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Biomedical subjects

P D Campagna

Publications and source records attributed to P D Campagna.

5 recordsLinked to original sources
PubMed1995

Hemodynamics during a machine-aided flexibility protocol.

Heart rates and systolic and diastolic blood pressures of 15 subjects were measured before, during, and after a series of four proprioceptive neuromuscular facilitation (PNF) flexibility exercises. The protocol for the study involved the use of two new machines, one designed to increase flexibility of the erector spinae, the other the hamstrings. Each machine provided constant feedback of isometric force, angular displacements, time of contraction, repetitions, and other exercise variables. Each bout of exercise involved an isometric contraction of the lengthened agonist muscle group (12 sec) followed by a concentric contraction of its antagonist in order to place the body part in a more stretched position. Hemodynamic measurements were determined at both a perceived maximal voluntary isometric contraction (MVIC) and at 50% MVIC. Significant increases in hemodynamic factors were observed when exercise measures were compared to pre- and postexercise (resting) values. Higher values, though not significantly so, were found at MVIC than at 50% MVIC on both machines. All values were well within the guidelines of the American College of Sports Medicine.

Adolescent↗
PubMed1995

Substrate and hormonal responses during exercise classes at selected stages of pregnancy.

This study examined the substrate and hormonal responses during exercise classes for 36 pregnant women at selected stages of pregnancy. Six nonpregnant women served as controls. Blood samples were obtained before exercise, at the end of aerobic exercise, and 45 min after aerobic exercise. All samples were analyzed for substrates (glucose, lactate, FFA) and 7 hormones. Heart rates in the pregnant women were approximately 150 bpm, although some were as high as 180 bpm. Heart rates in the control group were approximately 130 bpm. Modest increments occurred in lactate and FFA during exercise, and decrements in glucose were observed in all groups. Insulin concentrations decreased with exercise and remained depressed after exercise whereas FFA remained elevated postexercise in the pregnant women. Modest transient changes were observed with exercise in the other hormones. A severely blunted norepinephrine response to exercise was observed in the third-trimester group. In conclusion, uncontrolled non-steady-state exercise does not disrupt the substrate and endocrine milieu markedly. Recovery in hormonal and substrate concentrations appears to occur rapidly after exercise. However, decrements in blood glucose do occur for a short time during prenatal exercise classes, most notably for women in the third trimester.

Adult↗
PubMed1993

The effects of periodized velocity-specific resistance training on maximal and sustained force production in women.

The purpose of this study was to assess the effects of slow, fast or periodized slow and fast resistance training on voluntary, maximal and sustained force production. Altogether, 34 active females were pre-tested for maximal force production (MXF) and 20-repetition mean force production (MNF) at 1.05 and 3.14 rad s-1 (60 and 180 deg s-1). They were then randomly placed into one of four groups: group S trained for 8 weeks at 1.05 rad s-1, group F trained for 8 weeks at 3.14 rad s-1, group P trained for 5 weeks at 1.05 rad s-1 and 3 weeks at 3.14 rad s-1, while group C acted as the controls. Groups S, F and P demonstrated significant increases in MXF and MNF at 1.05 and 3.14 rad s-1. The increases in MXF were similar between the trained groups, whereas groups S and P demonstrated significantly greater increases in MNF than group F at 1.05 rad s-1 and group P exhibited significantly greater increases in MNF than group S at 3.14 rad s-1. These results suggest that, regardless of training velocity, similar increases in MXF are produced at 1.05 and 3.14 rad s-1, whereas periodized slow and fast resistance training may produce greater increases in MNF than slow or fast training alone.

Adaptation, Physiological↗
PubMed1980

Small-animal ergometer.

A continuous vertical ladder ergometer for small animals has been developed. This device, operating at a (variable) downward velocity, obliges the subject animal to climb continuously, thus imposing a steady quantifiable work rate or power output. The power output of the animal is given simply by P = W X V X 9.80 X 10(-3) sin theta, where P is the power output in watts, W the animals' weight in grams, V the ladder velocity in meters per second, and theta the angle between horizontal and the ladder surface. Wistar rats have been readily taught to climb on the ergometer and demonstrate high levels of physical effort with no injuries. Rats of 350 g body wt are able to climb at 0.25 m/s for period of 15 min. The maximal power output of rats varies between 0.5 and 1.1 W. The ergometer design is compatible with conditioning and exercise programs for small animals as well as with quantitative measurements of power output and physiological parameters such as heart rate and gas exchange.

Animals↗