BC, Ploutz-Snyder LL. Effects of exercise load and blood-flow restriction on skeletal muscle function. Med Sci Sports Exerc. 2007;39(10):1708-13.
Cook, S. B., Clark, B. C., & Ploutz-Snyder, L. L. (2007). Effects of exercise load and blood-flow restriction on skeletal muscle function. Medicine and Science in Sports and Exercise, 39(10), 1708-13.
Cook SB, Clark BC, Ploutz-Snyder LL. Effects of Exercise Load and Blood-flow Restriction On Skeletal Muscle Function. Med Sci Sports Exerc. 2007;39(10):1708-13. PubMed PMID: 17909396.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of exercise load and blood-flow restriction on skeletal muscle function. AU - Cook,Summer B, AU - Clark,Brian C, AU - Ploutz-Snyder,Lori L, PY - 2007/10/3/pubmed PY - 2008/1/12/medline PY - 2007/10/3/entrez SP - 1708 EP - 13 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 39 IS - 10 N2 - UNLABELLED: Resistance training at low loads with blood flow restriction (BFR) (also known as Kaatsu) has been shown to stimulate increases in muscle size and strength. It is unclear how occlusion pressure, exercise intensity, and occlusion duration interact, or which combination of these factors results in the most potent muscle stimulus. PURPOSE: To determine the effect of eight BFR protocols on muscle fatigue (decrement in maximal voluntary contraction (MVC) after the performance of exercise), and to compare the decrement in MVC with the currently recommended resistance exercise intensity (~80% MVC). METHODS: During five test sessions, 21 subjects (14 males and 7 females, 27.7 +/- 4.9 yr) completed nine protocols, each consisting of three sets of knee extensions (KE) to failure. One protocol was high-load (HL) exercise (80% MVC) with no BFR, and the other eight were BFR at varying levels of contraction intensity (20 or 40% MVC), occlusion pressure (partial (~160 mm Hg) or complete (~300 mm Hg)), and occlusion duration (off during the rest between sets or continuously applied). To evaluate each protocol, MVC were performed before and after exercise, and the decrement in force was calculated. RESULTS: Three sets of KE at 20% MVC with continuous partial occlusion (20%(ConPar)) resulted in a greater decrement in MVC compared with HL (31 vs 19%, P = 0.001). None of the other BFR protocols were different from the HL protocol, nor were they different from 20%(ConPar) (P > 0.05). CONCLUSION: All BFR protocols elicited at least as much fatigue as HL, even though lower loads were used. The 20%(ConPar) protocol was the only one that elicited significantly more fatigue than HL. Future research should evaluate protocol training effectiveness and overall safety of BFR exercise. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/17909396/Effects_of_exercise_load_and_blood_flow_restriction_on_skeletal_muscle_function_ L2 - http://dx.doi.org/10.1249/mss.0b013e31812383d6 DB - PRIME DP - Unbound Medicine ER -