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ACUTE EFFECT OF TWO AEROBIC EXERCISE MODES ON MAXIMUM STRENGTH AND STRENGTH ENDURANCE

DE SOUZA EDUARDO OLIVEIRA; TRICOLI, VALMOR; FRANCHINI, EMERSON; PAULO, ANDERSON CAETANO; REGAZZINI, MARCELO; UGRINOWITSCH, CARLOS
The Journal of Strength & Conditioning Research: November 2007
ORIGINAL RESEARCH: PDF Only

ABSTRACTThe purpose of this study was to evaluate the effects of 2 modes of aerobic exercise (continuous or intermittent) on maximum strength (1 repetition maximum, 1RM) and strength endurance (maximum repetitions at 80% of 1RM) for lower- and upper-body exercises to test the acute hypothesis in concurrent training (CT) interference. Eight physically active men (age: 26.9 ± 4.2 years; body mass: 82.1 ± 7.5 kg; height: 178.9 ± 6.0 cm) were submitted to: (a) a graded exercise test to determine JOURNAL/jscr/04.02/00124278-200711000-00053/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max (39.26 ± 6.95 ml·kg<1·min<1) and anaerobic threshold velocity (3.5 mmol·L−1) (9.3 ± 1.27 km·h−1); (b) strength tests in a rested state (control); and (c) 4 experimental sessions, at least 7 days apart. The experimental sessions consisted of a 5-kilometer run on a treadmill continuously (90% of the anaerobic threshold velocity) or intermittently (1:1 minute at JOURNAL/jscr/04.02/00124278-200711000-00053/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max). Ten minutes after the aerobic exercise, either a maximum strength or a strength endurance test was performed (leg press and bench press exercises). The order of aerobic and strength exercises followed a William's square distribution to avoid carryover effects. Results showed that only the intermittent aerobic exercise produced an acute interference effect on leg strength endurance, decreasing significantly (p < 0.05) the number of repetitions from 10.8 ± 2.5 to 8.1 ± 2.2. Maximum strength was not affected by the aerobic exercise mode. In conclusion, the acute interference hypothesis in concurrent training seems to occur when both aerobic and strength exercises produce significant peripheral fatigue in the same muscle group.

The purpose of this study was to evaluate the effects of 2 modes of aerobic exercise (continuous or intermittent) on maximum strength (1 repetition maximum, 1RM) and strength endurance (maximum repetitions at 80% of 1RM) for lower- and upper-body exercises to test the acute hypothesis in concurrent training (CT) interference. Eight physically active men (age: 26.9 ± 4.2 years; body mass: 82.1 ± 7.5 kg; height: 178.9 ± 6.0 cm) were submitted to: (a) a graded exercise test to determine JOURNAL/jscr/04.02/00124278-200711000-00053/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max (39.26 ± 6.95 ml·kg<1·min<1) and anaerobic threshold velocity (3.5 mmol·L−1) (9.3 ± 1.27 km·h−1); (b) strength tests in a rested state (control); and (c) 4 experimental sessions, at least 7 days apart. The experimental sessions consisted of a 5-kilometer run on a treadmill continuously (90% of the anaerobic threshold velocity) or intermittently (1:1 minute at JOURNAL/jscr/04.02/00124278-200711000-00053/ENTITY_OV0622/v/2017-07-20T235336Z/r/image-pngO2max). Ten minutes after the aerobic exercise, either a maximum strength or a strength endurance test was performed (leg press and bench press exercises). The order of aerobic and strength exercises followed a William's square distribution to avoid carryover effects. Results showed that only the intermittent aerobic exercise produced an acute interference effect on leg strength endurance, decreasing significantly (p < 0.05) the number of repetitions from 10.8 ± 2.5 to 8.1 ± 2.2. Maximum strength was not affected by the aerobic exercise mode. In conclusion, the acute interference hypothesis in concurrent training seems to occur when both aerobic and strength exercises produce significant peripheral fatigue in the same muscle group.

Address correspondence to Dr. Carlos Ugrinowitsch, ugrinowi@usp.br.

© 2007 National Strength and Conditioning Association